南宁市大气颗粒物中OCls的分布及源解析  

Distribution and Possible Sources of OCls in Airborne Particulate Matters in Nanning City

作　　者：梁柳玲 陈德翼 田艳 黄宁 蒋建宏 

机构地区：[1]广西壮族自治区环境监测中心站,广西南宁530028

出　　处：《环境科学与技术》2016年第12期128-133,共6页Environmental Science & Technology

基　　金：广西科技基础条件平台建设项目(10-108-27H);广西科学研究与技术开发计划项目(2014AA03048)

摘　　要：为了研究有机污染物的区域分布、来源与大气传输,利用主动式大气采样器对南宁市春季8个监测点位大气颗粒物样品采集,采用加速溶剂萃取和气相色谱-三重四级杆串联质谱对样品中17种有机氯农药(OCPs)和11种氯苯类化合物(CBs)的含量状况进行了分析测定。检测结果表明,大气颗粒物中OCPs和CBs浓度分别为nd^34.7 pg/m^3和518~1 315 pg/m^3,以滴滴涕类化合物(DDTs)、二氯苯和三氯苯污染为主。DDTs同分异构体分布表明南宁市北面大气颗粒物中DDTs可能来自同一个源,而东、南、西面的DDTs则来自不同的源。南宁市大气颗粒物中DDTs主要来自附近地表土壤历史残留,并非远距离传输,也没有新三氯杀螨醇输入环境或三氯杀螨醇输入不是主要来源。二氯苯、三氯苯、四氯苯不同物质之间呈现同步迁移的规律,五氯苯和六氯苯也呈现同步迁移的规律。Contents of 17 types of organochlorine pesticides（OCPs） and 11 types of chlorobenzenes（CBs） were determined to investigate the spatial distribution,sources and atmospheric transport of organic pollutants contained in air-borne particulate matters by using gas chromatography-triple quadrupole mass spectrometry（GC-MS/MS）. The samples were collected with active air sampler from the 8 sampling sites of Nanning City in spring and pretreated with accelerated solvent extraction（ASE）. The results indicated that the mass contents of OCPs and CBs in air-borne particulate matters ranged from nondetectable（ND） to 34.7 pg/m^3 and from 518 to 1 315 pg/m^3,respectively. The compositions of OCPs and CBs were mainly DDTs,dichlorobenzene and trichlorobenzen. Analysis of isomer ratio showed that the pollutants might be transported from the same source in the north area of the City,while in the east,south and west areas,pollutant sources were distinctly different. Instead of input of the long-range transported pollutants,the historical residue in the local soil probably was the main source of DDTs,meanwhile,there was no newly introduced dicofol in local environment or dicofol was not the major source of DDTs. Dichlorobenzene,trichlorobenzen and tetrachlorobenzene showed the same atmospheric transport mechanism,while the transport of pentachlorobenzene synchronizes the hexachlorobenzene＇s.

关 键 词：大气颗粒物 有机氯化合物 分布 源解析 加速溶剂萃取 气相色谱-三重四级杆串联质谱 

分 类 号：X513[环境科学与工程—环境工程]