成都市夏季大气挥发性有机物污染及其对二次有机气溶胶生成的贡献  

Pollution of volatile organic compounds and their contribution to the secondary organic aerosol formation in summer of Chengdu

作　　者：王倩 王红丽[1,2] 周来东 李莉[1,2] 冯淼 宋丹林 景盛翱[1,2] 周子航 陈长虹 

机构地区：[1]国家环境保护城市大气复合污染成因与防治重点实验室,上海200233 [2]上海市环境科学研究院,上海200233 [3]成都市环境保护科学研究院,四川成都610072

出　　处：《环境污染与防治》2015年第7期6-12,共7页Environmental Pollution & Control

基　　金：国家科技支撑计划项目(No.2014BAC22B03);上海市环境保护局2014年重大课题研究项目(沪环科2014-01)

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／m2，平均值为（137．3±91．8）μg／m2；工业区大气中VOCs质量浓度在26．7～474．9μg／m2，平均值为（135．9±103．5）μg／m2。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／m2，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。Atmospheric volatile organic compound （VOCs） in urban and industrial areas of Chengdu were col- lected from 8th July to 13th August in 2014. The range of VOCs mass concentration in urban area of Chengdu was 34.1-458.8μg/m3 ,with the average mass concentration was （137.3±91.8）μg/m3. The range of VOCs mass concen- tration in industrial area of Chengdu was 26.7±74.9μg/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 aro- matics 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 im- portant contributor to atmosphere chemical reactivity, but also important SOA precursor.

关 键 词：挥发性有机物 化学活性 二次有机气溶胶 成都市 

分 类 号：X51[环境科学与工程—环境工程]