雨季廣州大氣中的硝酸鹽粒子

摘要： 對雨季廣州大氣中的硝酸鹽粒子進行了兩年的觀察.粒子被分為兩部分:粗大粒子(r＞1.0 μm)和微小粒子 (r≤1.0 μm).用離子色譜對粒子總量進行了總體分析,用復合薄膜法和X-射線分析法對單個粒子進行了分析.總體分析結果表明,粗大粒子中的NO-3、Ca2+和Na+含量比微小粒子中的高.對單個粒子的分析發現,硝酸鹽粒子不僅存在于粗大粒子中,而且也存在于微小粒子中,證明硝酸能凝結在海鹽上形成粗大硝酸鹽粒子,粗大硝酸鹽粒子有可能起著最終消除廣州大氣中硝酸的作用. Abstract： 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＞1.0μm) 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 NO3-, Ca2+ 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 removel mechanism for nitric acid in the air of Guangzhou during rainy season. 作 者： 蘭善紅    錢公望   作者單位： 華南理工大學,制漿造紙工程國家重點實驗室,廣東,廣州,510640  期 刊： 華南理工大學學報(自然科學版)  ISTICEIPKU   Journal： JOURNAL OF SOUTH CHINA UNIVERSITY OF TECHNOLOGY  年，卷(期)： 2002, 30(1)  分類號： X502  關鍵詞： 硝酸鹽    單個粒子    復合薄膜法    廣州    雨季    Keywords： nitrate    individual particle    multiple thin film method    Guangzhou    rainy season   

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