【摘要】 研究乌鲁木齐环境空气中VOCs的污染特征，对乌鲁木齐环境空气中的VOCs的组成、浓度状况、变化特征和对臭氧生成潜势的贡献和健康风险等进行探讨。结果表明：环境空气中定性检出挥发性有机物共114种，其中前十的有机物依次为乙炔、乙烷、丙烯、乙烯、1-丁烯、正丁烯、丙烯、异戊烯、丙酮、异丁烯。监测期间，环境空气中的VOCs浓度波动较大，日均值为75.64 ppb，浓度在17.63～279.54 ppb波动。乌鲁木齐冬季VOCs与空气中的O₃浓度呈现一定的相关性，VOCs的O₃生成潜势（OFPs）前12种物质浓度1.98～40.68 ppb，分别是乙烯>丙烯>乙炔>乙醛>间二甲苯>正丁烯>甲苯>邻二甲苯>对二甲苯>1-己烯>1,2,4三甲苯>丙酮。乌鲁木齐冬季VOCS浓度与全国多个城市相比，处于较高水平。VOCs中6种苯系物属于USEPA公布的有毒有害空气污染物，其HI远小于l，说明苯系物对研究区人群尚不存在非致癌风险；其中苯的致癌风险值较高，超过了US EPA建议值（1.0E-06）的8.15倍，说明苯对研究区居民身体健康存在潜在的致癌风险。更多还原

【Abstract】 To study the pollution characteristics of VOCs in the ambient air in Urumqi,the composition,concentration status,change characteristics,contribution and health risk of VOCs in Urumqi were discussed. The results showed that 114 volatile organic compounds were detected in the ambient air,among which the top ten organic compounds were acetylene,ethane,propylene,ethylene,1-butylene,n-butylene,propylene,isoprene,acetone and isobutylene. During the monitoring period,the VOCs concentration in the ambient air fluctuated greatly,with a daily mean of 75.64 ppb and a concentration fluctuating at 17.63～279.54 ppb. The correlation between VOCs and O₃ concentration in air in winter,with the top 12 potential（OFPs）,were 1.98～40.68 ppb,in turn ethylene& gt,propylene & gt,acetylene & gt,n-butene & gt,toluene & gt,catexene & gt,p-xene & gt,1-hexene & gt,1,2,4 toluene & gt,acetone. The winter VOCs concentration in Urumqi was at a high level compared with many cities in China. Six benzene strains in VOCs were toxic and harmful air pollutants published by USEPA,and their HI was far less than l,indicating that benzene strains did not have non-carcinogenic risk in the study area; benzene was high,exceeding 8.15 times of the US EPA recommended value（1.0E-06）,indicating a potential carcinogenic risk for the health of residents in the study area.更多还原