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Carbon and nitrogen removal by Chlorella sp. and Scenedesmus sp. suspended and immobilised in non-toxic silica gel in leather processing wastewater 小球藻和场景藻悬浮和固定在无毒硅胶中去除皮革加工废水中的碳和氮
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-04-20 DOI: 10.1080/02757540.2023.2199725
B. S. C. Barcellos, C. B. Agustini, G. S. Rolim, João H. Z. Santos, M. Gutterres
ABSTRACT Microalgae have been effectively used as a nutrient removal method in wastewater treatment. However, the harvesting microalgae step is a major hurdle to the industry. In this study, the silica non-toxic sol–gel is used as a matrix to immobilise microalgae. Non-toxic silica gel matrix was synthesised by tetraethoxysilane (TEOS) derived alcohol free route. This study aims to evaluate the effect of microalgae immobilisation in non-toxic silica gel to remove tanneries wastewater pollutants. The experiments were conducted by applying immobilised Scenedesmus sp. and Chlorella sp. in three concentrations in leather processing wastewater during 72 h of cultivation. The morphology of immobilisation was evaluated by optical microscopy, SEM and Zeta Potential analysis. The rate removals of total nitrogen (TN), total organic carbon (TOC) and Inorganic Carbon (IC) in comparison to immobilised and suspended microalgae were evaluated by the influence of the immobilisation, type of microalgae and microalgae concentration. For both microalgae, immobilisation showed promise for removing these nutrients. The immobilised Chlorella sp. at the initial concentration of 5.84 ± 0.975 mg.L−1 (I-Ch2) had the highest removal by immobilised microalgae, with an uptake of 20.82% of AN, 18.44% of TN, 30.42% of TOC and 64.73% of IC.
微藻作为一种有效去除废水中营养物质的方法已得到广泛应用。然而,微藻的收获步骤是该行业的一个主要障碍。在本研究中,二氧化硅无毒溶胶-凝胶被用作固定微藻的基质。采用四乙氧基硅烷(TEOS)衍生的无醇路线合成了无毒硅胶基质。本研究旨在评价在无毒硅胶中固定微藻对制革废水污染物的去除效果。采用固定化Scenedesmus sp.和小球藻sp.在皮革加工废水中的三种浓度进行了72 培养h。通过光学显微镜、扫描电镜和Zeta电位分析对固定化的形态进行了评价。通过固定化、微藻类型和微藻浓度的影响来评估与固定化和悬浮微藻相比的总氮(TN)、总有机碳(TOC)和无机碳(IC)的去除率。对于这两种微藻来说,固定化有望去除这些营养物质。初始浓度为5.84的固定化小球藻 ± 0.975 mg·L−1(I-Ch2)对固定化微藻的去除率最高,an、TN、TOC和IC的吸收率分别为20.82%、18.44%、30.42%和64.73%。
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引用次数: 1
Nutrient and algal responses to a managed drawdown in an agricultural riverine lake 营养和藻类对农业河流湖泊管理减少的反应
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-04-20 DOI: 10.1080/02757540.2023.2198511
R. Lizotte, J. Murdock, J. M. Taylor, M. Locke
ABSTRACT Water level of a shallow impounded riverine lake was lowered to help improve downstream flows and water quality within the Big Sunflower River in the agriculturally dominated Mississippi Delta, Mississippi, USA. A study was conducted to better understand how nutrient and algal processes within shallow lakes respond to relatively rapid water level changes to guide water resource management decisions. The drawdown was initiated in late summer and completed within six days, ending when outflow was <5% of peak flows. Water depths were reduced from 28-82%. Nutrients (phosphorus, nitrogen and carbon) and water column algal measurements (chlorophyll a, in-vivo chlorophyll, in-vivo phycocyanin, chlorophyll:phycocyanin ratio, and photosynthetic activity) were measured at three sites on days −7, −1, 0, 1, 2, 3, 6, 13, 20, 28, and 34, relative to the start of the drawdown. Nitrogen and phosphorus responses were bimodal, showing a decrease during the initial drawdown phase followed by increasing levels in the ensuing weeks. Algal responses showed complex interactions between nutrients and changes in light availability that were often indirectly related to hydrologic changes. Late summer to early fall drawdowns in small impoundments used to improve downstream flows can have minimal water quality impacts on the upstream impounded systems.
在美国密西西比州农业占主导地位的密西西比三角洲,为了改善大向日葵河下游的流量和水质,降低了一个浅蓄水的河流湖泊的水位。进行了一项研究,以更好地了解浅湖内的营养和藻类过程如何响应相对快速的水位变化,以指导水资源管理决策。缩减始于夏末,并在6天内完成,当流出量<峰值流量的5%时结束。水深减少了28-82%。相对于下降开始的第7、第1、第0、第1、第2、第3、第6、第13、第20、第28和第34天,在三个地点测量了营养物(磷、氮和碳)和水柱藻类测量(叶绿素a、体内叶绿素、体内藻蓝蛋白、叶绿素:藻蓝蛋白比率和光合活性)。氮和磷的响应呈双峰型,在最初的下降阶段呈下降趋势,随后几周呈上升趋势。藻类的响应表现出营养物质与光有效性变化之间复杂的相互作用,这种相互作用往往与水文变化间接相关。夏末到初秋,用于改善下游流量的小型水库的减少对上游蓄水系统的水质影响最小。
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引用次数: 0
Individual and combined toxicity of sulfamethoxazole and desethylatrazine to Chlorella vulgaris: growth inhibition, photosynthetic activity and oxidative stress 磺胺甲恶唑和去乙基latrazine对小球藻的单独和联合毒性:生长抑制、光合活性和氧化应激
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-04-19 DOI: 10.1080/02757540.2023.2189893
Tianxu Zhang, Yan Song, Weiying Xu, Nannan Lu, Yan Chen, R. Jia, Shaohua Sun
ABSTRACT The influence of emerging contaminants on the composition of aquatic ecosystems, including antibiotics and pesticide metabolites, is receiving increasing attention. In this study, the acute and chronic toxic effects of single and combined exposure to sulfamethoxazole (SMX) and desethylatrazine (DEA) on Chlorella vulgaris (C. vulgaris) were evaluated in terms of growth, pigment content and antioxidant systems. The findings demonstrated that cytochrome content and cell growth followed a similar trend for both single and combined exposures, with C. vulgaris being affected in a dose-dependent manner, and chlorophyll content decreasing at high exposures. For SMX and DEA, the maximum inhibition rates at a single exposure were 95.14% and 87.31%, respectively. Cell membrane permeability, superoxide dismutase content and catalase release were significantly increased in the early stages of cultivation. Additionally, cell density was used to calculate the single exposure half effect concentration (EC50), which was then used as part of the toxic unit (TU) method for evaluating mixture interactions. TU analysis revealed that the interaction between SMX and DEA shifted from being synergistic to being antagonistic after 7 d of incubation. These results suggest that SMX and DEA may play a significant role in aquatic ecosystems. GRAPHICAL ABSTRACT
摘要新出现的污染物对水生生态系统组成的影响,包括抗生素和农药代谢产物,正受到越来越多的关注。本研究从生长、色素含量和抗氧化系统等方面评价了磺胺甲恶唑(SMX)和去乙基四嗪(DEA)对小球藻(C.vulgaris)的急性和慢性毒性作用。研究结果表明,细胞色素含量和细胞生长在单次和联合暴露中都遵循相似的趋势,寻常C.vulgaris受到剂量依赖性的影响,高暴露时叶绿素含量下降。对于SMX和DEA,单次暴露的最大抑制率分别为95.14%和87.31%。细胞膜通透性、超氧化物歧化酶含量和过氧化氢酶释放在培养的早期阶段显著增加。此外,细胞密度用于计算单次暴露半效浓度(EC50),然后将其作为毒性单位(TU)方法的一部分用于评估混合物相互作用。TU分析表明,SMX与DEA的相互作用在培养7d后由协同作用转变为拮抗作用。这些结果表明,SMX和DEA可能在水生生态系统中发挥重要作用。图形摘要
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引用次数: 0
Assessing acetamiprid and chlorpyrifos pesticide concentrations in water and sediments across macadamia orchard and communal area small reservoirs 评估澳洲坚果果园和公共地区小型水库的水和沉积物中吡虫啉和毒死蜱农药浓度
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-04-09 DOI: 10.1080/02757540.2023.2199015
Thendo Mutshekwa, L. Mugwedi, Babra Moyo, N. Madala, R. Wasserman, F. Dondofema, T. Dalu
ABSTRACT Pesticides are well known for their persistence in the environment their slow degradation and high toxicity. Aquatic environments, while not the target of many pesticide applications, often receive these chemicals from their catchments through runoff dynamics. Here, we assessed pesticide concentrations of acetamiprid and chlorpyrifos in water and sediment across macadamia orchard and communal area reservoirs in the Levubu area, South Africa, using liquid chromatography tandem mass spectrometry. Analysis of acetamiprid and chlorpyrifos associated with sediments in macadamia orchard reservoirs revealed mean pesticide concentrations of 14.48 µg L−1 and 5.67 µg L−1, respectively, whereas, in communal area reservoirs both pesticides were not detected. Acetamiprid was not detected across reservoir water, whereas the mean pesticide concentration of chlorpyrifos of 6.51 µg L−1 (macadamia orchard) and 0.13 µg L−1 (communal area) were detected. Significant differences were observed for chlorpyrifos concentrations in water samples between macadamia orchard and communal area reservoirs, whereas acetamiprid and chlorpyrifos indicated non-significant differences in sediments. The results indicate that macadamia orchard reservoirs are highly contaminated by acetamiprid and chlorpyrifos. Consequently, these pesticides can alter water quality and ecosystem functioning by reducing species diversity, adjusting community structure, altering energy flow and nutrient recycling.
摘要农药以其在环境中的持久性、缓慢降解和高毒性而闻名。水生环境虽然不是许多农药应用的目标,但通常通过径流动力学从其集水区接收这些化学物质。在这里,我们使用液相色谱-串联质谱法评估了南非莱武布地区澳大利亚坚果园和公共区域水库的水和沉积物中的啶虫脒和毒死蜱的农药浓度。对澳大利亚坚果园水库沉积物中的啶虫脒和毒死蜱的分析表明,平均农药浓度为14.48 µg L−1和5.67 µg L−1,而在公共区域水库中,没有检测到这两种农药。整个水库水中未检测到乙酰胺磷,而毒死蜱的平均农药浓度为6.51 µg L−1(澳洲坚果园)和0.13 µg 检测到L−1(公共区域)。在澳洲坚果园和公共区域水库的水样中观察到毒死蜱浓度的显著差异,而啶虫脒和毒死蜱在沉积物中的浓度差异不显著。结果表明,夏威夷果果园水库受到乙酰甲胺磷和毒死蜱的严重污染。因此,这些杀虫剂可以通过减少物种多样性、调整群落结构、改变能量流动和营养循环来改变水质和生态系统功能。
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引用次数: 0
Exploration of haematite-loaded rice husk biochar as a low-cost nanosorbent to remove Cr (III) from the aqueous media 赤铁矿负载稻壳生物炭作为低成本纳米吸附剂从水介质中去除Cr(III)的探索
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-03-27 DOI: 10.1080/02757540.2023.2188205
T. Iqbal, Fozia Batool, S. Iqbal
ABSTRACT In this study, the biochar of rice husk was modified to a nanosorbent upon loading with haematite for Cr (III) removal from aqueous solutions. Three adsorbents, rice husk, rice husk biochar and haematite-loaded rice husk biochar, were used for equilibrium adsorption studies. SEM and FTIR analysis revealed the presence of pores and various surface active sites on a nanomaterial, which were responsible for the adsorption of Cr (III). C–H, –O–H, C=O stretching vibrations were observed in characterised FTIR peaks. Modelling of adsorption isotherms indicated best fit for Freundlich isotherm with maximum Kf value of 12,218 and 39.5 for linear and non-linear nanomaterial experimental calculations, and positive n value in range of 1–10 for all forms of adsorbents, Dubinin–Radushkevich adsorption saturation capacity qs showed high readings of 9417 and 76.8 for haematite nanomaterial, Elovich isotherm favoured non-linear results in case of nanomaterial with increased Qm values 43.4–112.3 from raw form to nanosorbents and Temkin isotherm with. Kinetic and Thermodynamic results were also summarised. Constants k and h and Qe capacity were tabulated for Pseudo second order model with highest Qe in the range of 20.36–22.52 for haematite loaded biochar nanomaterial. Hence, haematite based rice husk biochar nanostructure was employed as an efficient adsorbent for uptake of chromium.
摘要:本研究将稻壳生物炭经赤铁矿负载后改性为纳米吸附剂,用于去除水溶液中的Cr (III)。采用稻壳、稻壳生物炭和负载赤铁矿的稻壳生物炭三种吸附剂进行平衡吸附研究。扫描电镜(SEM)和红外光谱(FTIR)分析表明,纳米材料上存在孔隙和各种表面活性位点,这些活性位点负责吸附Cr (III)。在表征的FTIR峰中观察到C - h, -O-H, C=O的拉伸振动。模拟吸附等温线的结果表明,在线性和非线性纳米材料实验计算中,最适合Freundlich等温线,最大Kf值为12,218和39.5,所有形式的吸附剂的正n值在1-10范围内,Dubinin-Radushkevich吸附饱和容量qs在赤铁矿纳米材料中分别为9417和76.8。当纳米材料从原始形态到纳米吸附剂的Qm值增加43.4 ~ 112.3时,Elovich等温线有利于非线性结果;总结了动力学和热力学结果。拟二级模型的常数k、h和Qe容量均为表,其中赤铁矿负载的生物炭纳米材料的最高Qe在20.36 ~ 22.52之间。因此,以赤铁矿为基础的稻壳生物炭纳米结构被用作铬的高效吸附剂。
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引用次数: 0
Ionic adjustments do not alter plankton composition in low salinity Penaeus vannamei intensive nursery with synbiotic system 离子调节不会改变具有合生元系统的低盐度南美白对虾强化苗圃中浮游生物的组成
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-03-10 DOI: 10.1080/02757540.2023.2186405
Otávio Augusto Lacerda Ferreira Pimentel, N. H. They, Rildo José Vasconcelos de Andrade, Valdemir Queiroz de Oliveira, A. Amado, A. Gálvez, L. O. Brito
ABSTRACT The aim of this study was to test the effect of different ionic adjustments in low salinity water on the composition and temporal variation of plankton from intensive shrimp nurseries with a synbiotic system. For this, a Penaeus vannamei nursery (35 days) was carried out with three treatments: T1 – diluted seawater (control; salinity ∼2.5 g L−1), T2 – salinity ∼2.5 g L−1 with K+ adjustment to approximate the seawater equivalent concentration, and T3 – salinity ∼2.5 g L−1 with Ca:Mg:K ratio adjusted to 1:3:1. Rice bran processed by probiotic microorganisms was used as an organic carbon source. Phytoplankton and zooplankton were sampled weekly and analysed using standard methods. The temporal variation of phytoplankton and zooplankton composition were more pronounced than differences among treatments indicating that the ionic adjustment had little effect on these communities. During the experimental time, the dominant phyla in phytoplankton were Ochrophyta, Cyanophyta and Chlorophyta, whereas zooplankton’s dominant phyla were Ciliophora, Amoebozoa, and Cercozoa. Cyanophyta’s relative abundance was lower than traditional biofloc systems, suggesting a higher control of these microorganisms in synbiotic systems. Ionic adjustments have then a low potential to affect plankton, likely because limitation by these ions was not achieved under the ionic manipulations tested.
摘要本研究旨在研究低盐度水体中不同离子调节对集约化共生对虾苗圃浮游生物组成及时间变化的影响。为此,在凡纳滨对虾苗期(35 d)进行了三种处理:T1稀释海水(对照;盐度~ 2.5 g L−1),T2 -盐度~ 2.5 g L−1,K+调整到接近海水当量浓度,T3 -盐度~ 2.5 g L−1,Ca:Mg:K比调整到1:3:1。以经益生菌处理的米糠为有机碳源。浮游植物和浮游动物每周取样,并使用标准方法进行分析。浮游植物和浮游动物组成的时间变化比不同处理间的差异更明显,表明离子调节对这些群落的影响不大。实验期间,浮游植物的优势门为绿藻门、蓝藻门和绿藻门,浮游动物的优势门为纤毛虫门、变形虫门和尾藻门。蓝藻的相对丰度低于传统的生物絮团系统,表明这些微生物在合成系统中具有更高的控制能力。因此,离子调节对浮游生物的影响很小,可能是因为在测试的离子操作下,这些离子没有达到限制。
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引用次数: 1
Integrated multi-biomarker responses in Mozambique tilapia, Oreochromis mossambicus under acute and chronic Diazinon® exposures 急性和慢性暴露于Diazinon®的莫桑比克罗非鱼、莫桑比克罗非鱼的综合多生物标志物反应
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-02-14 DOI: 10.1080/02757540.2023.2178649
Shubhajit Saha, Nimai Chandra Saha, A. Chatterjee, P. Banerjee, Pramita Garai, Pramita Sharma, L. Patnaik, Susri Nayak, K. Dhara, A. Chukwuka, C. Faggio
ABSTRACT The pesticide ecosystem impacts are very diverse, and depending on their persistence could exert their intrinsic toxicity within an acute to a chronic timeframe. This study examined the toxic effects of Diazinon on haematological and biochemical endpoints in Oreochromis mossambicus after chronic exposure. After a prior range fining test, fishes were exposed to predetermined diazinon concentrations (T1-0.906 mg/L) and (T2-1.812 mg/L) and sampled after 28 days for toxicity endpoints. In Diazinon-exposed fish, haemoglobin content, Total Red Blood Cells, Total White Blood Cells, and MCH levels were substantially lower (p < 0.05) than in the control fish group. The total blood glucose concentrations in treated fish were substantially greater (p < 0.05) than in the control group, whereas serum protein concentrations were significantly lower (p < 0.05). Observation for most biomarkers revealed patterns of decreasing values with increasing toxicant concentration and exposure duration. The integrated indices (IBR and BRI) indexes were used to provide visual and understandable depictions of toxicity effects and emphasised the relativity of biomarkers in terms of sensitivity and magnitude or severity of responses under graded toxicant exposures. In acute and chronic diazinon exposure circumstances, the analysed metrics show significant impairment to Oreochromis mossambicus.
农药对生态系统的影响是非常多样化的,并且根据其持久性可以在急性到慢性时间框架内发挥其内在毒性。本研究探讨了二嗪农对慢性暴露后的刺青鱼血液学和生化指标的毒性作用。在预先的范围筛选测试后,将鱼暴露于预先确定的二嗪磷浓度(T1-0.906 mg/L)和(T2-1.812 mg/L)中,并在28天后取样检测毒性终点。与对照组相比,二氮嗪农暴露鱼的血红蛋白含量、总红细胞、总白细胞和MCH水平显著降低(p < 0.05)。处理鱼的总血糖浓度显著高于对照组(p < 0.05),血清蛋白浓度显著低于对照组(p < 0.05)。对大多数生物标志物的观察显示,随着毒物浓度和暴露时间的增加,其值呈下降趋势。综合指数(IBR和BRI)指数用于提供可视化和可理解的毒性效应描述,并强调生物标志物在分级毒物暴露下的敏感性和反应的大小或严重程度方面的相关性。在急性和慢性二嗪农暴露的情况下,分析的指标显示显着的损害莫桑褐条。
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引用次数: 10
Moss biomonitoring of air pollution with potentially toxic elements in the Pelagonia Region, North Macedonia 北马其顿伯拉哥尼亚地区潜在有毒元素空气污染的苔藓生物监测
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-02-14 DOI: 10.1080/02757540.2023.2178650
T. Stafilov, R. Šajn, Ana Puteska, Bojana Dimovska
ABSTRACT This study aims to investigate air deposition and explore the distribution and contamination with potentially toxic elements (PTEs) in the Pelagonia Region, North Macedonia. For this goal, 63 moss samples were collected and analysed by inductively coupled plasma – atomic emission spectrometry to determine the content of 19 major and trace elements. It was found that the atmospheric deposition of some PTEs in the moss samples from specific parts of the study area is influenced by anthropogenic activities. Three factor associations were obtained from multivariance R-method factor analysis: Factor 1 (Al, Ba, Cr, Cu, Fe, Li, Ni, V, and Na) mixed lithogenic and anthropogenic association, Factor 2 (Ca, K, Mg, Na, Cd, and Zn) mostly as a result of complex geology and lithology of the region, and Factor 3 (Pb, Zn, and Ni) which represents an anthropogenic association of the elements mostly present in the air particles emitted from the fly ash landfill of the thermoelectric power plant near the city of Bitola. The external influence of the transport of the particles reached in Ni from the ferronickel smelter plant near the town of Kavadarci was also observed in the northeastern part of the study area.
摘要本研究旨在调查北马其顿Pelagonia地区的空气沉积,并探讨潜在有毒元素(PTEs)的分布和污染。为此,收集了63个苔藓样品,并通过电感耦合等离子体-原子发射光谱法进行分析,以确定19种主要和微量元素的含量。研究发现,研究区特定地区苔藓样品中一些PTE的大气沉积受到人为活动的影响。多元R法因子分析得到三个因子组合:因子1(Al、Ba、Cr、Cu、Fe、Li、Ni、V和Na)混合成因和人为组合,因子2(Ca、K、Mg、Na、Cd和Zn)主要是由于该地区复杂的地质和岩性,以及因子3(Pb、Zn和Ni),其表示主要存在于比托拉市附近热电厂飞灰填埋场排放的空气颗粒中的元素的人为关联。在研究区域的东北部,还观察到Kavadarci镇附近的镍铁冶炼厂输送的镍颗粒的外部影响。
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引用次数: 1
Characterization of suspended microplastics in surface waters of Chalakudy River, Kerala, India 印度喀拉拉邦Chalakudy河地表水中悬浮微塑料的表征
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-02-13 DOI: 10.1080/02757540.2023.2178648
S. K. Maneesh Kumar, A. Kartha, S. Rajathy, C. S. Ratheesh kumar, P. Chandini, P. Vidya, P. K. Madhuraj, K. S. Sajith, S. Anamika
ABSTRACT The investigation focused on identification and quantification of microplastics in surface waters of Chalakudy River, Kerala. Microplastics were detected in the surface waters of the study area with a recovery rate of 108.33 mg particles L−1. The abundance of microplastics ranged from 15.13 ± 4.13 – 170 ± 17.75 particles L−1 (mean: 55.81 ± 34 particles L−1). A maximum number of microplastics were obtained from site C3 and the least from site C8. The weight distribution of microplastic on sites exhibited strong positive correlation with the abundance (r = 0.83). Microplastics of size <20 µm were in higher abundance in the study area. Microscopic examination revealed fragments (47.06%) as predominant plastics and the dominant colour was brown/mud (26.99%). Abundance of coloured plastics indicated the probability of damage to aquatic life. Raman spectrum analysis revealed that Low-Density Poly Ethylene (40%) as the predominant polymer that could be observed at all the sampling sites. Lower-sized microplastics would cause accidental ingestion by organisms. The estimated release of a higher average number of microplastic particles (55.81 ± 4.25) into the marine environment is of serious concern. The observed overall abundance and recovery rate of microplastics in the study area indicated the status of contamination due to a multitude of sources.
摘要本次调查的重点是喀拉拉邦Chalakudy河地表水中微塑料的识别和定量。在研究区域的地表水中检测到微塑料,回收率为108.33 mg颗粒L−1。微塑料的丰度在15.13之间 ± 4.13 – 170 ± 17.75个颗粒L−1(平均值:55.81 ± 34个颗粒L−1)。从C3位点获得的微塑料数量最多,从C8位点获得的最小。微塑料在位点上的重量分布与丰度(r = 0.83)。尺寸小于20的微塑料 µm在研究区域的丰度较高。显微镜检查显示碎片(47.06%)为主要塑料,主要颜色为棕色/泥状(26.99%)。丰富的彩色塑料表明对水生生物造成损害的可能性。拉曼光谱分析显示,在所有采样点都可以观察到低密度聚乙烯(40%)作为主要聚合物。尺寸较小的微塑料会导致生物体意外摄入。更高平均数量的微塑料颗粒的估计释放量(55.81 ± 4.25)进入海洋环境引起严重关注。在研究区域观察到的微塑料的总体丰度和回收率表明了多种来源造成的污染状况。
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引用次数: 0
Effects of increased salinity on oxidative stress status in the freshwater mussel Unio ravoisieri 盐度升高对淡水贻贝氧化应激状态的影响
IF 2.5 4区 环境科学与生态学 Q3 ECOLOGY Pub Date : 2023-01-07 DOI: 10.1080/02757540.2022.2163238
Amal Lassoued, Noureddine Khalloufi, Wiem Saidani, A. Khazri, N. Ghanem-Boughanmi, J. Bouayed, M. Ben-Attia
ABSTRACT Freshwater salinisation is an environmental challenge that threatens freshwater species survival. We investigated the influence of increased water salinity on the oxidative status in the bivalve Unio ravoisieri. Under laboratory conditions, 3 sodium chloride (NaCl) concentrations (2.5, 5 and 7.5) were tested for 7 days compared to a control salinity concentration (0.7), mimicking sampling site condition. Biomarkers of oxidative stress including superoxide dismutase (SOD) and catalase (CAT) activities and glutathione (GSH) and malondialdehyde (MDA) were assessed in gills and digestive gland. Furthermore, acetylcholinesterase (AChE) activity was assessed, as a marker of neurotoxicity. Findings showed that the highest concentration of salinity has significantly disturbed oxidative metabolism in both gills and digestive gland by modulating the activity of CAT and the levels of GSH and MDA compared to the control condition (all p < 0.05). Moreover, significant enhance of AChE activity has been found in both gills and digestive gland with the three concentrations (all p < 0.05), except for 2.5 in gills (p > 0.05) compared to control condition. Overall, our study has shown that water salinity constitutes a serious challenge for Unio ravoisieri, and that CAT activity could be used as a sensitive marker for the evaluation of the effect of freshwater salinisation on freshwater.
摘要淡水盐碱化是威胁淡水物种生存的环境挑战。研究了盐度升高对双壳贝氧化状态的影响。在实验室条件下,与对照盐度浓度(0.7)相比,对3种氯化钠(NaCl)浓度(2.5、5和7.5)进行了为期7天的测试,模拟采样现场条件。氧化应激的生物标志物包括超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性以及谷胱甘肽(GSH)和丙二醛(MDA)。此外,评估乙酰胆碱酯酶(AChE)活性,作为神经毒性的标志。结果表明,与对照组相比,最高盐度通过调节CAT活性、GSH和MDA水平,显著扰乱了鱼鳃和消化腺的氧化代谢(p < 0.05)。总的来说,我们的研究表明,水的盐度对union ravoisieri构成了严重的挑战,CAT活性可以作为评估淡水盐碱化对淡水影响的敏感标志。
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引用次数: 3
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Chemistry and Ecology
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