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旱季廣州大氣中的硝酸鹽粒子
摘要: 利用復(fù)合薄膜法和總體分析,對旱季廣州大氣中的硝酸鹽粒子進行了4年的觀察.粒子通過一個二級粒子撞擊器分為二部分:粗大粒子(r>1.0μm)和微小粒子(r≤1.0tm).在電子顯微鏡下,一個粒子中所含的NO3-和S哦O42-可分別通過針狀結(jié)晶和同心圓環(huán)狀結(jié)構(gòu)的生成物而檢出.結(jié)果顯示:在廣州大氣粒子中,NO3-主要存在于粗大粒子中,而且和其他物質(zhì)結(jié)合在一起;在粗大粒子中,溶液呈堿性,而且鈣離子的含量最大.旱季廣州大氣中的硝酸鹽粒子可能是通過硝酸或二氧化氮氣體與大氣中既存粒子中的堿性物質(zhì)發(fā)生化學(xué)反應(yīng)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: 蘭善紅 錢公望 作者單位: 華南理工大學(xué) 期 刊: 華南理工大學(xué)學(xué)報(自然科學(xué)版) ISTICEIPKU Journal: JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE EDITION) 年,卷(期): 2001, 29(2) 分類號: X502 關(guān)鍵詞: 硝酸鹽 單個粒子 復(fù)合薄膜法 廣州 旱季【旱季廣州大氣中的硝酸鹽粒子】相關(guān)文章:
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