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The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China
Li, Liqing; Chen, Xinghong; Zhang, Meiyi; Zhang, Weijun; Wang, Dongsheng; Wang, Hongjie
2021-12-19
Source PublicationENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN0301-4797
Volume297Pages:-
AbstractThis study comprehensively analyzes the environmental risk of heavy metals (HMs) in the dewatering process of dredged sediment. First, the toxicity leaching capacity, total content, and chemical speciation of the HMs (As, Cd, Co, Cr, Cu, Hg, Mo, Pb, Sb, Sr, Tl, Zn) in dewatered sediment were determined using toxicity characteristic leaching procedure and modified Community Bureau of Reference sequential extraction procedure. The ecotoxicity and environmental risk of the HMs were then evaluated based on sediment quality guidelines, geoaccumulation index, enrichment factor, potential ecological risk, and risk assessment code. The results showed that flocculants reduced the ecological risk of Hg and Mo in sediment, and promoted the transformation of Mo, Sb, and Tl from the biologically active fraction to the more stable fraction. The transformation percentages of Mo, Sb, and Ti were 45.15%, 50.59% and 76.44%, respectively, after chitosan (CTS) treatment, and 64.55%, 31.75% and 99.90%, respectively, after cationic polyacrylamide (CPAM) treatment. CTS reduced the potential risks of bioavailable As, Cr, Cu, Mo, Sb, and Hg by (at most) 46.28%, 45.92%, 43.01%, 100.00%, 44.45%, and 39.69%, respectively, whereas CPAM decreased the ecotoxicity of bioavailable Cd, Co, and Zn by (at most) 27.49%, 16.10%, and 20.89%, respectively. According to the result of principal component analysis, the main factors affecting the environmental risk of HMs in sediment dewatering were nitrogenous organic compounds (mainly protein substances), fulvic acid substances, and minerals. The most essential factor was nitrogenous organic compounds, which accounted for 89.52% of the total variance. Chemical speciation was apparently more suitable for environmental risk assessment of sediment dewatering than total content. This study provides an important basis for controlling the environmental risk of HMs caused by sediment dewatering.
Department环境水质学国家重点实验室
KeywordDewatering Chemical speciation Principal component analysis Risk assessment
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46867
Collection环境水质学国家重点实验室
Affiliation1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
3.Hebei Univ, Xiongan Inst Ecoenvironm, Banding 071002, Peoples R China
Recommended Citation
GB/T 7714
Li, Liqing,Chen, Xinghong,Zhang, Meiyi,et al. The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2021,297:-.
APA Li, Liqing,Chen, Xinghong,Zhang, Meiyi,Zhang, Weijun,Wang, Dongsheng,&Wang, Hongjie.(2021).The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,297,-.
MLA Li, Liqing,et al."The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 297(2021):-.
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