Passive Air Sampling of Polychlorinated Biphenyls, Organochlorine Compounds, and Polybrominated Diphenyl Ethers Across Asia

Asia is of global importance economically, yet data on
ambient persistent organic pollutant levels are still sparse
for the region, despite international efforts under the
Stockholm Convention to identify and reduce emissions. A
large-scale passive air sampling survey was therefore
conducted in Asia, specifically in China, Japan, South Korea,
and Singapore. Polyurethane foam disks were deployed
simultaneously at 77 sites, between Sept 21 and Nov 16, 2004,
and analyzed for polychlorinated biphenyls (PCBs),
organochlorine compounds (hexachlorobenzene (HCB),
dichlorodiphenyltrichloroethanes (DDTs), chlordane), and
polybrominated diphenyl ethers (PBDEs). The meteorological
conditions prevailing in the region at this time facilitated
the assessment of local/regional differences in atmospheric
emissions, because large-scale advection effects due to
monsoons or dust storms did not occur. Air concentrations
estimated assuming an average sampler uptake rate of
3.5 m3/day ranged as follows (pg m-3):  PCBs, 5−340; HCB,
10−460; DDTs, 0.4−1800; chlordanes, 1−660; PBDEs,

亚洲在经济领域具有全球性的重要性，然而，尽管在斯德哥尔摩公约框架下，国际社会致力于识别和减少排放，但关于该区域环境持久性有机污染物水平的资料仍然匮乏。因此，在亚洲（尤其是中国、日本、韩国和新加坡）开展了一次大规模的被动空气采样调查。于2004年9月21日至11月16日，在77个地点同时部署了聚氨酯泡沫盘，对这些地点进行了多氯联苯（PCBs）、有机氯化合物（六氯苯（HCB）、滴滴涕（DDTs）、氯丹）、和多溴联苯醚（PBDEs）的分析。当时该区域的气象条件有利于评估局部/区域大气排放差异，因为由于季风或沙尘暴引起的大规模平流效应并未发生。假设平均采样器摄取速率为3.5立方米/天，估计的空气浓度如下（pg m-3）：PCBs，5−340；HCB，10−460；DDTs，0.4−1800；氯丹，1−660；PBDEs，