College of Water Sciences, Beijing Normal University, Beijing 100875, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Anwai, Beiyuan, Beijing 100012, China.
National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Anwai, Beiyuan, Beijing 100012, China.
Chemosphere. 2019 Mar;218:1114-1121. doi: 10.1016/j.chemosphere.2018.11.164. Epub 2018 Nov 30.
Increasing attention is being paid to Sb as a primary hazardous substance, and further systematic studies of Sb behavior in freshwater wetlands are required. The plain wetlands in Lake Taihu basin located in lower Yangtze River valley, are heavily populated and economically developed area in China. The plain wetlands receive polluted water from point sources (textile and printing plants). In this study, Sb speciation in plain wetlands was investigated and the potential ecological risk of 8 metal(loid)s (As, Cd, Cr, Cu, Ni, Pb, Zn, Sb) were assessed. The mean Sb concentration in the wetlands water is 7.03 μg L, which consist of pentavalent, trivalent, organic Sb dissolved in water and a great part that attached to suspend solids (SS). Statistical analysis indicated that Sb(Ⅲ) is dissolved from SS and then further oxided to Sb(V) accompanied with tailing water discharged into wetlands; presence of organic Sb is related to microorganic in eutrophic environment; precipitation of SS is the dominant factor for distribution of bioavailable Sb in surficial sediment. The toxicity coefficient factor for Sb is proposed as 10 and ambient background of 8 metal(loid)s are set up. The potential ecological risk for plain wetlands was 135, which was low level. As, Cd and Sb were main contributors to the ecological risks. The wetlands are threatened by Sb pollution, which should be restrict by reducing the concentration of SS and Sb in tailing water from local water treatment facilities.
人们越来越关注 Sb 作为一种主要的有害物质，因此需要进一步对 Sb 在淡水湿地中的行为进行系统研究。太湖流域平原湿地位于长江下游地区，是中国人口稠密和经济发达的地区。这些平原湿地接收来自点源（纺织和印刷厂）的污染水。本研究调查了平原湿地中的 Sb 形态，并评估了 8 种金属（As、Cd、Cr、Cu、Ni、Pb、Zn 和 Sb）的潜在生态风险。湿地水中的 Sb 平均浓度为 7.03μg/L，包括五价、三价、溶于水的有机 Sb 和大部分附着在悬浮固体（SS）上的 Sb。统计分析表明，Sb(Ⅲ)从 SS 中溶解出来，然后进一步氧化为 Sb(V)，并随着废水排入湿地；有机 Sb 的存在与富营养化环境中的微生物有关；SS 的沉淀是表层沉积物中可利用 Sb 分布的主要因素。建议将 Sb 的毒性系数因子设定为 10，并建立 8 种金属（loid）的环境背景值。平原湿地的潜在生态风险为 135，处于低水平。As、Cd 和 Sb 是生态风险的主要贡献者。湿地受到 Sb 污染的威胁，应通过减少当地水处理厂尾水中的 SS 和 Sb 浓度来加以限制。
