【摘要】 2011年5月采集莱州湾及东营近岸海域鱼、贝、甲壳(蟹、虾)、头足四类235个生物体样品,用气相色谱法测定其中六六六(HCHs)、滴滴涕(DDTs)及多氯联苯(PCBs)含量,对其残留水平、分布、组成特征及污染源进行分析,对污染现状及人体健康风险进行了评价。结果表明,研究海域生物体中HCHs含量(湿重)N.D.—5.73 g/kg;DDTs含量(湿重)0.122—304 g/kg;PCBs含量(湿重)N.D.—6.51 g/kg。根据各同分异构体百分比组成分析,莱州湾及东营近岸海域近期无新的大面积HCHs、DDTs污染输入。与同类研究相比,莱州湾及东营近岸海域生物体PCBs含量处于较低水平,而HCHs和DDTs含量处于中间水平。通过污染指数分析得出:所有生物体HCHs、PCBs均未受到污染;55%生物体DDTs受到不同程度污染。研究海域生物体HCHs、DDTs、PCBs含量低于各国食品安全限量;以美国环保局推荐方法评价本海域生物体HCHs、PCBs食用致癌风险为可接受风险,但是DDTs含量存在一定的致癌风险。更多还原

【Abstract】 In May 2011, some 235 organisms(including fish, mollusk, crustacean, and octopus) were collected from the Laizhou Bay off Dongying City, Bohai Sea, North China. Residues of hexachlorocyclohexane(HCHs), dichloro-diphenyl- trichloroethane(DDTs), and polychlorinated biphenyls(PCBs) were detected in gas chromatography. The residue levels, distribution characteristics and composition of HCHs, DDTs, and PCBs were scored; and the risk to human health were assessed. The results show that, concentrations of HCHs, DDTs, and PCBs in the organisms ranged from ND(not detect- able)—5.73, 0.122—304, and ND—6.51 g/kg in wet weight, respectively. Deduced by the component rations of isomers, there was no new HCHs pollution in the study area, but new DDTs in two sites. Compared with the other studies, the PCBs levels in the organisms in the areas were the lowest, while the HCHs and DDTs were in the middle levels. The pollution indexes of HCHs and PCBs were below 0.5, indicating that the organisms in this area had not been polluted by HCHs and PCBs. Fifty-five percent of the pollution indexes of DDTs ranged from 0.512—30.4, which means that 55% of the organ- isms from the studied area had been more or less polluted by DDTs. The residue levels of HCHs, DDTs, PCBs were below the maximum residual limits that adopted internationally. Assessed with the method suggested by EPA, in the case of the study areas, the carcinogenic potential arising from the exposure to HCHs and DDTs by intake of these organisms was within the acceptable range.更多还原