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Organochlorine pesticides in the ambient air of Chiapas, Mexico

机译：墨西哥恰帕斯州环境空气中的有机氯农药

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摘要

Organochlorine (OC) pesticides were measured in the ambient air of Chiapas, Mexico during 2000-2001. Concentrations of some OC pesticides (DDTs, chlordanes, toxaphene) were elevated compared with levels in the Great Lakes region, while those of other pesticides were not (hexachlorocyclohexanes, dieldrin). While this suggests southern Mexico as a source region for the former group of chemicals, comparably high levels have also been reported in parts of the southern United States, where their suspected sources are soil emissions (DDTs, toxaphene) and termiticide usage (chlordane). Ratios of p,p′-DDT/p,p′-DDE and trans-chlordane/cis-chlordane/trans-nonachlor (TC/CC/TN) in Chiapas suggest a mixture of fresh and weathered sources, while congener profiles of toxaphene suggest emission of old residues from soils. This is supported by air parcel back trajectory analysis, which indicated that air masses over Chiapas at the time of sampling had previously passed over areas of continuing or recent use of some OC pesticides as well as areas of past use.
机译：在2000-2001年期间，在墨西哥恰帕斯州的环境空气中测量了有机氯（OC）农药。与大湖区相比，某些OC农药（滴滴涕，氯丹，毒杀芬）的浓度升高，而其他农药（六氯环己烷，狄氏剂）则没有升高。尽管这表明墨西哥南部是前一组化学品的来源地区，但在美国南部的部分地区也据报道有相当高的水平，那里的可疑来源是土壤排放物（滴滴涕，毒杀芬）和杀白蚁剂的使用（氯丹）。恰帕斯州的p，p'-DDT / p，p'-DDE与反式氯丹/顺式氯丹/反式六氯之比（TC / CC / TN）表明混合了新鲜和风化的来源，而毒杀芬的同类物质建议从土壤中排放旧残留物。航空包裹向后轨迹分析证明了这一点，该分析表明，采样时恰帕斯州上空的空气质量先前已经超过了某些OC农药的持续使用或近期使用区域以及过去使用的区域。

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