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目的建立工作场所空气中铬(Cr)、铁(Fe)、镍(Ni)、锡(Sn)和铅(Pb)的电感耦合等离子体–质谱(ICPMS)法。方法工作场所空气经微孔滤膜采集,并经湿式消解后,采用在线引入内标法,ICP-MS仪进样测定。结果本法线性范围:铁为0.00~1 000.00μg/L,其他4种元素为0.00~100.00μg/L,相关系数均大于0.999 5;方法检出限分别为:Cr 0.07μg/L、Fe 0.80μg/L、Ni 0.04μg/L、Sn 1.20μg/L、Pb 0.02μg/L;平均消解效率为99.42%~106.90%,相对标准偏差均小于5.00%;质量控制样品的元素测定值在真值范围之内。结论 ICP-MS法同时测定工作场所空气中Cr、Fe、Ni、Sn、Pb等重金属元素,检出限较低,灵敏度和精密度高,动态线性范围宽,基体干扰效应小,分析速度快。
Objective To establish an inductively coupled plasma mass spectrometry (ICPMS) method for the determination of chromium (Cr), iron (Fe), nickel (Ni), tin (Sn) and lead (Pb) in the workplace. Methods The air in the workplace was collected through a microporous membrane filter and subjected to wet digestion. The internal standard method was introduced online and the ICP-MS instrument was used for the injections. Results The linear range of this method was 0.00-1 000.00 μg / L for iron and 0.00-100.00 μg / L for the other four elements, with correlation coefficients greater than 0.999 5. The detection limits were 0.07 μg / L for Cr and 0.80 for Fe μg / L, Ni 0.04 μg / L, Sn 1.20 μg / L and Pb 0.02 μg / L respectively. The average digestion efficiency was 99.42% -106.90% with relative standard deviations less than 5.00% Within the scope. Conclusion ICP-MS method can simultaneously determine heavy metal elements such as Cr, Fe, Ni, Sn and Pb in workplace air with lower detection limit, higher sensitivity and precision, wide linear dynamic range, less matrix interference effect and faster analysis speed.