【摘要】 于2014年7月8日至8月13日在成都市城区和工业区选取两个点位开展挥发性有机物(VOCs)样品采集工作,分析结果显示,成都市夏季城区大气中VOCs质量浓度在34.1~458.8μg/m3,平均值为(137.3±91.8)μg/m3;工业区大气中VOCs质量浓度在26.7~474.9μg/m3,平均值为(135.9±103.5)μg/m3。早高峰时段(7:00~10:00)两个点位VOCs的浓度水平均高于其他时段,说明VOCs浓度受机动车排放的影响较为明显。用·OH消耗速率和臭氧生成潜势评估VOCs大气化学反应活性,结果显示,芳香烃和烯烃是影响大气化学反应活性的关键组分。城区和工业区的二次有机气溶胶(SOA)的生成潜势分别为4.859、4.559μg/m3,芳香烃不仅是臭氧生成潜势的关键活性组分,同时也是SOA的重要前体物。更多还原

【Abstract】 Atmospheric volatile organic compound(VOCs)in urban and industrial areas of Chengdu were collected from 8th July to 13 th August in 2014.The range of VOCs mass concentration in urban area of Chengdu was34.1-458.8μg/m3,with the average mass concentration was(137.3±91.8)μg/m3.The range of VOCs mass concentration in industrial area of Chengdu was 26.7-474.9μg/m3,with the average mass concentration was(135.9±103.5)μg/m3.The highest mass concentration of VOCs in two areas was both found during morning rush hours(7:00-10:00),indicating that vehicle source made large contribution to VOCs.The·OH radical loss rate and the ozone formation potential were applied to assess the chemical reactivity of VOCs,the results showed that alkenes and aromatics were the most active component in the atmosphere.The potential formation of secondary organic aerosols(SOA)in urban and industrial areas of Chengdu was 4.859,4.559μg/m3.The aromatics were not only the most important contributor to atmosphere chemical reactivity,but also important SOA precursor.更多还原