兰州市大气飘尘中正构烷烃分布特征

Characteristics of n-Alkanes in Airborne Particulates in Lanzhou

本文用ＧＣ—ＭＳ测定了兰州市大气飘尘、汽车尾气和烟尘等样品中可溶有机质的正构烷烃。研究表明，大气飘尘样品中正构烷烃含量较高，但不同时期尚存在一定差异；经与尾气、烟尘的正构烷烃对比认为，兰州市大气有机污染源主要来自于人为因素即化石燃料燃烧的排放物和少部分的自然因素。

In this paper, n-alkanes of extracitable organic matter of airborne particulate samples, exhausted gas and smog dust were examined by GC-MS. The results were shown as follows:The concentration of n-alkanes is relative high but its variance depends on different seasons or areas; the comparison among n-alkanes from airborne particulates, exhausted gas and smog dust shows that the atomospheric pollution in Lanzhou results mainly from artificial factors and partly from natural factors with the former being heavier in winter than in summer.