Environmental Chemistry and Ecotoxicology最新文献

{"title":"Comparison of Canna indica and Acorus calamus for surfactant removal in biochar augmented constructed wetlands","authors":"Swati Singh ,&nbsp;Sunil Kumar Suman ,&nbsp;Kasturi Dutta ,&nbsp;Achlesh Daverey","doi":"10.1016/j.enceco.2024.11.003","DOIUrl":"10.1016/j.enceco.2024.11.003","url":null,"abstract":"<div><div>Surfactants get discharged indiscriminately in wastewater which increased several fold during COVID-19, raising environmental concerns. In this study, two locally available plant species <em>Canna indica</em> and <em>Acorus calamus</em> were compared for the sodium dodecyl sulfate (SDS, − a chemical surfactant) removal in vertical flow constructed wetlands (VFCWs) augmented with biochar. The dose-response relationship was studied for 144 days in four phases by varying the SDS concentration at 10, 25, 50, and 100 ppm in wastewater. The mean SDS removal efficiencies varied from 85 % - 98 % during the different phases. The results suggested that planted artificial wetlands acted more stable than unplanted ones, although the removal efficiencies of the planted and unplanted were found similar (97.9 % - 98.4 %) in phase 4. Further, GC–MS analysis confirmed C₂ products formed during SDS degradation indicating mineralization of SDS. The bioconcentration factor (BCF) and translocation factor (TF) studies revealed no accumulation of SDS in the roots of both plants as BCF _(root) &lt; 1 whereas, the aerial part of <em>C. indica</em> showed bioaccumulation of SDS with BCF _(aerial) values nearly 1. TF for SDS was &gt;1 in the case of both plants, among which translocation of SDS in <em>C. indica</em> with biochar amendment (TF = 17.8) was found to be highest. TF values indicated that biochar may have supported the uptake and translocation of SDS in <em>C. indica</em> whereas biochar has not supported the pollutant transfer in <em>A. calamus</em>. In terms of plant health, <em>C. indica</em> showed better growth and higher biomass increase than the <em>A. calamus</em>. The results implicate that <em>C. indica</em> with biochar-amended CW systems has great potential and can be recommended for efficient removal and uptake of SDS.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 130-140"},"PeriodicalIF":9.0,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of nitrifying bacteria and exploring a novel approach for toxicity monitoring in water","authors":"Suleman Shahzad ,&nbsp;Syed Ejaz Hussain Mehdi ,&nbsp;Aparna Sharma ,&nbsp;Fida Hussain ,&nbsp;Anup Gurung ,&nbsp;Woochang Kang ,&nbsp;Min Jang ,&nbsp;Sang Eun Oh","doi":"10.1016/j.enceco.2024.10.005","DOIUrl":"10.1016/j.enceco.2024.10.005","url":null,"abstract":"<div><div>A novel methodology has been developed to detect toxicity by harnessing the capabilities of nitrifying bacteria, ensuring the accurate identification of harmful chemicals in water. This innovative method leverages the inherent ability of bacteria to convert ammonia into nitrite and nitrate through oxidation, as demonstrated by the chemical reactions: 2 NH₄⁺ + 3 O₂ → 2 NO₂⁻ + 2 H₂O + 4H⁺ and 2 NO₂⁻ + O₂ → 2 NO₃⁻. Increased oxygen consumption and reduced pH levels are outcomes of the oxidation process, which are essential parameters in our evaluation of nitrifying bacteria toxicity using the test kit. The validation of the methodology was confirmed by conducting accurate measurements of oxygen consumption and pH fluctuations. Upon exposure to an experimental setting with a concentration of 100 mg/L of ammonia, it was noted that the oxygen consumption rate was around 3.2 mL. The presence of hexavalent chromium (Cr⁶⁺) and other metals have been shown to impede the process of nitrification, leading to lower oxygen consumption and a subsequent drop in pH levels. Ammonia-oxidizing bacteria (AOB) and Nitrite-oxidizing bacteria (NOB) were effectively isolated from a nitrifying bacteria master culture reactor. The metagenomics analysis indicated that the major isolated strains possess a sequence similarity of 99 % and 100 % with <em>Nitrosomonas europaea</em> and <em>Nitrobacter winogradskyi</em>, respectively. With its high sensitivity and cost-effectiveness, our nitrifying bacteria test kit is well-suited for the monitoring of toxic chemicals in water, making it an ideal tool for this purpose. This bioassay testing kit represents a notable progression in environmental protection, offering a strong and effective method for promptly identifying water pollutants.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 106-116"},"PeriodicalIF":9.0,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of biomarkers (PAH, n-alkane, hopane, estrane) in different colors of plastic resin pellets and surface sediments from coastal area of the Makuran-Oman Sea","authors":"Mozhdeh Malekolkalami,&nbsp;Alireza Riyahi Bakhtiari,&nbsp;Mohsen Mirzai,&nbsp;Rahil Nozarpour","doi":"10.1016/j.enceco.2024.11.001","DOIUrl":"10.1016/j.enceco.2024.11.001","url":null,"abstract":"<div><div>The unique attributes of the study area, situated near the Strait of Hormuz—an extensively utilized oil shipping corridor for Iran and neighboring Arabian nations—encompass oil extraction and exploitation, the establishment of an oil export hub, the advancement of petrochemical industries, as well as tourism and transportation activities. This research represents the first examination of the sources of plastic resin pellet release, addressing both local and non-local contributions. To conduct this study, samples of plastic resin pellet and coastal and intertidal surface sediments were collected from seven stations on the shores of the Oman Sea in Hormozgan province (Sirik, Garook, Ziarat, Karpan, Koohestak, Gohardo, and Kargan) with four replications to determine the origin and spatial distribution pattern of hydrocarbons and the diffusion source of plastic resin pellets (offshore or regional). Plastic resin pellets were separated based on color (white, yellow, brown, and black). Soxhlet was used to extract hydrocarbons, two stages of column chromatography were used to separate compounds, and gas chromatography–mass spectrometry (GC–MS) was used to identify and determine their concentration. The total n-alkanes concentration ranged from 2940 to 18,711 (μg/g) in coastal surface sediments, from 19,721–1678 (μg/g) in intertidal surface sediments, and from 11,481.50 to 55,601.41 (μg/g) in plastic resin pellets. A similar trend was found for the total PAH concentration which ranged from 135.57 to 3890.62 (ng/g) in coastal sediments, from 1820.28 to 6579.55 (ng/g) in intertidal sediments, and from 3714.19 to 66/1920451 (ng/g) in plastic resin pellets. According to the sediment pollution criteria, a high pollution level was assessed in most of the stations. In most of the surface sediments and plastic resin pellets, the presence of unresolved complex mixture (UCM), the carbon preference index (CPI) lower than 1, and the diagnostic ratios of PAH, hopane, and sterane compounds indicated petrogenic origin for hydrocarbons. The results of principal component analysis based on 16 diagnostic ratios of PAH, <em>n</em>-alkane, hopane, and sterane compounds showed that brown and black plastic resin pellets were placed in a different group than the coastal and intertidal sediments and white and yellow plastic resin pellets. Most likely, the diffusion source of brown and black plastic resin pellets is different and through open water.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 117-129"},"PeriodicalIF":9.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perinatal exposure to PBDE-47 decreases brain glucose metabolism in male adult rats: Associations with shifts in triiodothyronine and neurobehavior","authors":"Qian Sun ,&nbsp;Hui Gao ,&nbsp;Pei Li ,&nbsp;Luming Liu ,&nbsp;Chen Luo ,&nbsp;Jing Li ,&nbsp;Aiguo Wang ,&nbsp;Tao Xia ,&nbsp;Shun Zhang","doi":"10.1016/j.enceco.2024.11.002","DOIUrl":"10.1016/j.enceco.2024.11.002","url":null,"abstract":"<div><h3>Background</h3><div>The brominated flame retardant 2, 2′, 4, 4′-tetrabromodiphenyl ether (PBDE-47) is well known as a developmental neurotoxicant, yet the underlying mechanisms remain elusive. Increasing evidence has demonstrated that brain glucose metabolism perturbation plays a role in neural impairments. Nevertheless, whether this disturbance is involved in PBDE-47-induced neurotoxicity remains unknown.</div></div><div><h3>Objectives</h3><div>To explore the impacts of perinatal PBDE-47 exposure on brain glucose metabolism, and its link to thyroid hormones (THs) levels as well as neurobehavioral changes.</div></div><div><h3>Methods</h3><div>Female Sprague-Dawley rats were orally exposed to PBDE-47 at environmentally relevant levels (0.1, 1.0, and 10.0 mg/kg bw) from pre-pregnancy through weaning of offspring. The male offspring were continued to raise to 88 days after birth for follow-up experiments. Morris water maze and Open field tests were performed to assess the neurobehavioral alterations. The brain glucose metabolism was evaluated using ¹⁸F-labeled fluorodeoxyglucose (¹⁸F-FDG) positron emission tomography. Serum THs levels were measured via enzyme-linked immunosorbent assay.</div></div><div><h3>Results</h3><div>Perinatal exposure to PBDE-47 induced neurobehavioral impairments in adult male rats as evidenced by learning and memory impairments, hyperactivity and anxiety-like behavior. Moreover, positron emission tomography showed that the glucose metabolism in the whole and the specific brain regions were markedly declined. Interestingly, variations in brain glucose metabolism were associated with the increased serum triiodothyronine (T₃) levels, and both were linked to neurobehavioral disorders.</div></div><div><h3>Conclusion</h3><div>Exposure to environmentally related levels of PBDE-47 at critical developmental stages lowers glucose metabolism in the whole brain and in various brain regions, which is associated with behavioral and cognitive deficits in adult male rats. Moreover, the association may be influenced by the disturbance of T₃ homeostasis.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 84-96"},"PeriodicalIF":9.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Associations of polycyclic aromatic hydrocarbons exposure with mortality and effect modification by folate biomarkers in a prospective population","authors":"Siyu Duan ,&nbsp;Kairong Wang ,&nbsp;Chenming Gu ,&nbsp;Junmin Zhu ,&nbsp;Yafei Wu ,&nbsp;Ya Fang","doi":"10.1016/j.enceco.2024.10.009","DOIUrl":"10.1016/j.enceco.2024.10.009","url":null,"abstract":"<div><div>The associations of folate biomarkers and polycyclic aromatic hydrocarbons (PAHs) in the general population remain unclear. Therefore, this study aimed to examine whether folate biomarkers are associated with PAHs, and whether folate biomarkers can mitigate adverse health outcome caused by PAHs. This prospective cohort study included 11,246 participants from the National Health and Nutrition Examination Survey (NHANES), which documented 1,303 deaths over a mean follow-up of 9.1 years. Multivariable linear regression models were used to examine the relationship between urinary individual PAHs and folate biomarkers. Multivariable Cox proportional hazards regression models were used to calculate hazard ratios and 95 % CIs for the associations of PAHs and folate biomarkers with CVDs mortality and all-cause mortality. We found negative associations between folate in red blood cells (RBC) and urinary 1-Hydroxyphenanthrene (percentage change for a 2·7 fold-increase in folate −4.19 %, 95 % CI -5.80 % to −2.56 %CI), 2-Hydroxyfluorene (−6.66 %, −7.84 % to −5.49 %), 3-Hydroxyfluorene (−5.78 %, −6.77 % to −4.78 %)) and 1-Hydroxynapthalene (−2.75 %, −3.48 % to −2.01 %). The associations between serum folate and PAHs were consistent with those observed for RBC folate, and negative associations were also found between serum folate and 2-Hydroxynapthalene (−4.10 %, −5.26 % to −2.94 %). Within the lowest quartile of folate levels in RBC, there are strong associations of 2-Hydroxyfluorene, 3-Hydroxyfluorene, 1-Hydroxynapthalene, and 2-Hydroxynapthalene with elevated risk of CVDs mortality [HRs (95 % CI) &gt;1]. As folate levels in RBC increase to the third and fourth quartiles, these associations no longer exist [HRs (95 % CI) &lt;1, <em>P</em>-interaction&lt;0.05]. The positive associations between urinary PAHs and CVDs mortality are also eliminated as serum folate levels rise [HRs (95 % CI) &lt;1, <em>P</em>-interaction&lt;0.05]. Furthermore, we also found higher levels of folate in both RBC and serum can greatly reduce the adverse impact of 1-Hydroxynapthalene on all-cause mortality. Consistent results were also validated in daily dietary folate and the folic acid supplement intake. Our study highlighted a robust negative relationship between urinary PAHs and folate. Additionally, folate was found to effectively mitigate mortality caused by PAHs, although we did not observe a direct reduction in mortality attributable to folate.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 97-105"},"PeriodicalIF":9.0,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The plastisphere ecology: Assessing the impact of different pollution sources on microbial community composition, function and assembly in aquatic ecosystems","authors":"Muneer Ahmad Malla ,&nbsp;N.L. Malambule ,&nbsp;Isaac D. Amoah ,&nbsp;Jonathan Featherston ,&nbsp;Arshad Ismail ,&nbsp;Faizal Bux ,&nbsp;Sheena Kumari","doi":"10.1016/j.enceco.2024.10.010","DOIUrl":"10.1016/j.enceco.2024.10.010","url":null,"abstract":"<div><div>In aquatic ecosystems microplastics (MPs) provide new habitat for microbes, forming the plastisphere. While, the effect of different pollution sources on microbiome compositions, functions and assembly processes remains largely cryptic, and hence requires further investigation. Thus, in this study microplastic and surrounding water samples were collected from four different locations and performed meta-analysis to evaluate the impact of different pollution sources on microbial community composition, function and assembly in plastisphere and surrounding environment. Results demonstrated that pollution source had a significant effect on microbial diversity (<em>p</em> = 0.0012) and composition (PERMANOVA <em>F =</em> 16.386; <em>R</em>^<em>2</em> = 0.15, <em>p</em> &lt; 0.001) in surface water and plastisphere. Specifically, plastisphere harboured distinct microbial community and recruited unique taxa compared to surface water, suggesting that microplastics serve as new ecological habitats. We observed a clear shift in microbial community composition, with Bacteroidetes being significantly higher in surface water significantly, whereas α- and β-Proteobacteria dominated the plastic surface (<em>p</em> &lt; 0.05). These change in microbial communities were more likely due to unique chemical properties and substrates enrichment on plastic surfaces and different pollution sources. Genes involved in metabolism, signaling, cell motility, vesicular transport energy production and defence were significantly enriched in plastisphere (<em>p</em> = 0.001). The environmental factors such as DO and salinity drive the microbial communities in plastisphere. Niche-based selection process govern assembly in plastisphere microbiome, while as stochastic processes dominated the assembly process in aquatic microbial communities. These finding suggest that trajectory, continued microplastic emission and transport in aquatic ecosystems could pose serious planetary and health issues.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 75-83"},"PeriodicalIF":9.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing microplastics remediation in bioretention systems using biochar/kaolin: Optimizing organics removal, plant health, and microbial community dynamics","authors":"Tauseef Ahmad ,&nbsp;Licheng Peng ,&nbsp;Tariq Mehmood ,&nbsp;Sumaira Gul ,&nbsp;Zahid Ullah ,&nbsp;Shengyou Lin ,&nbsp;Siqi Li ,&nbsp;Eric D. van Hullebusch","doi":"10.1016/j.enceco.2024.10.008","DOIUrl":"10.1016/j.enceco.2024.10.008","url":null,"abstract":"<div><div>Bioretention systems can efficiently eliminate microplastics (MPs) from stormwater and prevent their potential pollution in surface water. However, MPs dynamics in bioretention systems and their effects on microbes, plants, and organics removal are unknown. In this study, five lab-scale bioretention columns (i.e., control and four treatments) were established and filled with soil and fillers (zeolite and ceramsite). Various sorbents were utilized in columns, including biochar, kaolin and kaolin-biochar (KBC) composites for MPs adsorption. This study examines how biochar/kaolin amendment affects MPs and organics (COD and TOC) removal, plant health, and microbial community structure in bioretention systems. In the 60-day time-series column experiment, all amended columns removed over 90% of MPs compared to the control. The biochar, kaolin and their combined composite eliminated MPs by 90%, 94%, and 97%, respectively. Adding vegetation to the columns improved MPs removal. Moreover, bioretention systems were more effective in removing MPs ranging from 0.6 to 1 mm with a 71% removal rate than MPs ranging from 0.3 to 0.6 mm, resulting in a 54% removal. Organics were removed contrarily in the soil and filler layer of the bioretention system, with the soil layer removal higher due to increased microbial activity. The removal rate of total organic carbon was higher (90%) than that of chemical oxygen demand (80%). The most dominant phylum of the bacteria in the soil of treatment columns were <em>Proteobacteria</em> and <em>Acidobacteriota,</em> which constituted 16‐27% and 41‐58%, respectively. While the dominant phylum in that of fillers were <em>Bacteroidota</em> and <em>Firmicutes,</em> which constituted 18‐42% and 42‐65%, respectively. The maximum microbial enrichment was observed in the biochar and KBC vegetated columns. This work advances our understanding of the complex dynamics between microplastics and organic matter in stormwater and how, individually and in combination, vegetation, biochar, and kaolin vegetation, biochar, and kaolin, individually and in combination, enhance bioretention systems' effectiveness in managing multiple pollutants.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 141-153"},"PeriodicalIF":9.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142759016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A longitudinal study of mass loads of quaternary ammonium compounds in sludge associated with COVID-19 Stringency Index indicators in Beijing, China","authors":"Bipin Thapa ,&nbsp;Suman Sapkota ,&nbsp;Jingxuan Chen ,&nbsp;Jiawulan Zunong ,&nbsp;Yeerlin Asihaer ,&nbsp;Nourhan M. Khattab ,&nbsp;Menglong Li ,&nbsp;Ding Ding ,&nbsp;Sten H. Vermund ,&nbsp;Mushui Shu ,&nbsp;Yifei Hu","doi":"10.1016/j.enceco.2024.10.004","DOIUrl":"10.1016/j.enceco.2024.10.004","url":null,"abstract":"<div><div>This study estimated population normalized mass loads (PNML) of quaternary ammonium compounds (QACs) including alkyltrimethylammonium chloride (ATMAC), benzylalkyldimethylammonium chloride (BAC), and dialkyldimethylammonium chloride (DADMAC) and assessed their associations with COVID-19 containment policies. We collected daily sludge specimens from five wastewater treatment plants in Beijing from July 2020 to May 2022. Using liquid chromatography-tandem mass spectrometry, we determined QAC concentrations and backward-estimated their PNML. We used COVID-19 Oxford Stringency Index and its metrics to measure containment policies. We analysed the relationship between QACs and containment measures using linear regression models. Among QACs categories, ΣBAC had median PNML of 94.54 μg/person/day, ΣDADMAC had 282.36 μg/person/day, and ΣATMAC had 802.55 μg/person/day. The ΣQACs median PNML was 1186.12 μg/person/day. The PNML of QACs appeared to have general increasing trend over time and were significantly different across seasons. PNML increased on average by 11 μg/person/day (95 % CI: 3.2, 19) for ΣBAC per 10-unit increase in Stringency Index score. Notably, higher stringency levels in three index indicators — workplace closures, internal movement restrictions, and public gathering restriction were positively associated with higher ΣQACs PNML. Sludge derived QACs may reflect the magnitude of disinfectant use at different stages of pandemic control response.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 39-49"},"PeriodicalIF":9.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Industrial by-products (ferrous sulfate minerals and stone powder) can serve as amendments to remediate Cd-As paddy soil, alleviating Cd-As accumulation in rice","authors":"Dele Meng ,&nbsp;Shuoyu Li ,&nbsp;Zegui Li ,&nbsp;Zhencheng Li ,&nbsp;Peiyi Huang ,&nbsp;Yongjun Guo ,&nbsp;Huashou Li","doi":"10.1016/j.enceco.2024.10.007","DOIUrl":"10.1016/j.enceco.2024.10.007","url":null,"abstract":"<div><div>Our previous research has shown that industrial by-products such as ferrous sulfate mineral and stone powder as amendments can remediate Cadmium (Cd) and arsenic (As) soil. However, their role in the soil-rice system is unknown. Therefore, this article explored the effects of the combined use of industrial by-products and commercial conditioners on the accumulation of Cd-As in weakly alkaline and acidic soil-rice systems. Potted experiments shown that SL (stone powder+ferrous sulfate mineral) and SLW (stone powder+ferrous sulfate mineral+Weidikang conditioner) could reduce the availability of Cd-As in soil by adjusting soil pH and CEC, increase iron film content on the root surface, strengthening the “barrier” for fixing Cd-As. Brown rice Cd was lower than the national food safety standard of 0.20 mg kg⁻¹ (GB2762–2022). 1 % SLW could reduce brown rice As from 1.24 mg kg⁻¹ to 0.83 mg kg⁻¹. The results of field experiments confirmed the conclusion of pot experiments. SL and SLW not only reduced the accumulation of Cd-As in rice but also significantly increased rice yield by 16.58 % and 11.68 %, respectively. Compared to the two types of conditioning agents sold in the market, the material costs have been reduced by 79.1 % -86.5 % and 12.4 % -43.3 %, respectively. In summary, this study demonstrates that ferrous sulfate minerals and stone powder could efficiently remediate Cd-As pollution in paddy soil under different acid-base conditions, providing an application example for the resource utilization of industrial by-products for the remediation of Cd-As pollution in paddy soil.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 62-74"},"PeriodicalIF":9.0,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biosorption of Vanadium (V) and Chromium (VI) using abscised coconut leaves powder: Equilibrium and continuous packed bed column studies","authors":"Ankita S. Gawas,&nbsp;Poonam R. Sutar,&nbsp;Jyoti S. Gokhale","doi":"10.1016/j.enceco.2024.10.003","DOIUrl":"10.1016/j.enceco.2024.10.003","url":null,"abstract":"<div><div>The presence of heavy metals such as Vanadium (V) and Chromium (VI) in industrial waste are detrimental and toxic to our agricultural systems. Strategies involving the removal of heavy metals from industrial waste are the need of the hour. A low-cost biosorbent using abscised coconut leaves (ACL) was employed for successful biosorption of toxic heavy metals, namely Vanadium and Chromium from industrial waste in this study. The zeta potential, BET surface area, SEM, EDAX, XRD, FTIR characterization of ACL powder was carried out. Maximum adsorption capacities of 46.95 mg·g⁻¹ for V (V) and 40.33 mg·g⁻¹ for Cr (VI) was observed. Equilibrium studies demonstrated that 98 % Vanadium (V) was removed at pH 2 for a sorbent dosage of 10 g·L⁻¹ and 100 mgLl⁻¹ of initial metal ion concentration, whereas 99 % Chromium (VI) was removed at pH 1 for a sorbent dosage 10 g·L⁻¹ and 100 mg·L⁻¹ of initial metal ion concentration. Zeta potential studies further confirmed the involvement of anionic adsorption mechanism for biosorption of heavy metals. Column studies were further carried out to study effect of bed height, metal ion concentration and flow rate. The Yoon Nelson model was found to be the best fit for the breakthrough curve data. Furthermore, the experimental data was also tested for Bed Depth Service Time model, which is useful for the scale up of the process. Considering the abundance of this biosorbent and simple method of preparation, ACL powder can be considered as a promising cost-effective option for heavy metal removal from water.</div></div>","PeriodicalId":100480,"journal":{"name":"Environmental Chemistry and Ecotoxicology","volume":"7 ","pages":"Pages 50-61"},"PeriodicalIF":9.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}