滇池沉积物金属污染及环境质量评价

Metal contamination and quality assessment of Lake Dianchi sediment

对滇池126个采样点沉积物0-5cm、5-10cm和10-20cm中Cu、Zn、Pb、Cr、Cd、Hg和As等7种金属的含量进行了分析测定.用基于多方的基准中阈值效应含量TEC和可能效应含量PEC划分出5个沉积物环境质量等级,并借助灰色聚类分析方法对滇池沉积物环境质量进行了评价.结果表明,滇池沉积物环境质量整体上为Ⅲ类,存在中度的金属污染.其中0-5cm和5-10cm为Ⅲ类沉积物,10-20cm为Ⅱ类沉积物.沉积物环境质量下层优于上层,表明滇池沉积物金属污染仍存在不断加剧的趋势.

Sediment samples collected at 126 sites in Lake Dianchi were analyzed to determine their metal concentrations of copper, zinc, lead, cadmium, chromium, mercury, and arsenic at different depths of the sediment cores （0-Scm, 5-10cm and 10-20cm）. Based upon the consensus-based sediment quality guidelines （CBSQGs）, the threshold effect concentration （TEC） and the probable effect concentration （PEC）, five sedimentary environment quality grades were classified and assessed by employing the method of the grey clustering analysis. Results showed that sedimentary environment quality in Lake Dianchi is mostly in the third grade （III） with a moderate metal contamination. Sediments are the third grade （III） at the depths of 0-Scm and 5-10cm, and the second grade （II） at the depth of 10-20cm. Generally, sedimentary environment qualities in the deeper layers are better than in the upper layers, indicating that metal contamination in Lake Dianchi sediments trends towards worse.