Atmospheric organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in the Antarctic marginal seas: Distribution, sources and transportation
Atmospheric organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in the Antarctic marginal seas: Distribution, sources and transportation
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南极边缘海大气中有机氯农药（OCP）和多氯联苯（PCB）：分布、来源和运输
DOI：
10.1016/j.chemosphere.2020.127359
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Xie Zhouqing
中科院分区：
文献类型：
--
作者：
Wu Xiaoguo;Chen Afeng;Yuan Zijiao;Kang Hui;Xie Zhouqing
2013年11月至2014年3月，在中国第30次南极考察期间，在南极边缘海采集了空气样品。有机氯农药（OCPs）和多氯联苯（PCBs）在这些样品进行了分析。观察到的平均浓度为六氯苯>氯代多氯联苯>氯代六氯环己烷>氯代二氯二苯基三氯乙烷>氯代氯丹。在南极洲东部附近和罗斯海发现了高浓度的六氯苯，这反映了这些区域环境储存库中六氯苯的再排放。母体DDT（p，p '-和o，p'-DDT）很少被检测到，这表明大气中DDT主要受来自某些次生降水的风化DDT的影响。但是，不能排除新输入的滴滴涕，因为仍有一些样本的滴滴涕母体比例很高。仅在南印度洋（靠近澳大利亚）检测到HCHs，这一结果可能与澳大利亚南部HCHs的强烈排放有关。大多数样品的反式氯代烷/顺式氯代烷比值低于工业氯代烷，反映了风化氯代烷的主要影响。在罗斯海发现了高浓度的多氯联苯，表明多氯联苯的强烈再排放。此外，南极半岛附近大气中PCBs含量也相对较高，这可能与附近南极考察站的PCBs排放有关。与北极相比，OCPs和PCBs向南极的运输更为困难。在运输过程中，南极边缘海将起到屏障和“缓冲区“的作用。
From November 2013 to March 2014, air samples were collected in the Antarctic marginal seas during the 30th Chinese Antarctic research expedition. Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were analyzed in these samples. The mean concentrations were observed for hexachlorobenzene (HCB) >ΣPCBs >Σhexachlorocyclohexanes(HCHs) >Σdichlorodiphenyltrichloroethane(DDTs)>Σchlordanes. High levels of HCB were found near east Antarctica and in the Ross Sea, reflecting the re-emission of HCB from environmental reservoirs of these regions. Parent DDTs (p,p’- and o,p’-DDT) were rarely detected, suggesting that atmospheric DDT was predominantly influencedby weathered DDT from some secondarysources. However, fresh inputs of DDTs could not be excluded because there were still some samples with high proportions of parent DDTs. HCHs only were detected in the South Indian Ocean (near Australia), andthis result might be related to the intense emissions of HCHs from southern Australia. Ratios of trans-chlordane/cis-chlordanein most samples were lower than that in technical chlordane, reflecting the main influence of weathered chlordane. High levels of ΣPCBs were found in the Ross Sea, suggesting an intense re-emission of PCBs. Furthermore, atmospheric PCBs near the Antarctic Peninsula were also relatively high, this finding might be attributed to the emissions of PCBs from nearby Antarctic research stations. Comparing with the Arctic, transport of OCPs and PCBs towards Antarctica is more difficult. The Antarctic marginal seas would act as both barriers and “buffer zones”during the transportation processes.