Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2026.01.011
Jiapeng Yuan , Minggang Zheng , Fengmei Wang , Yiling Li , Aifeng Liu , Xinyu Li , Yitong Liu , Lei Shi , Ling Wang
Bisphenol A (BPA), a widely used chemical and known endocrine-disrupting chemical (EDC), has estrogen activity and the ability to migrate over long distances, which could pose a potential threat to polar ecosystems. This study examines the pollution levels, degradation mechanisms, and ecological risks of BPA and its analogs in the southeastern Arctic Ocean, focusing on the East Siberian and Chukchi Seas, through systematic sampling and analysis of seawater, suspended particulate matter (SPM), and sediment cores collected during the 2023 Arctic scientific cruise. BPA concentrations in surface seawater ranged from below the detection limit to 23.19 ng/L, with higher levels near the Beaufort Gyre. BPA levels in SPM (106.72–2864.50 ng/g dw) were significantly higher than in sediments (10.06–70.49 ng/g dw), identifying SPM as a primary transport vector. Sediment core analysis showed a historical rise in BPA deposition since the 1950s, aligning with the growth of BPA production industries. Ecological risk assessments using Risk Quotient (RQ) values indicated a high risk to marine organisms under current conditions, although lower-trophic-level species, such as Daphnia magna, showed increased vulnerability. This work offers essential data for understanding BPA's environmental fate in the Arctic Ocean and highlights the need for long-term monitoring and interdisciplinary research to address the ongoing presence and ecological risks of BPA amid its increasing global use.
{"title":"Multimedia distribution and ecological risks of bisphenol a in the Arctic Ocean: Insights from the east Siberian and Chukchi seas","authors":"Jiapeng Yuan , Minggang Zheng , Fengmei Wang , Yiling Li , Aifeng Liu , Xinyu Li , Yitong Liu , Lei Shi , Ling Wang","doi":"10.1016/j.enceco.2026.01.011","DOIUrl":"10.1016/j.enceco.2026.01.011","url":null,"abstract":"<div><div>Bisphenol A (BPA), a widely used chemical and known endocrine-disrupting chemical (EDC), has estrogen activity and the ability to migrate over long distances, which could pose a potential threat to polar ecosystems. This study examines the pollution levels, degradation mechanisms, and ecological risks of BPA and its analogs in the southeastern Arctic Ocean, focusing on the East Siberian and Chukchi Seas, through systematic sampling and analysis of seawater, suspended particulate matter (SPM), and sediment cores collected during the 2023 Arctic scientific cruise. BPA concentrations in surface seawater ranged from below the detection limit to 23.19 ng/L, with higher levels near the Beaufort Gyre. BPA levels in SPM (106.72–2864.50 ng/g dw) were significantly higher than in sediments (10.06–70.49 ng/g dw), identifying SPM as a primary transport vector. Sediment core analysis showed a historical rise in BPA deposition since the 1950s, aligning with the growth of BPA production industries. Ecological risk assessments using Risk Quotient (RQ) values indicated a high risk to marine organisms under current conditions, although lower-trophic-level species, such as <em>Daphnia magna</em>, showed increased vulnerability. This work offers essential data for understanding BPA's environmental fate in the Arctic Ocean and highlights the need for long-term monitoring and interdisciplinary research to address the ongoing presence and ecological risks of BPA amid its increasing global use.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 986-996"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2026.01.001
Yongzhong Lai , Jiezhang Mo , Li Xiang , Zhao Lin , Zhipeng Huang , Hongzhi Zhao , Ran Bi , Wenhua Liu , Jingchun Shi , Ming Hung Wong
Industrial agglomeration in watersheds poses a significant challenge for accurately identifying pollution sources and effective environmental management. This study focused on a representative watershed hosting two world‑leading industrial centers: textile dyeing and printing, and e-waste recycling. Surface sediments were collected along the mainstream and tributaries, namely Beigang, Old Lianjiang, Chendian, Jinxi, Qiufeng, Xiashan, and Zhonggang rivers. Concentrations of hazardous elements (e.g., Cu, Sb, Cd, Pb, Hg, As) were quantified. The potential ecological risk index (RI) indicated that over 50 % of sampling sites posed high or extreme ecological risk, primarily associated with zones of intensive e-waste recycling and textile industrial discharge. We employed a combination of models with different principles to accurately apportion sources, including positive matrix factorization (PMF), principal component analysis (PCA), and correlation analysis. Results revealed that anthropogenic sources—e-waste recycling activities (characterized by Cu), textile wastewater (characterized by Sb), and urban non-point source pollution—were the dominant contributors, accounting for up to 70 % of the pollutant loads. The source profiles were further validated by comparing them with typical sludge samples from industrial facilities, confirming the distinct chemical fingerprints of each source. Notably, a cost-effectiveness analysis underscored the unsustainability of this development model: 0.48 USD per 1 USD of industrial added value were generated in latent environmental debt, primarily from ecosystem service degradation and remediation costs. This study provides a robust framework for source apportionment in complex industrial basins. It highlights the urgent need for targeted pollution control strategies in high-risk industries to mitigate environmental and economic losses.
{"title":"Assessment of sustainable development based on source apportionment of hazardous elements and cost-effectiveness analysis in a watershed hosting two world-class industrial clusters","authors":"Yongzhong Lai , Jiezhang Mo , Li Xiang , Zhao Lin , Zhipeng Huang , Hongzhi Zhao , Ran Bi , Wenhua Liu , Jingchun Shi , Ming Hung Wong","doi":"10.1016/j.enceco.2026.01.001","DOIUrl":"10.1016/j.enceco.2026.01.001","url":null,"abstract":"<div><div>Industrial agglomeration in watersheds poses a significant challenge for accurately identifying pollution sources and effective environmental management. This study focused on a representative watershed hosting two world‑leading industrial centers: textile dyeing and printing, and e-waste recycling. Surface sediments were collected along the mainstream and tributaries, namely Beigang, Old Lianjiang, Chendian, Jinxi, Qiufeng, Xiashan, and Zhonggang rivers. Concentrations of hazardous elements (e.g., Cu, Sb, Cd, Pb, Hg, As) were quantified. The potential ecological risk index (RI) indicated that over 50 % of sampling sites posed high or extreme ecological risk, primarily associated with zones of intensive e-waste recycling and textile industrial discharge. We employed a combination of models with different principles to accurately apportion sources, including positive matrix factorization (PMF), principal component analysis (PCA), and correlation analysis. Results revealed that anthropogenic sources—e-waste recycling activities (characterized by Cu), textile wastewater (characterized by Sb), and urban non-point source pollution—were the dominant contributors, accounting for up to 70 % of the pollutant loads. The source profiles were further validated by comparing them with typical sludge samples from industrial facilities, confirming the distinct chemical fingerprints of each source. Notably, a cost-effectiveness analysis underscored the unsustainability of this development model: 0.48 USD per 1 USD of industrial added value were generated in latent environmental debt, primarily from ecosystem service degradation and remediation costs. This study provides a robust framework for source apportionment in complex industrial basins. It highlights the urgent need for targeted pollution control strategies in high-risk industries to mitigate environmental and economic losses.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 857-865"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145976512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2025.12.022
Xiaohan Yin , Yijing Yang , Jianqiang Su , Yue Wu , Yuxuan Huang , Yongyu Li , Xinhong Wang
Pharmaceuticals and antibiotic resistance genes (ARGs) are increasingly recognized as emerging pollutants in coastal ecosystems, yet their contrasting behaviors in open straits versus semi-enclosed bays remain poorly understood. Here, we determined their concentrations across various sampling sites and seasons, together with mobile genetic elements (MGEs), in different water layers of the western Taiwan Strait and Dongshan Bay. In the Taiwan Strait, pharmaceutical concentrations were relatively low (0.60–81.20 ng/L), yet ocean currents may have played a pivotal role in redistributing both chemical and genetic pollutants. Despite the absence of corresponding antibiotics, multiple ARG classes (multidrug, aminoglycoside, MLSB) persisted, with strong correlations to transposase genes, underscoring the overlooked role of offshore waters as active reservoirs for horizontal gene transfer. In sharp contrast, Dongshan Bay—especially intensive aquaculture zones—exhibited substantially higher pharmaceutical levels (29.34–174.52 ng/L) and 74 ARGs dominated by multidrug resistance. Integrons (intI1) were tightly linked to diverse ARG classes, and ARG abundance correlated positively with antibiotic concentrations, directly implicating mariculture and terrestrial inputs as key drivers of resistance enrichment. Collectively, our findings reveal that semi-enclosed bays are vulnerable accumulators of anthropogenic contamination, while offshore straits serve as active pathways for pollutant redistribution and resistance propagation.
{"title":"A semi-enclosed bay as a pharmaceutical hotspot and an open strait as a regional reservoir: Contrasting pharmaceuticals and antibiotic resistance","authors":"Xiaohan Yin , Yijing Yang , Jianqiang Su , Yue Wu , Yuxuan Huang , Yongyu Li , Xinhong Wang","doi":"10.1016/j.enceco.2025.12.022","DOIUrl":"10.1016/j.enceco.2025.12.022","url":null,"abstract":"<div><div>Pharmaceuticals and antibiotic resistance genes (ARGs) are increasingly recognized as emerging pollutants in coastal ecosystems, yet their contrasting behaviors in open straits versus semi-enclosed bays remain poorly understood. Here, we determined their concentrations across various sampling sites and seasons, together with mobile genetic elements (MGEs), in different water layers of the western Taiwan Strait and Dongshan Bay. In the Taiwan Strait, pharmaceutical concentrations were relatively low (0.60–81.20 ng/L), yet ocean currents may have played a pivotal role in redistributing both chemical and genetic pollutants. Despite the absence of corresponding antibiotics, multiple ARG classes (multidrug, aminoglycoside, MLSB) persisted, with strong correlations to transposase genes, underscoring the overlooked role of offshore waters as active reservoirs for horizontal gene transfer. In sharp contrast, Dongshan Bay—especially intensive aquaculture zones—exhibited substantially higher pharmaceutical levels (29.34–174.52 ng/L) and 74 ARGs dominated by multidrug resistance. Integrons (<em>intI1</em>) were tightly linked to diverse ARG classes, and ARG abundance correlated positively with antibiotic concentrations, directly implicating mariculture and terrestrial inputs as key drivers of resistance enrichment. Collectively, our findings reveal that semi-enclosed bays are vulnerable accumulators of anthropogenic contamination, while offshore straits serve as active pathways for pollutant redistribution and resistance propagation.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 738-748"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145883809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2025.12.030
Zipei Dong , Wen-Xiong Wang
Micro(nano)plastic (MNP) pollution in the ocean raises concerns about their ecological risks. This study investigated the responses of gut and fecal microbiomes of a marine copepod Calanus sinicus to MNP exposure. Using aggregation-induced emission luminogen bacterial probes, we first visualized and quantified the bacterial distribution and abundance changes in copepod gut and fecal pellets following 200 μg/L of MP (5 μm) and NP (50 nm) exposure. Results revealed bacterial colonization in the anterior midgut, but MNPs induced significant increase in gut bacteria with a shift in gut/fecal balance. Specifically, the average fluorescence intensity of gut bacterial clusters increased by 51.8 % and 74.4 %, and conversely fecal bacterial abundance reduced by 41.4 % and 52.0 %, upon MP and NP exposure, respectively. Metagenomic sequencing revealed that MNP exposure resulted in reduced community diversity of fecal microbiome, characterized by decreased core groups and enriched plastic-associated genera. The most abundant Pseudophaeobacter decreased by 18.7–20.5 % under MNP exposure. Short-term MNP exposure had no major impact on KEGG pathways and CAZy classes, but significantly upregulated the MNP degradation-related functions, also disrupted the key genes involved in metabolism, oxidative stress, and biofilm formation. These findings provide key insights for the disturbance posed by MNPs to copepod guts and fecal microbiota.
{"title":"Gut and fecal microbial community responses of a marine copepod to micro(nano)plastics","authors":"Zipei Dong , Wen-Xiong Wang","doi":"10.1016/j.enceco.2025.12.030","DOIUrl":"10.1016/j.enceco.2025.12.030","url":null,"abstract":"<div><div>Micro(nano)plastic (MNP) pollution in the ocean raises concerns about their ecological risks. This study investigated the responses of gut and fecal microbiomes of a marine copepod <em>Calanus sinicus</em> to MNP exposure. Using aggregation-induced emission luminogen bacterial probes, we first visualized and quantified the bacterial distribution and abundance changes in copepod gut and fecal pellets following 200 μg/L of MP (5 μm) and NP (50 nm) exposure. Results revealed bacterial colonization in the anterior midgut, but MNPs induced significant increase in gut bacteria with a shift in gut/fecal balance. Specifically, the average fluorescence intensity of gut bacterial clusters increased by 51.8 % and 74.4 %, and conversely fecal bacterial abundance reduced by 41.4 % and 52.0 %, upon MP and NP exposure, respectively. Metagenomic sequencing revealed that MNP exposure resulted in reduced community diversity of fecal microbiome, characterized by decreased core groups and enriched plastic-associated genera. The most abundant <em>Pseudophaeobacter</em> decreased by 18.7–20.5 % under MNP exposure. Short-term MNP exposure had no major impact on KEGG pathways and CAZy classes, but significantly upregulated the MNP degradation-related functions, also disrupted the key genes involved in metabolism, oxidative stress, and biofilm formation. These findings provide key insights for the disturbance posed by MNPs to copepod guts and fecal microbiota.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 760-769"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2025.12.026
Marina Aliste , Caridad Ros , Isabel Garrido , Carmen María Martínez , Adriana Fuensanta Esteban , María Ángeles Hernández , Fulgencio Contreras , Pilar Flores , Pilar Hellín , José Fenoll
The dual use of rotation crops for suppressing Meloidogyne incognita (M. incognita) and their residues as organic matter amendments for pesticide remediation via biosolarization was investigated. Four plant species (mustard, radish, red clover, and sorghum) were evaluated for their response to M. incognita under controlled conditions using clay loam soil, with pepper as a susceptible control. Radish and sorghum exhibited low gall index and reproduction factor, indicating potential resistance or tolerance to root-knot nematodes (RKN). Fresh residues of these four species were also incorporated into historically contaminated agricultural soil at 5 % and 10 % (w/w) rates and subjected to biosolarization for 90 days under polyethylene covers. Soil temperature and physicochemical properties were monitored, and pesticide dissipation was assessed over time. In this soil, 15 pesticides were detected, with a cumulative concentration of 2.6 mg kg−1. Biosolarization treatments enhanced pesticide dissipation compared to solarization alone and untreated control, with half-lives ranging from 52 to 120 days. Amendment type and rate influenced degradation efficiency, with low C/N ratio residues (mustard, radish, red clover) showing greater enhancement than high C/N ratio (sorghum). Higher amendment rates (10 % w/w) of radish and red clover significantly improved dissipation. In contrast to previous biosolarization studies that focused primarily on pathogen or pesticide control using conventional organic matter amendments (e.g., composts, manures, or agro-industrial wastes), this study demonstrates the use of rotation crop residues (selected for their nematode-suppressive potential) as functional biosolarization amendments. This integrated strategy links biological pest management with pesticide remediation, advancing the concept of biosolarization toward a more holistic and sustainable soil health approach.
{"title":"Dual benefits of rotation crops: Root nematode suppression and pesticide remediation through biosolarization","authors":"Marina Aliste , Caridad Ros , Isabel Garrido , Carmen María Martínez , Adriana Fuensanta Esteban , María Ángeles Hernández , Fulgencio Contreras , Pilar Flores , Pilar Hellín , José Fenoll","doi":"10.1016/j.enceco.2025.12.026","DOIUrl":"10.1016/j.enceco.2025.12.026","url":null,"abstract":"<div><div>The dual use of rotation crops for suppressing <em>Meloidogyne incognita</em> (<em>M. incognita)</em> and their residues as organic matter amendments for pesticide remediation via biosolarization was investigated. Four plant species (mustard, radish, red clover, and sorghum) were evaluated for their response to <em>M. incognita</em> under controlled conditions using clay loam soil, with pepper as a susceptible control. Radish and sorghum exhibited low gall index and reproduction factor, indicating potential resistance or tolerance to root-knot nematodes (RKN). Fresh residues of these four species were also incorporated into historically contaminated agricultural soil at 5 % and 10 % (<em>w</em>/w) rates and subjected to biosolarization for 90 days under polyethylene covers. Soil temperature and physicochemical properties were monitored, and pesticide dissipation was assessed over time. In this soil, 15 pesticides were detected, with a cumulative concentration of 2.6 mg kg<sup>−1</sup>. Biosolarization treatments enhanced pesticide dissipation compared to solarization alone and untreated control, with half-lives ranging from 52 to 120 days. Amendment type and rate influenced degradation efficiency, with low C/N ratio residues (mustard, radish, red clover) showing greater enhancement than high C/N ratio (sorghum). Higher amendment rates (10 % <em>w</em>/w) of radish and red clover significantly improved dissipation. In contrast to previous biosolarization studies that focused primarily on pathogen or pesticide control using conventional organic matter amendments (e.g., composts, manures, or agro-industrial wastes), this study demonstrates the use of rotation crop residues (selected for their nematode-suppressive potential) as functional biosolarization amendments. This integrated strategy links biological pest management with pesticide remediation, advancing the concept of biosolarization toward a more holistic and sustainable soil health approach.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 770-779"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01DOI: 10.1016/j.enceco.2026.01.002
Manyun Zhang , Negar Omidvar , Fang Wang , Xinhong Gan , Jinfei Wu , Ning Li , Wenyuan Zhang , Tao Guo
Unreasonable mining and excavation of rare earth caused considerable threats to agricultural production and local ecology. This study explored the optimized combination of chemical leaching, phytoremediation, organic amendment and nitrification inhibitors to decline lead (Pb) contents in mining-affected soils but to enhance soil ecosystem multifunctionality. In comparison to control (CK) in the citric acid-leaching group, soil available Pb contents were significantly decreased by 15.7%, 17.5% and 18.4% in the ryegrass + camellia shell (RS), ryegrass + camellia shell + nitrification inhibitor dicyandiamide (RSDC) and ryegrass + camellia shell + nitrification inhibitor 3, 4-dimethylpyrazole phosphate (RSDM) treatments, respectively. Meanwhile, soil Firmicute ratios of the RS, RSDC and RSDM treatments were higher than those in the CK treatments, indicating that an increase in soil Firmicute ratio could improve soil health. Co-presences of shell and nitrification inhibitor significantly increased the height and weight of ryegrass in the double-distilled water and citric acid-leaching groups, and they also promoted soil ecosystem multifunctionality notably. Although the ryegrass did not survive in the citric acid and EDTA-2Na + citric acid-leaching groups, the shell amendment and nitrification inhibitor additions notably improved soil Shannon diversity indices and biotic community network stabilities. Soil pH, β-glucosidase, urease, microbial community diversity, Firmicute and Actinobacteriota ratios were negatively related to soil available Pb contents. Our study indicated that the combination of citric acid-leaching + ryegrass + organic shell + DCD was an optimal strategy for decreasing heavy metal risks and enhancing soil ecosystem health in abandoned mining areas.
{"title":"Comprehensive chemical leaching, phytoremediation, organic amendment and nitrification inhibitor enhancing tailing soil remediation and ecosystem multifunctionality","authors":"Manyun Zhang , Negar Omidvar , Fang Wang , Xinhong Gan , Jinfei Wu , Ning Li , Wenyuan Zhang , Tao Guo","doi":"10.1016/j.enceco.2026.01.002","DOIUrl":"10.1016/j.enceco.2026.01.002","url":null,"abstract":"<div><div>Unreasonable mining and excavation of rare earth caused considerable threats to agricultural production and local ecology. This study explored the optimized combination of chemical leaching, phytoremediation, organic amendment and nitrification inhibitors to decline lead (Pb) contents in mining-affected soils but to enhance soil ecosystem multifunctionality. In comparison to control (CK) in the citric acid-leaching group, soil available Pb contents were significantly decreased by 15.7%, 17.5% and 18.4% in the ryegrass + <em>camellia</em> shell (RS), ryegrass + <em>camellia</em> shell + nitrification inhibitor dicyandiamide (RSDC) and ryegrass + <em>camellia</em> shell + nitrification inhibitor 3, 4-dimethylpyrazole phosphate (RSDM) treatments, respectively. Meanwhile, soil <em>Firmicute</em> ratios of the RS, RSDC and RSDM treatments were higher than those in the CK treatments, indicating that an increase in soil <em>Firmicute</em> ratio could improve soil health. Co-presences of shell and nitrification inhibitor significantly increased the height and weight of ryegrass in the double-distilled water and citric acid-leaching groups, and they also promoted soil ecosystem multifunctionality notably. Although the ryegrass did not survive in the citric acid and EDTA-2Na + citric acid-leaching groups, the shell amendment and nitrification inhibitor additions notably improved soil Shannon diversity indices and biotic community network stabilities. Soil pH, β-glucosidase, urease, microbial community diversity, <em>Firmicute</em> and <em>Actinobacteriota</em> ratios were negatively related to soil available Pb contents. Our study indicated that the combination of citric acid-leaching + ryegrass + organic shell + DCD was an optimal strategy for decreasing heavy metal risks and enhancing soil ecosystem health in abandoned mining areas.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 1015-1032"},"PeriodicalIF":8.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-20DOI: 10.1016/j.enceco.2025.12.015
Yuxin Xu , Zirui Zhang , Xulin Zhang , Jiajia Zhu , Rui Zeng , Wending Li , Xuedan Xu , Lulu Wang , Pinpin Long , Tao Jing , Tangchun Wu , Yu Yuan
Synthetic phenolic antioxidants (SPAs), recognized as contaminants of emerging concern, have been implicated in potential adverse health outcomes. Nevertheless, their epigenetic effects, particularly on plasma microRNAs (miRNAs) in humans, remain poorly characterized. This study aimed to investigate the associations between urinary concentrations of SPAs and plasma miRNA profiles, and further explore their potential biological functions. We quantified nine urinary SPAs in 142 Chinese adults by ultraperformance liquid chromatography-tandem mass spectrometry. Multivariate linear regression was employed to assess single-chemical relation, while multi-chemical associations were evaluated using two-way orthogonal partial least-squares analysis and weighted quantile sum regression. To explore the potential origin of SPA-related plasma miRNAs, we analyzed associations between miRNA levels in plasma and leukocytes. Leveraging leukocyte mRNA sequencing data and public databases, we performed pathway enrichment analysis to identify the pathways associated with SPA-associated miRNAs. We found that urinary 4-tert-Octylphenol and 2,6-di-tert-butyl-4-hydroxy-4-methyl-2,5-cyclohexadienone were significantly associated with 2 and 7 plasma miRNAs, respectively (False discovery rate < 0.10). Furthermore, mixed exposure to SPAs was associated with five miRNAs (miR-3135b, miR-769-5p, miR-548k, miR-3188, miR-7705) in both two models. Notably, miR-769-5p and miR-3135b demonstrated consistent associations across all analytical approaches. The positive associations between plasma levels of miR-769-5p, miR-548k, and miR-3188 and their corresponding intra-leukocyte levels (P < 0.05) suggested that leukocytes might serve as a potential source of these miRNAs. Functional analyses identified that SPA-related miRNAs were involved in pathways related to neurotoxicity and cancers, which may inform future environmental risk assessments and support the development of evidence-based strategies for reducing population exposure to SPAs.
{"title":"Urinary synthetic phenolic antioxidants exposure and plasma microRNA signatures: A profile and functional analysis in a Chinese population-based study","authors":"Yuxin Xu , Zirui Zhang , Xulin Zhang , Jiajia Zhu , Rui Zeng , Wending Li , Xuedan Xu , Lulu Wang , Pinpin Long , Tao Jing , Tangchun Wu , Yu Yuan","doi":"10.1016/j.enceco.2025.12.015","DOIUrl":"10.1016/j.enceco.2025.12.015","url":null,"abstract":"<div><div>Synthetic phenolic antioxidants (SPAs), recognized as contaminants of emerging concern, have been implicated in potential adverse health outcomes. Nevertheless, their epigenetic effects, particularly on plasma microRNAs (miRNAs) in humans, remain poorly characterized. This study aimed to investigate the associations between urinary concentrations of SPAs and plasma miRNA profiles, and further explore their potential biological functions. We quantified nine urinary SPAs in 142 Chinese adults by ultraperformance liquid chromatography-tandem mass spectrometry. Multivariate linear regression was employed to assess single-chemical relation, while multi-chemical associations were evaluated using two-way orthogonal partial least-squares analysis and weighted quantile sum regression. To explore the potential origin of SPA-related plasma miRNAs, we analyzed associations between miRNA levels in plasma and leukocytes. Leveraging leukocyte mRNA sequencing data and public databases, we performed pathway enrichment analysis to identify the pathways associated with SPA-associated miRNAs. We found that urinary 4-tert-Octylphenol and 2,6-di-tert-butyl-4-hydroxy-4-methyl-2,5-cyclohexadienone were significantly associated with 2 and 7 plasma miRNAs, respectively (False discovery rate < 0.10). Furthermore, mixed exposure to SPAs was associated with five miRNAs (miR-3135b, miR-769-5p, miR-548k, miR-3188, miR-7705) in both two models. Notably, miR-769-5p and miR-3135b demonstrated consistent associations across all analytical approaches. The positive associations between plasma levels of miR-769-5p, miR-548k, and miR-3188 and their corresponding intra-leukocyte levels (<em>P</em> < 0.05) suggested that leukocytes might serve as a potential source of these miRNAs. Functional analyses identified that SPA-related miRNAs were involved in pathways related to neurotoxicity and cancers, which may inform future environmental risk assessments and support the development of evidence-based strategies for reducing population exposure to SPAs.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 642-651"},"PeriodicalIF":8.2,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-20DOI: 10.1016/j.enceco.2025.12.016
Wang Fu , Yundie Liang , Quan Chen , Min Wu , Danping Wu , Patryk Oleszczuk , Bo Pan
The coexistence of cations and anions critically influences contaminant behavior in various environments, yet their roles in redox-driven remediation remain underexplored. This study elucidates how cations (K(I), Mg(II), Zn(II), Cu(II), and Cr(III)) enhance biochar-mediated Cr(VI) removal through electrostatic modulation. By quantitatively decoupling the adsorption and reduction pathways, we demonstrated that cation co-presence promoted Cr(VI) adsorption (3.5–26.2-fold) and reduction (1.1–3.0-fold), with more than 63.9 % the overall Cr(VI) removal attributing to reduction. While superoxide radicals (·O₂−) contributed− to liquid-phase reduction, their efficacy depended on interfacial accessibility rather than abundance. A significant correlation between zeta potential elevation and Cr(VI) reduction (P < 0.01) indicated electrostatic modulation as the key mechanism for the enhanced Cr(VI) removal in the presence of ions. Two-dimensional correlation spectroscopy (2DCOS) revealed that the preferential complexation of Cr(III) with carboxyl groups served as the primary electrostatic modulation pathway, retarding Cr(VI) adsorption. Subsequent reduction was driven by phenolic hydroxyl groups, which were oxidized to carboxylates during the conversion of Cr(VI) to Cr(III). This work emphasizes surface charge modification as a critical strategy for optimizing the redox functionality of biochar.
{"title":"Cation-driven electrostatic modulation enhances Cr(VI) reduction by biochar","authors":"Wang Fu , Yundie Liang , Quan Chen , Min Wu , Danping Wu , Patryk Oleszczuk , Bo Pan","doi":"10.1016/j.enceco.2025.12.016","DOIUrl":"10.1016/j.enceco.2025.12.016","url":null,"abstract":"<div><div>The coexistence of cations and anions critically influences contaminant behavior in various environments, yet their roles in redox-driven remediation remain underexplored. This study elucidates how cations (K(I), Mg(II), Zn(II), Cu(II), and Cr(III)) enhance biochar-mediated Cr(VI) removal through electrostatic modulation. By quantitatively decoupling the adsorption and reduction pathways, we demonstrated that cation co-presence promoted Cr(VI) adsorption (3.5–26.2-fold) and reduction (1.1–3.0-fold), with more than 63.9 % the overall Cr(VI) removal attributing to reduction. While superoxide radicals (·O₂<sup>−</sup>) contributed<sup>−</sup> to liquid-phase reduction, their efficacy depended on interfacial accessibility rather than abundance. A significant correlation between zeta potential elevation and Cr(VI) reduction (<em>P</em> < 0.01) indicated electrostatic modulation as the key mechanism for the enhanced Cr(VI) removal in the presence of ions. Two-dimensional correlation spectroscopy (2DCOS) revealed that the preferential complexation of Cr(III) with carboxyl groups served as the primary electrostatic modulation pathway, retarding Cr(VI) adsorption. Subsequent reduction was driven by phenolic hydroxyl groups, which were oxidized to carboxylates during the conversion of Cr(VI) to Cr(III). This work emphasizes surface charge modification as a critical strategy for optimizing the redox functionality of biochar.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 680-687"},"PeriodicalIF":8.2,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-20DOI: 10.1016/j.enceco.2025.12.011
Jun Wang , Wenjun Wang , Yucheng Hou , Qian Li , Bin Gong , Miaomiao Qu , Yun Shi , Jianmeng Chen , Li’an Hou
Although the photothermal synergistic catalysis technology shows great potential for eliminating indoor volatile organic compounds (VOCs), its catalytic degradation of multi-component VOCs with different polarities still faces challenges such as insufficient catalytic oxidation performance and weak selective adsorption. This study innovatively utilized waste silk textiles as the sustainable carbon source to successfully synthesize a biochar-based transition metal oxide composite catalyst via an in-situ growth method, constructing the MnOx/C/TiO2 ternary composite catalyst. The experimental result demonstrated that the optimal catalyst (TSTMn-0.05) had remarkable synergistic removal efficiency for the mixed pollutant of CH2O and C7H8 under photothermal synergistic catalysis, and featured the degradation rates of 98.9 % and 85.2 % respectively within 90 min for CH2O and C7H8 Its excellent performance stems from the broad-spectrum adsorption and enrichment of various polar VOCs by the biochar matrix, the unique heterojunction structure of the catalyst, and the synergistic effect of the multivalent redox cycling of Mn ions and the photothermal effect. During the photothermal synergy process, multiple effects jointly promote the efficient separation of photogenerated carriers and the generation of a large number of reactive oxygen species (ROS), thereby driving the deep mineralization of VOCs. This study not only achieves the high-value resource utilization of waste textiles but also provides a new strategy for developing advanced photothermal catalysts capable of efficiently purifying complex and multi-component VOCs.
{"title":"In-situ synthesis of biochar-based transition metal oxide composite catalysts for highly photothermal oxidation single- and multi-component indoor VOCs","authors":"Jun Wang , Wenjun Wang , Yucheng Hou , Qian Li , Bin Gong , Miaomiao Qu , Yun Shi , Jianmeng Chen , Li’an Hou","doi":"10.1016/j.enceco.2025.12.011","DOIUrl":"10.1016/j.enceco.2025.12.011","url":null,"abstract":"<div><div>Although the photothermal synergistic catalysis technology shows great potential for eliminating indoor volatile organic compounds (VOCs), its catalytic degradation of multi-component VOCs with different polarities still faces challenges such as insufficient catalytic oxidation performance and weak selective adsorption. This study innovatively utilized waste silk textiles as the sustainable carbon source to successfully synthesize a biochar-based transition metal oxide composite catalyst via an in-situ growth method, constructing the MnO<sub>x</sub>/C/TiO<sub>2</sub> ternary composite catalyst. The experimental result demonstrated that the optimal catalyst (TSTMn-0.05) had remarkable synergistic removal efficiency for the mixed pollutant of CH<sub>2</sub>O and C<sub>7</sub>H<sub>8</sub> under photothermal synergistic catalysis, and featured the degradation rates of 98.9 % and 85.2 % respectively within 90 min for CH<sub>2</sub>O and C<sub>7</sub>H<sub>8</sub> Its excellent performance stems from the broad-spectrum adsorption and enrichment of various polar VOCs by the biochar matrix, the unique heterojunction structure of the catalyst, and the synergistic effect of the multivalent redox cycling of Mn ions and the photothermal effect. During the photothermal synergy process, multiple effects jointly promote the efficient separation of photogenerated carriers and the generation of a large number of reactive oxygen species (ROS), thereby driving the deep mineralization of VOCs. This study not only achieves the high-value resource utilization of waste textiles but also provides a new strategy for developing advanced photothermal catalysts capable of efficiently purifying complex and multi-component VOCs.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 652-668"},"PeriodicalIF":8.2,"publicationDate":"2025-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.enceco.2025.12.012
Judit Kalman , Rocío Fernández-Saavedra , Carla Díaz-Tielas , Mona Connolly , Ana I. Cardona-García , Nathaniel Clark , Richard D. Handy , Eric A.J. Bleeker , Isabel Rucandio , José María Navas , María Luisa Fernández-Cruz
To identify nanomaterials of potential environmental concern and to support risk assessment for regulatory purposes bioaccumulation testing is required. However, further guidance is needed when applying the fish bioaccumulation OECD test guideline (TG) No. 305 to nanomaterials. Also questions remain surrounding the most appropriate exposure route and if subtle modifications to these materials (e.g. different coatings) will influence bioaccumulation potential. Therefore in this study OECD TG 305 was applied to assess the bioaccumulation potential of CdTe quantum dots (QDs) with additional considerations for testing nanomaterials. CdTe QDs were selected for our studies because of their increasing use, possible release to water and limited information on their bioaccumulation potential in fish. To specifically address the influence of exposure route and surface coating on bioaccumulation, the uptake and depuration kinetics of two differently coated (carboxylate and polyethylene glycol coatings) CdTe QDs were investigated in rainbow trout (Oncorhynchus mykiss) following either aqueous or dietary exposure. In the dietary exposure bioaccumulation assays, fish were exposed to CdTe QDs at concentrations of 10 or 100 mg/kg for 28 days, followed by a 28-day depuration period to derive biomagnification factors (BMFs). In the aqueous exposure bioaccumulation tests, fish were exposed to 4 or 40 μg CdTe QDs /L for 28 days, followed by a 14-day depuration period to derive bioconcentration factors (BCFs). Both materials showed a low bioaccumulation potential and while a higher uptake was seen for the PEG coated materials, overall biodistribution, uptake and depuration kinetics were similar. The dietary exposure route allowed good and consistent estimations of BMF following both sequential and simultaneous methods. Aqueous exposures showed CdTe QDs dissolution in aquarium water and a steady state was not reached within 28 days, which challenged derivation of BCF values.
This study provides important information on two differently coated CdTe QDs bioaccumulation, on OECD TG 305 applicability to metallic nanomaterials and on the reporting of accurate regulatory acceptable indicators of nanomaterial bioaccumulation potential.
{"title":"Effects of exposure route and surface coating on the bioaccumulation of CdTe quantum dots in fish. Considerations for testing nanomaterials following OECD Test guideline No. 305","authors":"Judit Kalman , Rocío Fernández-Saavedra , Carla Díaz-Tielas , Mona Connolly , Ana I. Cardona-García , Nathaniel Clark , Richard D. Handy , Eric A.J. Bleeker , Isabel Rucandio , José María Navas , María Luisa Fernández-Cruz","doi":"10.1016/j.enceco.2025.12.012","DOIUrl":"10.1016/j.enceco.2025.12.012","url":null,"abstract":"<div><div>To identify nanomaterials of potential environmental concern and to support risk assessment for regulatory purposes bioaccumulation testing is required. However, further guidance is needed when applying the fish bioaccumulation OECD test guideline (TG) No. 305 to nanomaterials. Also questions remain surrounding the most appropriate exposure route and if subtle modifications to these materials (e.g. different coatings) will influence bioaccumulation potential. Therefore in this study OECD TG 305 was applied to assess the bioaccumulation potential of CdTe quantum dots (QDs) with additional considerations for testing nanomaterials. CdTe QDs were selected for our studies because of their increasing use, possible release to water and limited information on their bioaccumulation potential in fish. To specifically address the influence of exposure route and surface coating on bioaccumulation, the uptake and depuration kinetics of two differently coated (carboxylate and polyethylene glycol coatings) CdTe QDs were investigated in rainbow trout (<em>Oncorhynchus mykiss</em>) following either aqueous or dietary exposure. In the dietary exposure bioaccumulation assays, fish were exposed to CdTe QDs at concentrations of 10 or 100 mg/kg for 28 days, followed by a 28-day depuration period to derive biomagnification factors (BMFs). In the aqueous exposure bioaccumulation tests, fish were exposed to 4 or 40 μg CdTe QDs /L for 28 days, followed by a 14-day depuration period to derive bioconcentration factors (BCFs). Both materials showed a low bioaccumulation potential and while a higher uptake was seen for the PEG coated materials, overall biodistribution, uptake and depuration kinetics were similar. The dietary exposure route allowed good and consistent estimations of BMF following both sequential and simultaneous methods. Aqueous exposures showed CdTe QDs dissolution in aquarium water and a steady state was not reached within 28 days, which challenged derivation of BCF values.</div><div>This study provides important information on two differently coated CdTe QDs bioaccumulation, on OECD TG 305 applicability to metallic nanomaterials and on the reporting of accurate regulatory acceptable indicators of nanomaterial bioaccumulation potential.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"8 ","pages":"Pages 618-630"},"PeriodicalIF":8.2,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145839477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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