Pollution characteristics and ecological risk assessment of heavy metals in the surface sediments from a source water reservoir

Q3 Chemical Engineering Chemical Speciation and Bioavailability Pub Date : 2016-07-12 DOI:10.1080/09542299.2016.1206838

Changming Yang, Yaqiong Wu, Fen Zhang, Lin Liu, Rui-Jie Pan

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引用次数: 21

Abstract

Abstract Surface sediment samples were collected from a source water reservoir in Zhejiang Province, East of China to investigate pollution characteristics and potential ecological risk of heavy metals. The BCR sequential extraction method was used to determine the four chemical fractions of heavy metals such as acid soluble, easily reducible, easily oxidizable and residual fractions. The heavy metals pollution and potential ecological risk were evaluated systematically using geoaccumulation index (Igeo) and Hakanson potential ecological risk index (H′). The results showed that the sampling sites from the estuaries of tributary flowing through downtowns and heavy industrial parks showed significantly (p < 0.05) higher average concentrations of heavy metals in the surface sediments, as compared to the other sampling sites. Chemical fractionation showed that Mn existed mainly in acid extractable fraction, Cu and Pb were mainly in reducible fraction, and As existed mainly in residual fraction in the surface sediments despite sampling sites. The sampling sites from the estuary of tributary flowing through downtown showed significantly (p < 0.05) higher proportions of acid extractable and reducible fractions than the other sampling sites, which would pose a potential toxic risk to aquatic organisms as well as a potential threat to drinking water safety. As, Pb, Ni and Cu were at relatively high potential ecological risk with high Igeo values for some sampling locations. Hakanson potential ecological risk index (H′) showed the surface sediments from the tributary estuaries with high population density and rapid industrial development showed significantly (p < 0.05) higher heavy metal pollution levels and potential ecological risk in the surface sediments, as compared to the other sampling sites.

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某水源水库表层沉积物重金属污染特征及生态风险评价

摘要以浙江省某水源水库表层沉积物为研究对象，探讨其重金属污染特征及潜在生态风险。采用BCR顺序萃取法测定了重金属的酸溶性、易还原性、易氧化性和残留4个化学组分。采用地质累积指数(Igeo)和Hakanson潜在生态风险指数(H’)对重金属污染和潜在生态风险进行了系统评价。结果表明:城区和重工业园区支流河口的表层沉积物重金属平均浓度显著高于其他采样点(p < 0.05);化学分馏表明，在不同取样地点的表层沉积物中，Mn主要存在于酸萃取组分中，Cu和Pb主要存在于可还原组分中，As主要存在于残留组分中。经市区支流入海口采样点酸性可提取和可还原组分的比例显著(p < 0.05)高于其他采样点，对水生生物具有潜在的毒性风险，对饮用水安全构成潜在威胁。As、Pb、Ni和Cu在部分采样点具有较高的Igeo值，具有较高的潜在生态风险。Hakanson潜在生态风险指数(H’)显示，人口密度高、工业发展快的支流河口表层沉积物重金属污染水平和潜在生态风险显著高于其他样点(p < 0.05)。

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来源期刊

Chemical Speciation and Bioavailability 环境科学-毒理学

CiteScore

1.62

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： Chemical Speciation & Bioavailability ( CS&B) is a scholarly, peer-reviewed forum for insights on the chemical aspects of occurrence, distribution, transport, transformation, transfer, fate, and effects of substances in the environment and biota, and their impacts on the uptake of the substances by living organisms. Substances of interests include both beneficial and toxic ones, especially nutrients, heavy metals, persistent organic pollutants, and emerging contaminants, such as engineered nanomaterials, as well as pharmaceuticals and personal-care products as pollutants. It is the aim of this Journal to develop an international community of experienced colleagues to promote the research, discussion, review, and spread of information on chemical speciation and bioavailability, which is a topic of interest to researchers in many disciplines, including environmental, chemical, biological, food, medical, toxicology, and health sciences. Key themes in the scope of the Journal include, but are not limited to, the following “6Ms”: Methods for speciation analysis and the evaluation of bioavailability, especially the development, validation, and application of novel methods and techniques. Media that sustain the processes of release, distribution, transformation, and transfer of chemical speciation; of particular interest are emerging contaminants, such as engineered nanomaterials, pharmaceuticals, and personal-care products. Mobility of substance species in environment and biota, either spatially or temporally. Matters that influence the chemical speciation and bioavailability, mainly environmentally relevant conditions. Mechanisms that govern the transport, transformation, transfer, and fate of chemical speciation in the environment, and the biouptake of substances. Models for the simulation of chemical speciation and bioavailability, and for the prediction of toxicity. Chemical Speciation & Bioavailability is a fully open access journal. This means all submitted articles will, if accepted, be available for anyone to read, anywhere, at any time. immediately on publication. There are no charges for submission to this journal.