摘要
为了研究太原市污灌区地表土中有机氯农药(OCPs)分布特征,本文在太原小店区共采集了31个地表土样,应用气相色谱-电子捕获检测器(GC-ECD)检测土壤中OCPs的含量.结果表明,研究区地表土中OCPs污染较轻,总OCPs浓度范围为2.01—47.20 ng.g-1(平均值为16.76 ng.g-1).其中总滴滴涕(∑DDT)浓度范围为0.27—37.93 ng.g-1(平均值为8.38 ng.g-1),总六六六(∑HCH)浓度范围为0.18—11.89 ng.g-1(平均值为3.37 ng.g-1),最高浓度均没有超过《土壤环境质量标准》(GB15618—1995)中的Ⅱ级标准(农业土地).不同灌溉区OCPs浓度平均值顺序为:污灌区>清灌区>背景点,表明污水回灌对OCPs浓度分布具有一定的影响,同时通过比较各采样点中OCPs各异构体的组成发现,该区域HCHs、DDTs和硫丹农药主要来自于历史残留,部分区域曾使用林丹和三氯杀螨醇农药.对比各有机氯农药浓度地理分布特征,表明OCPs浓度分布与污水灌溉存在一定的联系.
In this article,thirty-one topsoil samples were collected to investigate the distribution of organochlorine pesticides（OCPs） in Xiaodian sewage irrigation area,Taiyuan City.The OCP concentrations of topsoil samples were determined by gas chromatography with electron capture detector（GC-ECD）.The results showed that the pollution of OCPs was not serious in study area,which ranged over 2.01—47.20 ng · g-1,with mean value of 16.76 ng · g-1.The concentrations of total DDT and HCH ranged over 0.27—37.93 ng · g-1 and 0.18—11.89 ng · g-1,with mean value of 8.38 ng · g-1 and 3.37 ng · g-1 respectively.The highest concentrations were below the Grade Ⅱ standard of ＂Soil Environ-mental Quality Standards＂（GB15618—1995）.The order of mean concentration of OCPs in different irrigation areas is as follows： sewage irrigation area groundwater irrigation areabackground area,which indicated that the sewage recharge brought certain effects on the distribution of OCPs in the study area.Meanwhile,according to the analysis of the composition,the main residuals of HCHs,DDTs and endosulfans pesticides were from the early usage,while lindane and dicofol were ever used in the partial area.Through comparison of geographic distribution with each OCP composition,it was indicated that there was relationship between OCP content and sewage irrigation.
出处
《环境化学》
CAS
CSCD
北大核心
2012年第9期1321-1327,共7页
Environmental Chemistry
基金
国家自然基金面上项目(40972156)资助
关键词
污灌区
地表土
有机氯
分布特征
sewage irrigation area
topsoil
organochlorine pesticides（OCPs）
distribution
