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首页> 外文期刊>Environmental Science & Technology >Diastereoisomer- and Enantiomer-specific Profiles of Hexabromocyclododecane in the Atmosphere of an Urban City in South China
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Diastereoisomer- and Enantiomer-specific Profiles of Hexabromocyclododecane in the Atmosphere of an Urban City in South China

机译：六溴环十二烷在中国南方城市大气中的非对映异构体和对映体特异性分布

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摘要

Hexabromocyclododecanes (HBCDs) are ubiquitous contaminants in the environment, but little is known on the occurrence and distribution of HBCDs in the background atmosphere of urban environments. In this study, air samples were collected from four sites in the city of Guangzhou, a typical fast developing metropolitan of South China, for quantifying the concentration levels, diasteroisomer profiles, gas-particle distribution and enantiomeric fractions of HBCDs. The results showed that the measured mean atmospheric HBCD concentrations ranged from 0.69 to 3.09 pg/m~3, which were similar to those reported from remote or urban sites of the U.S., but were significantly lower than those of Europe. The analysis on diastereoisomer profiles indicated that α-HBCD (59-68%) was the dominant isomer and β-HBCD was a minor isomer in all air samples, which appeared to be different from commercial products. A large variable percentage of HBCDs (69.1-97.3%) are existed in the particle phase, suggesting that long-range tansport of HBCDs might be occur in some environmental conditions. The results of enantiomeric fractions indicated that β- and λ-HBCD were racemic mixtures in the tested air samples and that (-)-α-HBCD was slightly enriched in the typical urban site, implying that the HBCDs in these studied sites might be a mixture of emissions from both local sources and soil-air exchange.
机译：六溴环十二烷（HBCD）是环境中普遍存在的污染物，但是对于六溴环十二烷在城市环境的背景大气中的发生和分布知之甚少。在这项研究中，从广州市这四个快速发展的大都市广州市收集了空气样本，以量化六溴环十二烷的浓度水平，非对映异构体分布，气体颗粒分布和对映体分数。结果表明，测得的大气六溴环十二烷的平均浓度在0.69至3.09 pg / m〜3的范围内，与美国偏远或城市地区报告的浓度相似，但明显低于欧洲。非对映异构体谱分析表明，在所有空气样品中，α-六溴环十二烷（59-68％）是主要异构体，而β-六溴环十二烷是次要异构体，这似乎与商品不同。颗粒相中存在很大比例的六溴环十二烷（69.1-97.3％），这表明在某些环境条件下可能会发生六溴环十二烷的长期转移。对映体馏分的结果表明，在测试的空气样品中，β-和λ-六溴环十二烷是外消旋混合物，并且（-）-α-六溴环十二烷在典型的城市地区略有富集，这意味着这些研究地点的六溴环十二烷可能是本地排放和土壤空气交换的混合排放。

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