成都市冬季不同粒径大气颗粒物水溶性无机离子的变化特征  

Variation characteristics of water-soluble inorganic ions in size-segregated atmospheric particles in Chengdu in winter

作　　者：杨周[1,2] 李晓东[1] 于静[3] 石友香[3] 杜锋[3] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]中国科学院大学,北京100049 [3]成都理工大学环境与土木工程学院,成都610059

出　　处：《生态学杂志》2013年第3期682-688,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(41173022)资助

摘　　要：利用Anderson冲击式分级采样器,在2010年冬季采集了成都市城东区不同粒径的大气颗粒物样品,分析了9种水溶性离子(SO42-、NO3-、Cl-、F-、NH4+、Ca2+、Mg2+、K+、Na+)的含量,并探讨其分布变化特征。SO42-、NO3-、NH4+、Cl-、K+、Na+等离子主要集中在粒径为3.3～0.65μm的细颗粒物中,而Ca2+、Mg2+则集中在粒径为11～4.7μm的粗颗粒物中。SO42-、NO3-、NH4+、Ca2+是主要的无机离子;在不同天气条件下,SO42-、NO3-的质量浓度按雾天、阴天、雨天递减,且雾天较阴天高2.5倍左右,较雨天高5倍左右,而其他离子也高出2倍左右;在不同粒径颗粒物中[NO3-]/[SO42-]比值均较小(<1),说明成都市目前仍然以固定(燃煤)污染源为主,移动污染源(汽车尾气)的影响正逐步增强。By means of the Andersen stage sampler, size-segregated atmospheric particles were collected in Chengdu City in winter, 2010. The size distribution spectra of majpr water-soluble inorganic ions （S042-, NO3-, CI-, F-, NH4＋, Ca2＋, Mg2＋, K＋, and Na＋） were determined. Mass contents of SO42- , NO3- , NH4＋ , Ci-, K＋ and Na＋mainiy concentrated in the fine particles within the size range of 3.3-0.65 μm, and those of Ca2＋ and Mg2＋ concentrated in the coarse particles （11.0-4.7 μm）. SO42-, NO3-, NH4＋ and Ca2＋ were the major inorganic ions in the collected atmospheric particles. Under different weather conditions, mass concentrations of SO42- and NO3- decreased in sequence of foggy day, cloudy day and rainy day, and their contents in the foggy day were about 2.5 and 5 times higher than that in cloudy day and rainy day, respec- tively. Accordingly, the other ions were also about 2 times higher. In the all size-segregated par- ticles, the ratios of [ NO3- ]/[ SO42- ] were less than 1.0, indicating that the air pollution in Chengdu City are still dominated by stationary source （coal combustion） while the mobile pollu- tion source （main as vehicle exhaust） is becoming increasingly important.

关 键 词：Anderson分级采样器 大气颗粒物 天气条件 水溶性无机离子 

分 类 号：X831[环境科学与工程—环境工程]