岩溶地下河流域表层土壤有机氯农药分布特征及来源分析

发布时间：2018-01-15 21:30

  本文关键词：岩溶地下河流域表层土壤有机氯农药分布特征及来源分析　出处：《环境科学》2016年03期 　论文类型：期刊论文

  更多相关文章： 有机氯农药 表层土壤 分布特征 来源 岩溶地下河

【摘要】：为研究有机氯农药(OCPs)在重庆南山老龙洞地下河流域表土中的分布趋势、组成特征、来源及污染水平,采用气相色谱-微池电子捕获检测器(GC-μECD)分析了6个代表性表层土样中20种OCPs.结果表明,研究区表层土壤中20种OCPs均有不同程度检出,其中(除DDE、顺式氯丹、反式氯丹、狄氏剂)16种检出率高达100%,氯丹类和DDTs是主要污染物,不同采样点有机氯农药含量差异较大.OCPs总量变化范围在5.57~2 618.57 ng·g~(-1)之间,平均值为467.28 ng·g~(-1),与国内外其它区域相比,研究区表层土壤中HCHs和DDTs含量处于中上水平.有机氯农药总量和HCHs、DDTs、氯丹类农药总量分布具有相似的空间变化趋势,均为:上游中游下游,并且上游与中、下游的差距尤为显著.来源分析表明,HCHs主要来源于林丹的使用,DDTs既来源于历史农药残留,也来源于近期工业DDT的非法使用和三氯杀螨醇的输入,氯丹主要来自历史残留和大气沉降.结合中外土壤质量标准,新力村土壤属于有机氯农药严重污染土壤,下龙井湾、夏家咀和赵家院子土壤受到有机氯农药轻度污染,龙井旁和高中寺土壤属于无污染土壤.
[Abstract]:In order to study the distribution trend, composition, source and pollution level of organochlorine pesticides (OCPs) in the surface soil of Laolongdong underground river basin in Nanshan, Chongqing. Gas chromatography-microcell electron capture detector (GC- 渭 ECD) was used to analyze 20 kinds of OCPs in 6 typical surface soil samples. There were 20 kinds of OCPs detected in the surface soil of the study area, and the detection rate was as high as 100% (except for DDE, cis-chlordane, trans-chlordane, dieldrin, and dieldrin). Chlordane and DDTs were the main pollutants. The content of organochlorine pesticides in different sampling sites varied greatly. The total content of OCPs varied from 5.57 ~ (2 618.57) ng 路g ~ (-1). The average value was 467.28 ng 路g ~ (-1) ~ (-1), compared with other regions at home and abroad. The contents of HCHs and DDTs in the surface soil of the study area were in the middle and upper level. The total amount of organochlorine pesticides and HCHsN DDTs and the total distribution of chlordane pesticides had a similar spatial variation trend. The source analysis showed that HCHs mainly originated from the use of lindane and DDTs from the history of pesticide residues. Also from the recent illegal use of industrial DDT and the import of dicofol, chlordane mainly from historical residues and atmospheric deposition, combined with Chinese and foreign soil quality standards. The soil of Xinli Village was seriously polluted by organochlorine pesticides. The soil of Xialong Bay, Xia Jia Tsui and Zhaojia yard was slightly polluted by organochlorine pesticides.
【作者单位】： 西南大学地理科学学院三峡库区生态环境教育部重点实验室;中国地质科学院岩溶地质研究所国土资源部/广西岩溶动力学重点实验室;
【基金】：中央高校基本科研业务费专项(XDJK2013B021) 西南大学博士基金项目(SWU110258) 应对全球气候变化地质调查综合研究项目(12120113006700) 重庆市科委院士专项(cstc2013jcyjys20001)
【分类号】：X53;X592
【正文快照】： 有机氯农药(OCPs)是一类对环境构成严重威胁的人工合成环境激素,主要包括六六六(HCH)、滴滴涕(DDT)、氯丹、狄氏剂、艾氏剂、六氯苯等.OCPs具有高效、低成本、广谱杀虫和使用方便等特点,在我国20世纪50~80年代曾大量使用,但由于其在环境中的长期残留性、生物蓄积性和高毒性等，

本文编号：1430139