摘要
二次有机气溶胶(secondary organic aerosol,SOA)对大气灰霾的贡献是当前大气化学研究的热点.二羰基化合物(乙二醛和甲基乙二醛)是大气光化学反应的中间产物,可以通过多种途径形成SOA,对SOA的形成和总量增加有重要的贡献.大气中二羰基化合物主要来源于生物源(如异戊二烯)和人为源(如乙炔)等挥发性有机物的氧化.二羰基化合物可通过气粒分配(可逆过程)形成SOA,也可被云、雾或水相气溶胶吸收,发生水合、聚合、氧化等反应,生成的低挥发性产物留在颗粒相中生成SOA(不可逆过程).目前常用的二羰基化合物检测方法是利用衍生化试剂与二羰基化合物反应生成衍生物,经溶剂洗脱后再用气相色谱-质谱(gas chromatography-mass spectrometry,GC/MS)仪进行分析.
Contribution of secondary organic aerosol （SOA） to atmospheric haze is a not topic in atmospheric chemistry. Dicaxbonyl compounds （glyoxal and methylglyoxal） axe intermediate products in atmospheric photochemical reactions, greatly contributing to the formation and growth of SOA. Dicaxbonyl compounds in the atmosphere mainly come from biogenic sources such as isoprene and anthropogenic source such as acetylene and other volatile organic compounds oxidation. Dicarbonyl compounds can form SOA by gas particle partitioning, which is a reversible process. Dicaxbonyl compounds can produce significant aerosol yields, attributed to hydration, polymerization and oxidation and other reactions to produce low volatile products, which is an irreversible process. A common de- tection method of dicaxbonyl compounds is to use gas chromatography-mass spectrometry （GC/MS） after derivatization.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第2期159-171,共13页
Journal of Shanghai University:Natural Science Edition
基金
国家自然科学基金资助项目(41173098)
关键词
二羰基化合物
气粒分配
可逆反应
不可逆反应
二次有机气溶胶
dicarbonyl compound
gas particle partitioning
reversible reaction
irre-versible reaction
secondary organic aerosol （SOA）
