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Speciation, Distribution and Risk Assessment of Metals in Sediments from a Water Body Replenished by Effluent from a Wastewater Treatment Plant

Wang, Nan, Wang, Xiaochang C., Liu, Honglei, Zheng, Yucong, Zhang, Yan, Xiong, Jiaqing, Pan, Pan, Liu, Yanzheng
Bulletin of environmental contamination and toxicology 2019 v.102 no.4 pp. 525-530
adverse effects, arsenic, cadmium, carbonates, chromium, copper, fractionation, iron, lakes, landscapes, lead, manganese oxides, nickel, organic matter, pollution, risk, risk assessment, sediments, surface water, toxicity, wastewater treatment, wetlands, zinc, China
To assess the status and risk of metal pollution in landscape water body replenished by wastewater treatment plant effluent, the distribution of metals in sediments from three regions [regulation pond (RP), wetland lake (WL), and main lake (ML)] of Harbor Lake, Tianjin, China, was characterized. Higher levels of all metals (except Cr and Pb) were observed in RP sediments. As, Cr, Cu, Ni, Pb, and Zn were mainly bound to organic matter and sulfide (F3) and residual fractions (F4), while the exchangeable and carbonate fraction (F1) and Fe/Mn oxide fraction (F2) were the dominant forms for Cd. Additionally, finding showed that the overall risk of sediments in aquatic systems was affected by both metal toxicity and metal fractionation. Thus, according to a modified risk assessment code (RAC), the potential adverse effect of metals in sediments was medium (although As, Cd, Ni, and Zn had high mobility risks based on the RAC), decreasing in the order RP > WL > ML.