【摘要】 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 .更多还原

【Abstract】 This paper conducted a study of determination of the water soluble inorganic and organic species of aerosols in simultaneity by use of ion chromatography technology.Based on this,twelve inorganic ions(F -,Cl -,NO - 2,NO - 3,SO 2- 3,SO 2- 4,PO 3- 4,Na +,NH + 4,K +,Mg 2+ ,Ca 2+ )and seven WSOC(formate,acetate,methylsulfonate,oxalate,malonate,succinate,glutarate)of aerosols in city were quantitatively determined.The linear concentrations ranged from 0 01μg·m -3 to 1000μg·m -3 for inorganic species and from 0 005μg·m -3 to 10μg·m -3 for organic species( r =0 999—0 9999);The RSD were 0 43—1 32% and the detection limits were from 0 0001μg·m -3 to 0 0005μg·m -3 .The results showed that SO 2- 4,NO - 3 and NH + 4 were the dominant ionic species of PM 2 5 in Beijing,which were 11 1μg·m -3 ,7 8μg·m -3 and 6 2μg·m -3 for the yearly averaged concentrations and accounted for 10 6%,7 4% and 5 7% of the total mass of PM 2 5 ,respectively.WSOC of PM 2 5 in Beijing exhibited an annual concentration range of 0 011—0 118μg·m -3 and possessed 0 01—0 1% of PM 2 5 mass,among which oxalate was the most abundant species,followed by acetate,succinate and malonate.更多还原