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在南方某癌症高发县5个乡镇10个村进行布点取样,采集深层地下水与浅层地下水共计20个水样。采用吹扫捕集与气相色谱-质谱联用方法测定水样中13种挥发性有机物(VOCs),检出二氯甲烷、三氯甲烷、苯和四氯化碳4种VOCs,其浓度分别为0.36—13.52、0.41—18.71、0.57—11.75μg/L和1.56—214.62μg/L。1个水样中苯和16个水样中四氯化碳超过GB 5749-2006规定的限值。采用优化的USEPA风险评价模型,对VOCs进行人体健康风险评价,其非致癌风险指数0.0073—0.7100,致癌风险水平1.98×10-6—1.99×10-4,全部水样的致癌风险水平超过10-6水质监控值,1个水样的致癌风险水平超过10-4的可接受水平。四氯化碳对非致癌风险指数和致癌风险水平贡献最大。
In a southern country with a high incidence of cancer counties in 10 towns and villages of 5 villages were sampled for sampling and a total of 20 water samples were collected from deep groundwater and shallow groundwater. Thirteen kinds of volatile organic compounds (VOCs) were determined by the method of purge and trap combined with gas chromatography-mass spectrometry (GC-MS), and four kinds of VOCs such as dichloromethane, trichloromethane, benzene and carbon tetrachloride 0.36-13.52, 0.41-18.71, 0.57-11.75 μg / L, and 1.56-214.62 μg / L. CTC in benzene and 16 water samples in one water sample exceeds the limit specified in GB 5749-2006. Using the optimized USEPA risk assessment model, the human health risk assessment of VOCs was conducted. The non-cancer risk index was 0.0073-0.7100, the carcinogenic risk level was 1.98 × 10-6-1.99 × 10-4, and the carcinogenic risk level of all water samples exceeded 10- 6 Water quality monitoring values, one water-borne carcinogenic level that exceeds the acceptable level of 10-4. Carbon tetrachloride has the largest contribution to the non-carcinogenic risk index and the carcinogenic risk level.