福建武夷山北段土壤中有机氯农药的残留及空间分布

Distribution characteristics of organochlorine pesticides in soil samples from the northern Wuyi Mountains,Fujian,Southeast China

于2009年3月采集福建武夷山北段106个表层土壤样品,并用气相色谱（GC-ECD）内标法分析其有机氯农药（OCPs）的含量,探讨了研究区土壤中OCPs的残留水平、空间分布及来源.结果表明,该区土壤中HCHs及DDTs的异构体或衍生物的检出率在82.1%～100%之间,土壤中HCHs、DDTs的检出率高达100%.HCHs和DDTs含量范围（平均值）分别为1.05～25.07ng/g（3.98ng/g）,0.01～107.99ng/g（7.48ng/g）.通过与南极、西藏地区等地区土壤含量比较,该地区土壤中OCPs含量属于低污染区.不同土地利用类型中,土壤中总OCPs含量排序为：水田〉蔬菜地〉林地.来源分析表明该地区HCHs污染主要来源于历史使用,而DDTs近年来仍有输入,这可能与DDT的替代品-三氯杀螨醇的使用有关.

106 soil samples were collected from the northern Wuyi Mountains.The concentrations of OCPs in the samples were determined by GC-ECD with the internal standard method.The results showed that HCHs and DDTs were found widely in all samples and the concentrations of HCHs,DDTs in soils of the northern Wuyi Mountains were in the ranges of 1.05~25.07 ng/g（with a mean 3.98 ng/g）,0.01~107.99 ng/g（with a mean 7.48 ng/g）,respectively.The residue level in different lands was in the order as follows： paddy field vegetable land woodland.The results also showed that the soils in the study area have polluted lightly by DDTs,but not been polluted by HCHs.Compared to the reference data of Antarctic and Tebat area,the status of this area can be called ＂low pollution＂.Through source analysis,β-HCH was the major source of HCHs.The results indicated that HCHs in this area were historical application.But,new DDTs（dicofol） could be used recently in this area.