杭州市主城区大气PM2.5中多环芳烃来源分析

Analysis of the source of polycyclic aromatic hydrocarbons in the atmospheric PM2.5 in main urban areas of Hangzhou City

目的监测主城区大气PM2.5中多环芳烃(PAHs)组分及含量,分析其来源。方法2014年9月—2022年6月每月定期连续采样7 d~8 d,每日23 h,检测16种PAHs含量。采用特征比值法和主成分分析法,分析大气PM2.5中多环芳烃来源。结果特征比值法分析表明,杭州主城区大气PM2.5中PAHs来源主要是汽油燃烧、燃煤。主成分分析显示,杭州主城区大气PM2.5中PAHs冬春季来源主要为机动车尾气、天然气燃烧,其次为燃煤和餐厨油烟;夏秋季来源主要为汽车尾气、餐厨油烟,其次为燃煤和天然气。总体上杭州主城区大气PM2.5中PAHs来源是机动车尾气排放、天然气燃烧,煤炭燃烧和餐厨油烟,扬尘、植物和木材燃烧,其他来源。结论杭州主城区大气PM2.5中PAHs来源具有明显的季节性,机动车尾气排放、天然气燃烧、煤炭燃烧及餐厨油烟为其主要来源。

Objective This paper aims to monitor the composition and contents of polycyclic aromatic hydrocarbons(PAHs)in PM2.5 and analyze their main sources.Methods From September 2014 to June 2022,samples were collected regularly and continuously for 7-8 days,23 hours per day,and 16 kinds of PAHs were detected.The sources of PAHs in atmospheric PM2.5 were analyzed by characteristic ratio method and principal component analysis.Results The analysis of the characteristic ratio method showed that the main sources of PAHs in the atmospheric PM2.5 in Hangzhou City were gasoline combustion and coal burning.Principal component analysis revealed that the main sources were vehicle exhaust,natural gas combustion,coal burning and kitchen fumes in winter and spring;the main sources are automobile exhaust,cooking fumes,coal and natural gas in summer and autumn.In general,the main sources of PAHs in the atmospheric PM2.5 in the main urban area of Hangzhou are motor vehicle exhaust and natural gas combustion,coal combustion and kitchen fumes,dust,plant and wood combustion,and other sources.Conclusion The sources of PAHs in PM2.5 in the main urban area of Hangzhou have obvious seasonality,and the main sources are vehicle exhaust emissions,natural gas combustion,coal combustion and kitchen oil fume.