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首页> 外文期刊>Environmental Science and Pollution Research >Persistent organochlorine pesticides and polychlorinated biphenyls in air of the North Sea region and air-sea exchange
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Persistent organochlorine pesticides and polychlorinated biphenyls in air of the North Sea region and air-sea exchange

机译：北海地区空气中持续有机氯杀虫剂和多氯联苯

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Organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were studied to determine occurrence, levels and spatial distribution in the marine atmosphere and surface seawater during cruises in the German Bight and the wider North Sea in spring and summer 2009-2010. In general, the concentrations found in air are similar to, or below, the levels at coastal or near-coastal sites in Europe. Hexachlorobenzene and alpha-hexachlorocyclohexane (alpha-HCH) were close to phase equilibrium, whereas net atmospheric deposition was observed for gamma-HCH. The results suggest that declining trends of HCH in seawater have been continuing for gamma-HCH but have somewhat levelled off for alpha-HCH. Dieldrin displayed a close to phase equilibrium in nearly all the sampling sites, except in the central southwestern part of the North Sea. Here atmospheric deposition dominates the air-sea exchange. This region, close to the English coast, showed remarkably increased surface seawater concentrations. This observation depended neither on riverine input nor on the elevated abundances of dieldrin in the air masses of central England. A net depositional flux of p,p'-DDE into the North Sea was indicated by both its abundance in the marine atmosphere and the changes in metabolite pattern observed in the surface water from the coast towards the open sea. The long-term trends show that the atmospheric concentrations of DDT and its metabolites are not declining. Riverine input is a major source of PCBs in the German Bight and the wider North Sea. Atmospheric deposition of the lower molecular weight PCBs (PCB28 and PCB52) was indicated as a major source for surface seawater pollution.
机译：研究了有机氯杀虫剂（OCP）和多氯联苯（PCB），以确定德国最喜欢和春夏邮轮和较宽的2009 - 2010年春夏巡航中海洋气氛和地面海水中的发生，水平和空间分布。通常，空气中发现的浓度与欧洲沿海或近沿海地区的水平相似。六氯苯和α-六氯环己烷（α-HCH）接近相平衡，而γ-HCH观察到净大气沉积。结果表明，海水中HCH的趋势已经持续到γ-HCH，但α-HCH有点升级。除了在北海中央西南部的中南部，几乎所有的抽样网站都恰好展示了接近相平衡的相位均衡。这里大气沉积主导海洋交易所。该地区靠近英国海岸，表现出显着增加的表面海水浓度。该观察既不依靠河流投入，也不依靠英格兰中部风采中的狄雷丁高升丰富。 P'-DDE进入北海的净沉积通量通过海洋气氛中的丰富，并在海岸朝向海边观察到地表水中代谢物模式的变化。长期趋势表明，大气浓度的DDT及其代谢物没有下降。河道投入是德国光纤和更广阔的北海的PCB的主要来源。较低分子量PCB（PCB28和PCB52）的大气沉积被称为表面海水污染的主要来源。

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