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首页> 外文期刊>Environmental Science & Technology >Selected Organochlorine Pesticides and Polychlorinated Biphenyls in Urban Atmosphere of Pakistan: Concentration, Spatial Variation and Sources
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Selected Organochlorine Pesticides and Polychlorinated Biphenyls in Urban Atmosphere of Pakistan: Concentration, Spatial Variation and Sources

机译：巴基斯坦城市大气中的精选有机氯农药和多氯联苯：浓度，空间变异和来源

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摘要

Robust knowledge on the occurrence and distribution of persistent organic pollutants (POPs) in the atmosphere of low-latitude regions is inevitable to forecast their transportation to pristine ecosystem and assess toxicological impacts upon local biota. Despite the earlier revelation of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in soils/sediments and water bodies in Pakistan, knowledge about atmospheric levels and sources of these POPs remains limited. For the first time, a network of XAD resin-based passive air samplers (PAS) was established across megacities of Pakistan, i.e., Karachi, the coastal city, and Lahore, lying in an agricultural region. Typical geographical locations of the two cities allowed assessing the influence of source regions on the occurrence and distribution patterns of selected POPs. Average concentrations (ng/PAS) in both cities ranged as endosulfan 39-101, DDTs 63-92, HCHs 33-65, heptachlor 10-26, and PCBs 48-61. High concentrations of endosulfan and lindane as observed throughout Lahore were certainly due to their ongoing applications in surrounding agricultural fields. Lower proportions of parental DDTs as compared to their metabolites were observed in both cities, suggesting inputs of DDTs from older or secondary sources. Owing to ultimate discharge of country's agricultural/industrial waste through river streams in to Arabian Sea, the coastal region of Karachi was found potential source of weathered POPs that could be dissipated at regional/global scales by maritime advections. The study contributes to the pool of information on fate and geographical distribution of POPs in subtropical developing countries.
机译：对于低纬度地区大气中持久性有机污染物（POPs）的发生和分布，有扎实的知识是不可避免的，以预测其向原始生态系统的运输并评估对当地生物群的毒理学影响。尽管早在巴基斯坦的土壤/沉积物和水体中就发现了有机氯农药（OCP）和多氯联苯（PCB），但对这些持久性有机污染物的大气水平和来源的了解仍然有限。首次在巴基斯坦的特大城市，即位于农业地区的卡拉奇，沿海城市和拉合尔的大城市之间建立了基于XAD树脂的被动式空气采样器（PAS）网络。这两个城市的典型地理位置允许评估源区域对某些持久性有机污染物的发生和分布方式的影响。两个城市的平均浓度（ng / PAS）为硫丹39-101，滴滴涕63-92，六氯环己烷33-65，七氯10-26和多氯联苯48-61。整个拉合尔所观察到的高浓度硫丹和林丹肯定是由于它们在周围农业领域中的持续应用。在两个城市中，亲代滴滴涕与其代谢产物的比例均较低，这表明来自较老或次要来源的滴滴涕的输入。由于该国的农业/工业废物最终通过流向阿拉伯海的河流排放，卡拉奇沿海地区被发现是风化持久性有机污染物的潜在来源，可以通过海洋平流消散区域/全球规模的持久性有机污染物。该研究有助于收集有关亚热带发展中国家持久性有机污染物的命运和地理分布的信息。

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  • 来源
    《Environmental Science & Technology》 |2014年第5期|2610-2618|共9页
  • 作者

    Jawad Nasir; Xiaoping Wang; Baiqing Xu; Chuanfei Wang; Daniel R. Joswiak; Said Rehman; Arifa Lodhi; Shoaib Shafiq; Rehmatullah Jilani;

  • 作者单位

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China,University of Chinese Academy of Sciences, Beijing 100049, China,Earth Sciences Directorate, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;

    Earth Sciences Directorate, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;

    Earth Sciences Directorate, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;

    Earth Sciences Directorate, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;

    Earth Sciences Directorate, Pakistan Space and Upper Atmosphere Research Commission (SUPARCO), P.O. Box 8402, Karachi 75270, Pakistan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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