旱季广州大气中的硝酸盐粒子

时间:2023-04-25 23:10:02 环境保护论文 我要投稿
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旱季广州大气中的硝酸盐粒子

摘要: 利用复合薄膜法和总体分析,对旱季广州大气中的硝酸盐粒子进行了4年的观察.粒子通过一个二级粒子撞击器分为二部分:粗大粒子(r>1.0μm)和微小粒子(r≤1.0tm).在电子显微镜下,一个粒子中所含的NO3-和S哦O42-可分别通过针状结晶和同心圆环状结构的生成物而检出.结果显示:在广州大气粒子中,NO3-主要存在于粗大粒子中,而且和其他物质结合在一起;在粗大粒子中,溶液呈碱性,而且钙离子的含量最大.旱季广州大气中的硝酸盐粒子可能是通过硝酸或二氧化氮气体与大气中既存粒子中的碱性物质发生化学反应而生成的. Abstract: Aerosol samples were collected from the air of Guangzhou duringdry season for four years.Atmospheric particles were size-fractionated into two size ranges: coarse particles( r > 1.0 μm) and fine particles( r≤1. 0 μm). Presence of nitrate or/and sulfate in individual particles was determined with an electron microscope using multiple thin film method. It was found that nitrate particles existed mainly in the coarse size range and were not found in the fine size range. In the coarse size range, calcium ions were the largest, and the water extract of the coarse particles showed alkaline reaction. It suggests that nitrate particles in the air of Guangzhou are formed apparently through heterogeneous nucleation reaction of acidic gaseous, such as NOx, and HNO3, with alkaline particles. 作 者: 兰善红    钱公望   作者单位: 华南理工大学  期 刊: 华南理工大学学报(自然科学版)  ISTICEIPKU   Journal: JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE EDITION)  年,卷(期): 2001, 29(2)  分类号: X502  关键词: 硝酸盐    单个粒子    复合薄膜法    广州    旱季   

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