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首页> 外文期刊>Environmental Science & Technology >Chiral PCB Signatures in Air and Soil: Implications for Atmospheric Source Apportionment
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Chiral PCB Signatures in Air and Soil: Implications for Atmospheric Source Apportionment

机译：空气和土壤中的手性PCB签名：对大气源分配的影响

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摘要

Enantiomeric fractions (EFs) of chiral RGBs 95, 136, and 149 were measured in samples of topsoil and outdoor air at one urban and one rural location in the U.K. West Midlands between early 2001 and early 2002. While EFs in air were essentially racemic, those in topsoil indicated appreciable enantioenrichment of the second eluting enantiomer for PCB 95 and the (+) enantiomer for RGBs 136 and 149. This suggests (i) that essentially all atmospheric RGBs at both sites arise from racemic (i.e, primary) sources, rather than volatilization from soil and (ii) that appreciable enantioselective degradation of the monitored RGBs in topsoil occurs. This is one of only two reports of enantioselective degradation of RGBs in soil worldwide and is particularly noteworthy as it is occurring at PCB concentrations (e.g., 5.9 pg g{sup}(-1) for PCB 136) that are typical of the U.K. and other industrialized countries. The extent of enantioselective degradation in this study for RGBs 95 and 136 is consistent with those reported for soils in the Greater Toronto area (GTA). In contrast, enantioselective degradation of PCB 149 observed in this study is- while consistent with that reported for U.K. lacustrine sediments-in excess of that observed in either the GTA soil study or in U.S. lake sediments.
机译：在2001年初至2002年初之间，在英国西米德兰兹郡的一个城市和一个农村地区的表土和室外空气样品中测量了手性RGB 95、136和149的对映体分数（EFs）。尽管空气中的EFs本质上是外消旋的，表土中的那些表明，PCB 95的第二种洗脱对映体和RGB 136和149的（+）对映体都有明显的对映体富集。这表明（i）基本上，两个位置上的所有大气RGB都来自外消旋（即主要）来源，而不是（ii）表土中监测到的RGB发生明显的对映选择性降解。这是全世界土壤中RGBs对映选择性降解的仅有的两份报告之一，尤其值得注意，因为它是在英国和英国典型的PCB浓度（例如PCB 136的5.9 pg g {sup}（-1））下发生的。其他工业化国家。在这项研究中，对RGB 95和136的对映选择性降解程度与大多伦多地区（GTA）土壤的对映选择性降解程度一致。相反，在这项研究中观察到的PCB 149的对映选择性降解与英国湖相沉积物的报告相一致-超过了GTA土壤研究或美国湖泊沉积物中观察到的对映选择性。

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