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环境化学  2015 

气溶胶水溶性无机物及有机物的离子色谱测定

Keywords: 气溶胶,离子色谱,水溶性无机物,水溶性有机物

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Abstract:

利用离子色谱技术同时测定大气气溶胶中的水溶性有机物(WSOC)与各种无机成分,检测出12种无机离子(F-,Cl-,NO2-,NO3-,SO32-,SO42-,PO43-,Na+,NH4+,K+,Mg2+,Ca2+)及7种WSOC(甲酸、乙酸、甲磺酸、乙二酸、丙二酸、丁二酸、戊二酸).该方法对无机离子的线性范围为0.01-1000μg·m-3,有机物的线性范围为0.005-10μg·m-3,相关系数除NH4+以外均高于99.9%,最低检测限为0.0001-0.0005μg·m-3,相对标准偏差为0.43-1.32%.利用该技术,对北京市2001-2002年度大气PM2.5中水溶性物种的浓度水平进行了测定.结果表明,北京市PM2.5中主要的水溶性组分为SO2-4,NO3-和NH4+,其浓度水平分别为11.1,7.8和6.2μg·m-3,各占PM2.5质量的10.6%,7.4%及5.7%,而WSOC的浓度水平为0.011-0.118μg·m-3,占PM2.5质量浓度的0.01-0.1%,其中,乙二酸的浓度最高,其次为乙酸、丁二酸,丙二酸等.

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