【摘要】 2006年1月和4月在上海市区进行大气可吸入颗粒物PM10和PM2.5样品采集.采样时间分布为:06:30~10:00;10:30~14:00;14:30~18:00;18:30~06:00(次日).利用GC-MS对样品中PAHs进行定量分析,并对PAHs进行来源诊断.结果表明,PAHs主要来自机动车的尾气排放.PAHs的浓度呈现出明显的日变化特征:冬季PM10上PAHs的最高值出现在早上6:30~10:00,而PM2.5上PAHs的峰值则出现在中午10:30~14:00时段,春季PM10和PM2.5上PAHs的对应峰值则均出现在14:30~18:00.PAHs日变化特征的季节和粒径差异是受城市机动车尾气污染和大气光化学反应的综合影响.更多还原

【Abstract】 Airborne PM10 and PM2.5 samples were simultaneously collected in Yangpu district,Shanghai in Jan.and Apr.2006.The sampling time in one day was divided into four periods(06:30—10:00,10:30—14:00,14:30—18:00 and 18:30—06:00 next day).Identification and quantification of 13 PAHs compounds in PM10 and PM2.5 were carried out by GC-MS.The result shows that the vehicle exhausts were the main sources of PM-related PAHs.The clear diurnal variation of PAHs was showed in both seasons and both particle sizes.In winter,the highest concentration of PAHs in PM10 occurred in 06:30—10:00,while for PM2.5 it occurred in 10:30—14:00.In spring,the highest PAHs concentrations in PM10 and PM2.5 both occurred in 14:30—18:00.The diurnal variations of PAHs corresponded to both the vehicle exhausts and the atmospheric photo-chemical reactions.更多还原