上海市大气细颗粒物的酸度及其与组成的关系

上海大学学报(自然科学版) ›› 2010, Vol. 16 ›› Issue (5): 541-546.

上海市大气细颗粒物的酸度及其与组成的关系

上海大学环境与化学工程学院环境污染与健康研究所，上海 200444

收稿日期:2010-07-05 出版日期:2010-10-30 发布日期:2010-10-30
通讯作者: 冯加良(1966～)，男，副研究员，博士,研究方向为大气环境. E-mail:fengjialiang@shu.edu.cn
基金资助:
国家自然科学基金资助项目（20877052）；上海市重点学科建设资助项目（S30109）

Acidity of PM_2.5 in Shanghai and Its Correlation with Chemical Composition of the Particles

Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

Received:2010-07-05 Online:2010-10-30 Published:2010-10-30

摘要/Abstract

摘要：

在上海宝山区和徐汇区内两个采样点采集不同季节的大气细颗粒物样品, 用酸性提取液测定其强酸度, 采用离子色谱法测定主要水溶性离子的浓度, 并用气溶胶无机离子模型计算细颗粒物在大气中的真实酸度. 结果表明，市区大气细颗粒物存在明显的酸性, 且酸性与颗粒物中矿物质的含量呈明显的负相关性. 细颗粒物在大气颗粒物总量中比例的增加可能是近年来上海酸雨频率不断增加的重要原因.

关键词: 大气细颗粒物；酸度；水溶性离子；酸雨

Abstract:

Seasonal samples were collected in Baoshan and Xuhui areas. Fine particles were extracted with acidic extraction solution and strong acidity measured. Composition of water soluble ions was measured with ion chromatography. In situ acidity of fine particles was estimated with the thermodynamic aerosol inorganic model. The results show that fine particles were acidic in the urban area while sometimes alkaline in the suburb industrial area. Acidity of fine particles was significantly correlated with concentrations of mineral components such as calcium and magnesium. Anthropogenic fine particles would promote the formation of acid rain, increase of the relative concentration of fine particles in the total airborne particles could be an important reason for the increase of acid rain frequency in recent years.

Key words: fine particles; acidity; water soluble ions; acid rain

中图分类号:

R 994

冯加良胡小玲管晶晶赵伟. 上海市大气细颗粒物的酸度及其与组成的关系[J]. 上海大学学报(自然科学版), 2010, 16(5): 541-546.

FENG Jia-Liang, HU Xiao-Ling, GUAN Jing-Jing, ZHAO Wei. Acidity of PM_2.5 in Shanghai and Its Correlation with Chemical Composition of the Particles[J]. Journal of Shanghai University（Natural Science Edition）, 2010, 16(5): 541-546.