This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total...This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total 34 polar organic acids were identified and quantified, including 23 n-fatty acids and 6 dicarboxylic acids, 5 aromatic acids.The total concentration of n-fatty acids was 62-664 ng·m-3, and the C16 acid was the most abundant acid,followed by C18.展开更多
采用安德森撞击式分级采样器采集2008-06-01~2008-09-30不同粒径的大气颗粒物样品,并用美国沙漠所DRI(desert research institute)的Model 2001A热光碳分析仪对其中的元素碳和有机碳进行了分析.结果表明,平均有56%、55%和73%的PM、OC...采用安德森撞击式分级采样器采集2008-06-01~2008-09-30不同粒径的大气颗粒物样品,并用美国沙漠所DRI(desert research institute)的Model 2001A热光碳分析仪对其中的元素碳和有机碳进行了分析.结果表明,平均有56%、55%和73%的PM、OC和EC富集于粒径<2.1μm的细粒子中.OC在<2.1μm中占25%,EC占5%,表明碳气溶胶是北京大气细粒子中的重要组分.对比发现,限车措施能够有效控制北京大气中碳质气溶胶的浓度.由OC与EC的比值可知,细粒子中的碳质气溶胶主要来源于汽车尾气排放和燃煤排放,粗粒子中的含碳物质主要来源于生物质燃烧及烹调过程.TSP中二次有机碳占总有机碳比例的平均值为74%.在PM2.1中的OC与二次水溶性离子表现出较高的相关性(R2值为0.88),而在>2.1μm的粗粒子中二者的相关性较弱(R2值为0.21).展开更多
文摘This paper set up the identification method of BF3/ methanol derivatization,GC-MS for analyzing organic acid in PM2.5 aerosol. The result shows that this method is reliable for monitoring the polar organic acid. Total 34 polar organic acids were identified and quantified, including 23 n-fatty acids and 6 dicarboxylic acids, 5 aromatic acids.The total concentration of n-fatty acids was 62-664 ng·m-3, and the C16 acid was the most abundant acid,followed by C18.
文摘采用安德森撞击式分级采样器采集2008-06-01~2008-09-30不同粒径的大气颗粒物样品,并用美国沙漠所DRI(desert research institute)的Model 2001A热光碳分析仪对其中的元素碳和有机碳进行了分析.结果表明,平均有56%、55%和73%的PM、OC和EC富集于粒径<2.1μm的细粒子中.OC在<2.1μm中占25%,EC占5%,表明碳气溶胶是北京大气细粒子中的重要组分.对比发现,限车措施能够有效控制北京大气中碳质气溶胶的浓度.由OC与EC的比值可知,细粒子中的碳质气溶胶主要来源于汽车尾气排放和燃煤排放,粗粒子中的含碳物质主要来源于生物质燃烧及烹调过程.TSP中二次有机碳占总有机碳比例的平均值为74%.在PM2.1中的OC与二次水溶性离子表现出较高的相关性(R2值为0.88),而在>2.1μm的粗粒子中二者的相关性较弱(R2值为0.21).