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南淝河表层沉积物中多氯联苯的分布、来源及生态风险评价
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摘要
本文以巢湖最大的入湖河流南淝河沉积物为研究对象,利用GC-MS测定南淝河表层沉积物中多氯联苯(PCBs)的含量,主要阐述了南淝河表层沉积物中多氯联苯的残留情况,并运用美国国家环保署法(EPA法)和加拿大沉积物环境质量标准(SQG)对沉积物进行了风险性评价。结果表明,PCBs在南淝河表层沉积物中普遍存在,有22种同系物被检出,属于9类多氯联苯,尤其以二氯联苯、五氯联苯和六氯联苯类为主,主要来源是其流域周围与油漆、绝缘材料的有关工业产业以及大气沉降。南淝河表层沉积物中多氯联苯污染情况具有很高的风险性,对流域内生物生长具有很大威胁。
In this study, the surface sediments of Nanfei River, known as the largest inflowing river of Chaohu Lake, was examined to detect the concentration of Polychlorinated Biphenyls(PCBs) using gas chromatography-mass spectrometry(GC-MS). Then the residual PCBs in surface sediments and following risk assessment according to U.S. Environmental Protection Agency(EPA) methods and Sediment quality guideline(SQG) were descried. As a result, PCBs were common in surface sediments of Nanfei River with 22 kinds of homologuesdetected classified as 9 categories. Among the homologues, the most were dichloro-diphenyl, pentachlorobiphenyl and hexachlorobenzene and mainly result from industries concerning paint and insulation materials, and atmospheric deposition around the water body. What's more, the PCBs pollution in surface sediments of Nanfei River was of high risk, threatening the growth of living things within the water body.
引文
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