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首页> 外文期刊>Journal of environmental sciences >Pollution characteristics and health risk assessment of benzene homologues in ambient air in the northeastern urban area of Beijing, China
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Pollution characteristics and health risk assessment of benzene homologues in ambient air in the northeastern urban area of Beijing, China

机译：北京东北市区环境空气中苯同系物的污染特征及健康风险评估

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摘要

Ambient benzene homologues were measured at a site in the northeastern urban area of Beijing, China, from August 24 to September 4, 2012 by SUMMA canister sampling followed by laboratory determination using cryogenic cold trap pre-concentration-GC-MS/FID, and their health risks were also assessed. Daily total benzene homologues ranged from 0.99 to 49.71 μg/m~3 with an average of 11.98 μg/m~3. Benzene homologues showed higher concentrations in the morning and evening than that at noontime. Comparison with previous studies revealed a trend of decrease for ambient benzene homologues probably due to the effective emission control in Beijing in recent years. Vehicular exhaust was the main source while volatilization of paints and solvents also made substantial contributions. Health risk assessment showed that BTEX (benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene) and styrene had no appreciable adverse non-cancer health risks for the exposed population, while benzene has potential cancer risk of 1.34E-05. Available data from cities in China all implied that benzene imposes relatively higher cancer risk on the exposed populations and therefore strict control measures should be taken to further lower ambient benzene levels in China.
机译：于2012年8月24日至9月4日在中国北京东北市区的一个地点测量环境苯同系物，方法是使用SUMMA罐采样，然后使用低温冷阱预浓缩-GC-MS / FID和它们的实验室测定方法还评估了健康风险。每日总苯同系物的范围为0.99至49.71μg/ m〜3，平均为11.98μg/ m〜3。苯同系物在早上和晚上显示的浓度高于中午。与先前研究的比较表明，环境苯同系物含量有下降的趋势，这可能是由于近年来北京的有效排放控制所致。车辆排气是主要来源，而油漆和溶剂的挥发也做出了巨大贡献。健康风险评估表明，BTEX（苯，甲苯，乙苯，邻二甲苯，间二甲苯和对二甲苯）和苯乙烯对接触人群没有明显的不利非癌症健康风险，而苯的潜在癌症风险为1.34E -05。来自中国城市的现有数据均暗示苯对接触人群的癌症风险相对较高，因此应采取严格的控制措施以进一步降低中国的环境苯水平。

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