摘要
以五级撞击式大气颗粒物采样器采集贵阳城、郊大气颗粒物样品，分析了不同粒径大气颗粒物的全硫同位素组成，以此为基础，探讨了大气颗粒物中硫的来源，同时初步查明了贵阳城、郊大气颗粒物全硫同位素组成在时间和粒径上的变化趋势：（１）大气颗粒物的硫同位素组成变化范围随粒径变小而减小。说明伴随粒径变小，颗粒物中硫的来源趋向简单，硫越来越多地由气相硫转化而来。（２）春季样品各级颗粒物的δ３４Ｓ值有低于夏季的趋势。这反映出，燃煤排放的ＳＯ２通量与生物源硫化物通量在时间上的消长关系是控制颗粒物中硫的来源构成的一个重要因素。
Cascade impostor was used to collect different size fractions of urban and suburban atmospheric particulate matter in Guizhou Province.Approximate ranges of diameters of different size fractions are as follows:stage1>7 0μm,7 0μm>stage2>3 3μm,2 0μm<stage3<3 3μm,1 1μm<stage4<2 0μm and stage5<1 1μm.Total sulfur of atmospheric particulate matter of different size fractions have been extracted and analysized in terms of isotopic composition.This study shows:(1)the ranges of surfur isotopic composition of atmospheric particulate matter of different size fractions tend to narrow with decreasing of size fraction diametric range,and sulfur isotopic composition of the smaller size fraction particulates is more depleted in 34 S than that of larger ones.(2)surfur isotopic composition of atmospheric particulate matter collected in spring is more depleted in 34 S than that in summer.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1996年第6期426-429,共4页
China Environmental Science
关键词
大气
颗粒物
稳定同位素法
atmospheric particulate matter,sulfur, sulfur isotopic composition,size fraction.
