重金属-有机物复合污染土风险评价新方法  

A NEW RISK ASSESSMENT METHOD FOR HEAVY METAL ORGANIC COMPOUND POLLUTED SOIL

作　　者：丰土根[1] 郑柳钦 张箭 韦扬 FENG Tugen;ZHENG Liuqin;ZHANG Jian;WEI Yang(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024

出　　处：《环境工程》2023年第7期222-228,共7页Environmental Engineering

基　　金：国家自然科学基金(52178386);中央高校基本科研业务费专项资金(B220202016)。

摘　　要：传统指数风险评价方法将重金属的总量作为确定污染土环境风险评价对象,存在低估重金属污染程度的不足。针对此,提出了一种以重金属有效态为评价对象的改进型潜在生态风险评价方法,该方法可同时考虑数据离散性和生物有效性,并且量化了挥发性有机物的污染风险。以盐城市大丰区某化工企业区域污染土对研究对象,对比分析了传统指数风险评价方法和改进的潜在生态风险评价方法对污染程度评价结果。结果表明:改进的潜在生态评价方法切实可行,该方法的评价结果显示Cr、Cu元素均呈现四级生态危害程度,Pb元素呈现强生态危害程度,而Co元素和VOCs的潜在生态风险系数E_(i)^(r)达到极强,该污染土的潜在生态风险指数RI为4613.43,为极强生态危害程度。The traditional index risk assessment method takes the total amount of heavy metals as the object of determining the environmental risk assessment of contaminated soil,which may underestimate the pollution degree of heavy metals.In this paper,an improved potential ecological risk assessment method based on the available state of heavy metals is proposed.This method can consider both the data discreteness and biological availability,and quantify the pollution risk of volatile organic compounds.Aiming at the regional polluted soil of a chemical enterprise in Dafeng District,Yancheng,the traditional index risk assessment method and the improved potential ecological risk assessment method were compared and analyzed.The results showed that the improved potential ecological assessment method was feasible.The assessment results of the improved method showed that Cr and Cu elements presented a forth level ecological hazard degree,Pb element presented a strong ecological hazard degree,while the potential ecological risk coefficient of Co elements and VOCs reached a very strong ecological hazard degree.The potential ecological risk index RI of the contaminated soil was 4613.43,a very strong ecological hazard degree.

关 键 词：改进的潜在生态风险评价方法 重金属有效态 重金属-有机物复合污染土 可靠性验证 风险评价 

分 类 号：X53[环境科学与工程—环境工程] X820.4