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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 1 2种无机离子 (F- ,Cl- ,NO-2 ,NO-3 ,SO2 -3 ,SO2 -4 ,PO3-4 ,Na+,NH+4,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 0 1— 1 0 0 0 μg·m- 3,有机物的线性范围为 0 0 0 5—1 0 μg·m- 3,相关系数除NH+4以外均高于 99 9% ,最低检测限为 0 0 0 0 1— 0 0 0 0 5 μg·m- 3,相对标准偏差为 0 43— 1 32 % .利用该技术 ,对北京市 2 0 0 1— 2 0 0 2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 ,NO-3 和NH+4,其浓度水平分别为 1 1 1 ,7 8和 6 2 μg·m- 3,各占PM2 5 质量的 1 0 6% ,7 4%及5 7% ,而WSOC的浓度水平为 0 0 1 1— 0 1 1 8μg·m- 3,占PM2 5质量浓度的 0 0 1— 0 1 % ,其中 ,乙二酸的浓度最高 ,其次为乙酸、丁二酸 ,丙二酸等 .
Simultaneous determination of water-soluble organic compounds (WSOCs) and various inorganic components in atmospheric aerosols by ion chromatography, twelve inorganic ions (F-, Cl-, NO-2, NO-3, SO2-3, SO2 -4, PO3-4, Na +, NH + 4, K +, Mg2 +, Ca2 +) and seven kinds of WSOC (formic acid, acetic acid, methanesulfonic acid, oxalic acid, malonic acid, succinic acid and glutaric acid) The linear range of this method for inorganic ions is 0 0 1 -1 0 0 0 0 μg · m-3, and the linear range of organic compounds is 0 0 0 5 -1 0 μg · m-3. Higher than 99 9%, and the lowest detection limit was 0 0 0 0 1 0 0 0 0 0 5 μg · m-3 with a relative standard deviation of 0 43- 1 32% .Based on this technique, The concentration of water-soluble species in atmospheric PM2 5 was determined in 2002. The results showed that the main water-soluble components of PM2 5 in Beijing were SO2 -4, NO 3 and NH 4, 1 1 1, 7 8 and 6 2 μg · m-3, accounting for 106%, 74% and 57% of the PM2 5 mass respectively, while the concentration of WSOC was 0 0 1 1- 0 1 1 8μg · M- 3, accounting for 0 0 1- 0 1% of the mass concentration of PM2 5, of which the concentration of oxalic acid is the highest, followed by acetic acid , Succinic acid, malonic acid and the like.