非离子有机物淡水沉积物质量基准推导方法——以林丹为例
作者简介:
钟文珏(1979-),女,博士,研究方向为水环境质量基准与生态风险评价,E-mail:wenjue07@126.com
- 南开大学环境科学与工程学院教育部环境污染过程与基准重点实验室天津城市生态环境修复与污染防治重点实验室
摘要: 沉积物质量基准是对水质基准的补充,对水质管理有重要意义。国际上有多种建立沉积物质量基准的方法,其中,相平衡分配法是美国环境保护局推荐使用的方法之一。相平衡分配法利用污染物的沉积物-水平衡分配系数(Kp)和水质基准中污染物的最终慢性毒性值(FCV)计算污染物的沉积物质量基准值(SQC)。当缺乏污染物的沉积物生物毒性效应数据时,该方法是行之有效的方法,并适用于计算foc>0.2%的沉积物中logKow≥3的非离子有机物沉积物质量基准(foc为沉积物中有机碳含量,Kow为辛醇/水分配系数)。本文以林丹为例,对利用相平衡分配原理计算非离子有机物淡水沉积物质量基准的方法进行了阐述,并最终得出林丹的淡水沉积物质量基准值为0.019μg·g-1(以干质量计),有机碳含量标准化后的林丹沉积物质量基准值为1.65μg·g-1(以单位质量的有机碳计),该结果明显高于北美地区林丹的沉积物质量基准值。物种分布差异是造成不同区域同一污染物沉积物基准差异的重要因素之一。
Development of Freshwater Sediment Quality Criteria for Nonionic Organics——Using Lindan as an Example
- Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education, Tianjin Key Laboratory of Remediation&Pollution Control for Urban Ecological Environment, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
- Received Date:
2011-05-20
Fund Project:
Abstract: Sediment quality criteria(SQC) are the supplement of current water quality criteria and are very important in water quality management.Among many approaches for deriving SQC in the world,equilibrium partitioning(EqP) is a rational approach to derive SQC for nonionic organics when the toxicity data in sediment are lacking.For EqP method,solid-liquid equilibrium distribution coefficient(Kp) and final chronic value(FCV) of nonionic organics are used to derive SQC.This method is applicable for nonionic organics with logKow≥3 and foc>0.2%,in which Kow is octanol/water partition coefficient and foc is the fraction of organic carbon in sediment.In this paper,lindan was used as an example to demonstrate the procedure to derive SQC by EqP approach.The SQC for lindan derived by EqP approach is 0.019 μg·g-1(calculated on dry weight basis) and the organic carbon normalized SQC is 1.65 μg·g-1.It is higher than the SQC for lindan in North America.Species difference is one of the main reasons for the difference among SQC for the same chemical in different regions.
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