Han Chao-nan, Qin Yan-wen, Zheng Bing-hui, Zhang Lei, Cao Wei
State Environmental Protection Key Laboratory of Estuary and Coastal Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2013 May;34(5):1715-24.
Twenty-nine surface sediment samples were collected from Hengyang sections of Xiangjiang River to detect concentrations and speciation percentage of heavy metals (Cu, Pb, Zn and Cd) in sediment and pore water. According to the Equilibrium Partitioning (EqP) approach, the sediment-water partition coefficients (Kp) of heavy metals in Hengyang section of Xiang River were revised by the bioavailable fraction, and the USEPA Criterion Continuous Concentration(CCC) which was based on aquatic toxicity of the final chronic level and GB3838-2002 I ,water quality standard were introduced to establish two types of sediment quality criteria (SQC) for heavy metals (Cu, Pb, Zn and Cd) in Hengyang section of Xiangjiang River for comparison. The better SQCs (base on CCC) of Cu, Pb, Zn and Cd were 64.62, 55.57, 1 360.40 and 2.34 microg x g(-1), and they can protect benthic organism from being poisoned by heavy metal chronic aquatic toxicity. The ratio of heavy metal concentration and SQC was used to assess sediment quality in Hengyang section of Xiangjiang River, the result showed that concentration levels of Cd, Pb in sediment in Hengyang section of Xiangjiang River had strong chronic toxic effects, Cd pollution could not be ignored.
采集了湘江衡阳段29个表层沉积物样本，以检测沉积物和孔隙水中重金属（铜、铅、锌和镉）的浓度及形态百分比。根据平衡分配（EqP）方法，利用生物可利用分数对湘江衡阳段重金属的沉积物-水分配系数（Kp）进行修正，并引入基于最终慢性毒性水平的水生毒性的美国环保署标准连续浓度（CCC）和GB3838-2002Ⅰ类水质标准，建立了湘江衡阳段重金属（铜、铅、锌和镉）的两种沉积物质量标准（SQC）进行比较。铜、铅、锌和镉较好的SQC（基于CCC）分别为64.62、55.57、1360.40和2.34μg·g-1，它们可以保护底栖生物免受重金属慢性水生毒性的毒害。利用重金属浓度与SQC的比值对湘江衡阳段沉积物质量进行评价，结果表明，湘江衡阳段沉积物中镉、铅的浓度水平具有较强的慢性毒性效应，镉污染不容忽视。
