贵州省某市土壤中有机氯残留及风险评价

Residues and Risk Assessment of Soil OCPs in a City of Guizhou Province

运用气相色谱法和生态分析评价法对贵州某市三县区土壤样品中有机氯残留及可能存在的生态风险进行分析。结果显示:该地区土壤中有机氯农药残留以六六六和滴滴涕为主:六六六残留量为ND^4.907μg kg-1,均值为0.303μg kg-1;滴滴涕残留量为0.115~29.900μg kg-1,均值为3.360μg kg-1,滴滴涕均值较六六六高。土壤中有机氯浓度及代谢物表明,滴滴涕和六六六主要来自历史性输入,六氯苯来自大气沉降输入。利用RBCA健康风险评价模型对土壤中有机氯污染物进行评价,结果表明该地区土壤中有机氯对人体健康风险较低。

To determine the residues of OCPs and evaluate the potential ecological risk in the soil, the samples were collected from three counties in Guizhou Province and eleven kinds of OCPs were quantified by gas chromatography.The results showed that the major components of OCPs residues were DDTs and HCHs. The concentration of DDTs residues was higher than that of HCHs. The concentration of HCHs in the soil was in the range of ND- 4.907 μg kg-1,with an average of 0.303 μg kg-1, while the concentration of DDTs ranged from 0.115 to 29.900 μg kg-1, with an average of 0.303 μg kg-1. The concentrations and the metabolins of OCPs indicated that the residues of HCHs and DDTs in the soil were mainly originated from the early residues, while the hexachlorobenzene was mainly from the atmospheric deposition. The results from RBCA health risk evaluation model demonstrated that the health risk caused by OCPs was low.