广西岩溶地下河水体中有机氯农药浓度分布特征研究

摘要

The residues of organochlorine pesticides (OCPs) in underground river of Guangxi typical karst area were detected by GC-ECD. Results showed that the concentration of OCPs ranged 0.09-16.17 ng/L with the average value of 6.47 ng/L; the concentration of DDTs ranged from 0.09 ng/L to 9.10 ng/L with the average value of 2.91 ng/L,the maximum value was found in Jila export. The concentration of HCHs was higher than that of DDTs, the concentration of HCHs ranged ND-14.21 ng/L with average value of 3.55 ng/L. The OCPs in northern region of Guangxi was slightly higher than that in south. Compared with other famous river in the world, the concentration of OCPs in the typical karst area in Guangxi was at normal or low level. However, the underground river was directly used as drinking water,so the OCPs pollution in karst underground river of Guangxi was still serious.%利用气相色谱检测器(GC-ECD)对广西典型岩溶区地下河水体中有机氯农药(OCPs)进行检测.结果表明:(1)广西典型岩溶区地下河水体中OCPs均有不同程度检出.岩溶地下河水体中OCPs质量浓度为0.09～16.17ng/L,均值为6.47 ng/L;水体中滴滴涕(DDTs)质量浓度为0.09～9.10 ng/L,均值为2.91 ng/L;水体中六六六(HCHs)质量浓度为ND～14.21ng/L,均值为3.55 ng/L.(2)广西北部的鸡喇地下河及坡心地下河水体中OCPs浓度要高于南部的其他地下河.(3)与国内外著名河流相比较发现,广西典型岩溶区地下河水体OCPs含量处于中低水平.地下河是介于地表河流与饮用水之间的一种特殊水体环境,因此广西岩溶地区地下河的OCPs污染形势还是很严峻的.