我国西南岩溶地区有机氯农药空间分布研究

Distribution and health risk assessment of organochlorine pesticides in underground rivers in karst area,southwest China

利用GC-ECD对我国西南岩溶区地下河水体中有机氯农药(OCPs)进行检测,利用Mapgis等值线图进行数据化分析,并进行简要健康风险评价。结果表明:(1)岩溶地下河水体中OCPs质量浓度为0.10～92.96 ng/L,均值为27.88 ng/L;水体中DDTs质量浓度为0.05～63.85 ng/L,均值为15.11 ng/L;水体中HCHs质量浓度为N.D～51.31 ng/L,均值为12.77 ng/L,各种污染物浓度分布不均。(2)通过等值线图可以看出,OCPs含量整体体现为北部>南部,沿海>内陆,高山丘陵>平原的总体趋势,这主要是与有机氯农药特性有关;局部地区含量异常主要原因是农业及农业相关生产导致。地下河是介于地表河与饮用水之间的一种特殊水体环境,我国西南岩溶地区地下河的OCPs污染形势很严峻。

The residues of organochlorine pesticides （OCPs） in underground river of karst area were detected by GC-ECD in southwest china, and health risks were assessed by USEPA exposure assessment model. The results showed that： （1） the total concentrations of OCPs in underground rivers were in the range of 0.10-92.96 ng/L,aveaage was 27.88 ng/L; The total concentrations of DDTs were in the range of 0.05 - 63.85 ng/L,aveaage was 15.11 ng/L; The total concentrations of HCHs were in the range of N.D-51.31 ng/L,aveaage was 12.77 ng/L; The concentration of various pollutants were not average.（2）Through the contour map could be seen, OCPs reflected the overall content of the north 〉 south, coast 〉 inland, mountains and hills 〉plain, it was mainly concerned with the characteristics of organochlorine pesticides; the agricultural and agriculture-related cause the abnormal. Underground river is a special water environment between the river and the drink water, so situation is still very serious in the underground river in southwest China.