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[目的]建立电感耦合等离子体质谱法(ICP-MS)同时测定大气PM2.5中22种元素的方法. [方法]利用TH-150C空气采样器采集贵阳市南明区及花溪区大气颗粒物,经过分割后的采样滤膜,经超声提取后为检测样本,采用ICP-MS测定PM2.5中22种元素. [结果]22种元素在不同浓度范围内线性方程的相关系数均＞0.998;以采样体积144m3计,测定元素锂、锑、砷、铍、镉、铬、镍、硒、铊、钒、钴、锶、钼、银、锡、钡、铀、铝、铁、铅、锰、汞的检出浓度分别为0.03,0.09,0.38,0.03,0.03,0.63,1.05,0.39,0.04,0.05,0.03,0.03,0.05,0.06,0.09,1.16,0.05,2.36,1.94,0.85,0.72,0.04ng/m3;对空白滤膜分低、中、高浓度加入铝、铁、钡混标25.0、50.0、75.0μg/L,汞0.5,2.0,8.0μg/L,其余测定元素5.0、20.0、40.0μg/L,测定回收率范围为74.3％～98.5％,两组标准物质的质控滤膜测定结果满足其不确定度要求;各种元素测定的相对标准偏差范围是2.3％～9.9％.[结论]该方法测定大气PM2.5中22种元素具有较高的灵敏度、准确度及精密度.“,”[Objective] To establish a method for determining 22 elements in atmospheric PM2.5 simultaneously by inductively coupled plasma mass spectrometry (ICP-MS).[Methods] Particulate matters in air were sampled with TH-150 air sampler in Nanming District and Huaxi District of Guiyang.Samples were extracted using ultrasound from divided sample filters and measured by ICP-MS.[Results] The correlation coefficients for the 22 elements measured with varied concentration ranges were all ＞ 0.998.Within a total sampling volume of 144 m3,the detection concentrations of elements including lithium,stibium,arsenic,beryllium,cadmium,chromium,nickel,selenium,thallium,vanadium,cobalt,strontium,molybdenum,silver,tin,barium,uranium,aluminum,iron,lead,manganese,and mercury were 0.03,0.09,0.38,0.03,0.03,0.63,1.05,0.39,0.04,0.05,0.03,0.03,0.05,0.06,0.09,1.16,0.05,2.36,1.94,0.85,0.72,and 0.04ng/m3,respectively.After the blank membranes were spiked with mixed standards of aluminum,iron,and barium at 25.0,50.0,and 75.0 μg/L,mercury at 0.5,2.0,and 8.0 μg/L,and the other elements at 5.0,20.0,and 40.0 μg/L,the recoveries were between 74.3％-98.5％.The determination results for the two groups of quality control membranes met the requirements on uncertainty.Moreover,the relative standard deviations ranged from 2.3％ to 9.9％.[Conclusion] The method is highly sensitive,precise,and accurate for determining the 22 elements in atmospheric PM2.5.