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珠三角地区冬季大气中PCBs的空间分布
引用本文:李春雷,郝永梅,麦碧娴,盛国英,傅家谟.珠三角地区冬季大气中PCBs的空间分布[J].环境科学学报,2007,27(4):655-659.
作者姓名:李春雷  郝永梅  麦碧娴  盛国英  傅家谟
作者单位:1. 复旦大学环境科学与工程系,上海,200433
2. 上海市水产研究所,上海,200433
3. 中国科学院广州地球化学研究所,有机地球化学国家重点实验室,广州,510640
基金项目:国家自然科学基金 , 中国科学院知识创新工程项目
摘    要:为了考察珠三角地区冬季大气中PCBs的空间分布,于2001年12月24日至2002年1月16日在广州的市区、郊区和背景区进行连续的空气样品采样.采用GC-MS-SIM模式进行PCBs分析.结果表明,空气中PCBs的总浓度按照距离市区从近到远的次序依次降低.市区PCBs平均浓度是郊区的1.61倍,是背景区的2.54倍.PCBs各单体化合物的浓度分布表现出明显的地区差异.低氯取代PCBs的市区浓度比郊区和背景区的浓度高出很多,而高氯取代PCBs的空间差异不明显.在不同氯数PCB浓度之和对PCBs总浓度的百分贡献率分布中,市区、郊区和背景区都表现为三氯和四氯取代PCBs的贡献最大,而且不同地区两者的贡献率之和非常接近.市区和郊区空气中三氯和四氯取代PCBs的贡献比较接近;而背景区空气中四氯取代PCBs的贡献高达52.79%,是三氯贡献的近2倍.郊区和背景区空气中五氯取代PCBs的平均贡献率分别是9.65%和10.87%.仅就颗粒相而言,其PCBs平均贡献率在市区、郊区和背景区表现出非常好的一致性.对市区、郊区和背景区空气中log Kp与log PLo进行回归分析,其斜率mr分别是-0.60、-0.42和-0.45,都明显地偏离空气中气/固分配的理想平衡状态.

关 键 词:珠三角  PCBs  空间分布  氯数分布  log  Kp  vs  log  PLo  珠三角地区  冬季  大气  PCBs  空间分布  Pearl  River  Delta  winter  atmospheric  distribution  平衡状态  分配  回归分析  一致性  颗粒相  比较  贡献率  空间差异  浓度比  氯取代  地区差异
文章编号:0253-2468(2007)04-0655-05
收稿时间:2006/5/10 0:00:00
修稿时间:05 10 2006 12:00AM

Spatial distribution of atmospheric PCBs in winter Pearl River Delta
LI Chunlei,HAO Yongmei,MAI Bixian,SHENG Guoying and FU Jiamo.Spatial distribution of atmospheric PCBs in winter Pearl River Delta[J].Acta Scientiae Circumstantiae,2007,27(4):655-659.
Authors:LI Chunlei  HAO Yongmei  MAI Bixian  SHENG Guoying and FU Jiamo
Affiliation:1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433 ;2. Shanghai Fisheries Research Institute, Shanghai 200433; 3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640
Abstract:To study the spatial distribution of atmospheric PCBs in winter Pearl River Delta, air samples were collected from 24/12/2001 to 16/1/2002 in urban, suburban and background of Guangzhou city. Atmospheric PCBs were analysed by GC-MS-SIM mode. The result indicated that the winter concentrations of atmospheric PCBs decreased in the order of urban, suburban and background. The average PCBs concentration in urban area was 1.61 times as that in suburban and 2.54 times as that in background. The homologue patterns of PCB concentrations were geographically different among urban, suburban and background. The concentrations of lower chlorinated congeners in urban atmosphere were much higher than those in suburban and background atmosphere, while for the higher chlorinated congeners, the spatial difference was not significant. With respect to the spatial distribution of PCB homologues, tri- and tetra-CBs were identified as the main components. The summed contributions of these two components were similar among the three areas, with values of 77.21%, 77.19%, and 81.10%. The percentages of tri- and tetra-CBs were similar in the urban and suburban atmosphere, while in the background atmosphere, the percentage of tetra-CBs was nearly two times as that of tri-CBs, with value of 52.79%. The average contributions of penta-CBs to the total atmospheric PCBs were similar between suburban and background area, with values of 9.65% and 10.87%. Taking only particulate PCBs into account, the percentages of penta-CBs were well consistent among urban, suburban and background area, with values of 15.20%, 16.23%, and 15.87%. The slopes of log Kp versus log PL were -0.60, 0.42 and -0.45 for urban, suburban and background, respectively, which were larger (shallower) than the expected theoretical value of -1.
Keywords:Pearl River Delta  polychlorinated biphenels (PCBs)  spatial distribution  homologue pattern  log Kp vs log PoL
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