镇江大气挥发性有机物的臭氧生成潜势及来源研究

The Potential and Source of Producing Ozone from Volatile Organic Compounds in Zhenjiang

摘要: 通过《HJ 759-2015环境空气挥发性有机物的测定—罐采样/气相色谱质谱法》分析了2019年4—7月镇江市4个点位大气中的挥发性有机物,浓度水平在30μg/m³左右,各站点均以烷烃为主,其次为烯烃、芳香烃、炔烃。镇江大气中烯烃、烷烃、芳香烃和炔烃的臭氧生成贡献分别为43%、43%、13%和1%。各点位贡献依次为镇江市环境监测中心>新区办事处>丹徒区监测站>疾控中心。初步来源解析判断,芳香烃物种的主要来源是机动车尾气,其中丹徒区监测站还受到工业源的影响。

Abstract: According to the method of determination of VOCs in ambient air tank sampling/gas chromatography-mass spectrometry (HJ759-2015),the VOCs in the air of four sites in Zhenjiang City during April to July 2019 were analyzed. The concentration level was about 10 ppbv. Alkanes were the main matter,followed by alkenes,aromatic hydrocarbons and alkynes. The ozone contribution of alkenes,alkanes,aromatics and alkynes in the atmosphere of Zhenjiang is 43%,43%,13% and 1%,respectively. The contribution of each point was successively Zhenjiang environmental monitoring center,New Area Office,Dantu monitoring station and CDC. According to the preliminary source analysis,the main source of aromatic hydrocarbon species is vehicle exhaust,and the monitoring station of Dantu District was also affected by industrial sources.