摘要
为明确大气醛酮类挥发性有机物的污染现状,在乌鲁木齐市5个功能区布设15个点位开展醛酮化合物手工采样,并分析其浓度特征、臭氧生成潜势(OFP)及来源。结果表明:乌鲁木齐市大气中15种醛酮化合物浓度均有不同程度的检出,总浓度呈现夏季(29.9μg/m^(3))略高于冬季(20.3μg/m^(3))的季节特征,醛酮化合物处于国内较低水平。甲醛、乙醛、丙醛、丁烯醛为优势污染物,夏季占73.7%,冬季占75.3%;OFP核算表明甲醛和乙醛是臭氧生成的关键前体物,夏季贡献率为59.4%,冬季贡献率为71.5%。乌鲁木齐市大气醛酮类挥发性有机物主要来自机动车尾气排放的人为源。
To clarify the pollution status of aldehydes and ketones among volatile organic compounds(VOCs)in the atmosphere,manual sampling of aldehyde and ketone compounds was carried out at 15 sampling points across five functional zones in Urumqi city.The concentration characteristics,ozone formation potential(OFP),and sources were analyzed.The results showed that 15 aldehyde and ketone compounds were detected in varying degrees in the atmosphere of Urumqi City,with the total concentration exhibiting a seasonal pattern of 29.9μg/m^(3)in summer slightly higher than 20.3μg/m^(3) in winter.The levels of aldehyde and ketone compounds were relatively low compared to domestic standards.Formaldehyde,acetaldehyde,propionaldehyde,and butenal were the dominant pollutants,accounting for 73.7%in summer and 75.3%in winter.OFP calculations indicated that formaldehyde and acetaldehyde were key precursors for ozone formation,contributing 59.4%in summer and 71.4%in winter.The aldehyde and ketone VOCs in Urumqi City's atmosphere primarily originated from anthropogenic sources such as motor vehicle exhaust emissions.
作者
钱国义
冷冰冰
张建中
QIAN Guo-yi;LENG Bing-bing;ZHANG Jian-zhong(Urumqi Ecological Environment Monitoring Station,Urumqi Xinjiang 830000,China)
出处
《干旱环境监测》
2026年第1期12-19,共8页
Arid Environmental Monitoring
关键词
醛酮类化合物
污染现状
臭氧生成潜势
乌鲁木齐市
Aldehyde and ketone compounds
Pollution status
Ozone generation potential
Urumqi City
