• 关键词：相平衡分配法  生物有效性  沉积物环境质量评价  滇池

• 基金项目：土壤与农业可持续发展国家重点实验室重点项目(No.5022505);国家自然科学基金项目(No.40771128)

• 陈云增
• 1. 河南大学环境与规划学院, 开封 475001; 2. 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 杨浩
• 南京师范大学地理科学学院, 南京 210097

• 张振克
• 南京大学海岸与海岛开发教育部重点实验室, 南京 210093

• 秦明周
• 河南大学环境与规划学院, 开封 475001

• 金峰
• 中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京 210008

• 摘要：对滇池8个采样点沉积物固相和间隙水中的金属含量进行分析测定,用实测方法计算Cu、Zn、Pb、Cr、Cd、Hg、As等7种金属在滇池沉积物中的分配系数Kp,利用相平衡分配法和国家地表水环境质量标准(GB3838-2002)中的Ⅲ类水质标准确定了滇池沉积物环境质量基准.重点探讨了沉积物中的细颗粒物质(<63μm)、酸可挥发性硫化物(AVS)、有机碳(TOC)等主要金属结合相对基准的校正方法.通过对118个样点沉积物中各金属的含量与确定的滇池沉积物环境质量基准值进行比较,结果表明,滇池沉积物存在较为严重的As、Cu、Zn、Cr污染,Pb、Cd污染有扩大的趋势.在外源污染得到控制、水质得到改善的情况下,滇池沉积物会成为内在的金属污染源.

• Abstract：Eight Sediment samples and corresponding interstitial water were collected from various sites in Dianchi Lake to determine metal concentrations and partitioning coefficient(Kp) for copper, zinc, lead, cadmium, chromium, mercury, and arsenic. With equilibrium partitioning approach and the state water quality criteria GB3838-2002, Ⅲ, sediment quality guidelines for metals in Dianchi Lake were derived. The study focused on the normalization methods for sediment quality guidelines by the primary binding phases for metals in sediment including fine material(<63μm), acid volatile sulfide (AVS), and organic carbon (TOC). For the assessment of Dianchi Lake sediment quality, metal concentrations in 118 sediment samples were analyzed and compared with the normalized Dianchi Lake sediment quality guidelines. The results indicated that there were relatively severe contaminations of arsenic, copper, zinc and chromium in Dianchi Lake sediment, a high cadmium and lead accumulation had also occurred. With the improvement of water quality, metals could be released from sediment to overlying water.

• Key words：equilibrium partitioning approach  bioavailability  sediment quality assessment  Dianchi Lake

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