摘要
对雨季广州大气中的硝酸盐粒子进行了两年的观察 .粒子被分为两部分 :粗大粒子 (r >1.0 μm )和微小粒子 (r≤ 1.0 μm ) .用离子色谱对粒子总量进行了总体分析 ,用复合薄膜法和X_射线分析法对单个粒子进行了分析 .总体分析结果表明 ,粗大粒子中的NO- 3、Ca2 +和Na+含量比微小粒子中的高 .对单个粒子的分析发现 ,硝酸盐粒子不仅存在于粗大粒子中 ,而且也存在于微小粒子中 ,证明硝酸能凝结在海盐上形成粗大硝酸盐粒子 ,粗大硝酸盐粒子有可能起着最终消除广州大气中硝酸的作用 .
Aerosol samples were collected from the air of Guangzhou during rainy season for two years. Atmospheric particles were size_fractionated into two size ranges: coarse particles( r >1.0 μm) and fine particles ( r ≤1.0 μm). The aerosol particles were measured with bulk analyses by ion chromatography and analyses of individual particles by multiple thin film method and X_ray analysis technique. Chemical analysis of bulk samples showed that the content of NO - 3, Ca 2+ and Na + in the coarse size range was much higher than that in the fine size range. Analyses of individual particle showed that nitrate particles existed not only in the coarse size range but also in the fine size range. Evidence of nitric acid condensed on the sea salt particle to form a coarse nitrate particle was obtained. Coarse nitrate particles probably serve as a permanent removal mechanism for nitric acid in the air of Guangzhou during rainy season.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第1期84-88,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目 (2 0 0 770 0 9)
广东省环境保护局和高等教育厅科技研究开发项目 (B2 30 2 5 6 4 )
广州市环境保护局资助项目 (30 2_B2 6 980 )~~
