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目的:探索并建立同时检测工作场所空气中铅、镉、锰及其化合物的电感耦合等离子体质谱分析法。方法:工作场所空气用微孔滤膜采集后,以压力罐消解法进行消化预处理,以电感耦合等离子体质谱法进行检测。结果:铅、镉、锰浓度为0μg/ml～0.50μg/ml时线性关系良好,相关系数r>0.999。铅、镉、锰的最低检出限分别为0.000019μg/ml、0.000022μg/ml、0.000012μg/ml。样品加标回收率铅、镉、锰分别是103.2%～105.2%、92.0%～99.0%、94.6%～104.5%,铅、镉、锰的相对标准偏差均<3%。结论:运用本法同时检测工作场所空气中铅、镉、锰及其化合物,具有良好的准确度和精密度,灵敏度高,检出限低,线性范围宽,元素之间的干扰少,方法高效可行。
Objective: To explore and establish an inductively coupled plasma mass spectrometry method for simultaneous determination of lead, cadmium, manganese and their compounds in the air at the workplace. Methods: The air in the workplace was collected with a microporous membrane filter and digested with a pressure tank digestion method. The air was detected by inductively coupled plasma mass spectrometry. Results: The linearity was good when the concentration of lead, cadmium and manganese was 0μg / ml ~ 0.50μg / ml, the correlation coefficient r> 0.999. The detection limits of lead, cadmium and manganese were 0.000019μg / ml, 0.000022μg / ml and 0.000012μg / ml respectively. The recoveries of spiked samples ranged from 103.2% to 105.2%, from 92.0% to 99.0% and from 94.6% to 104.5%, respectively. The relative standard deviations of lead, cadmium and manganese were all less than 3%. Conclusion: The method of simultaneous detection of lead, cadmium, manganese and its compounds in the air of the workplace has good accuracy and precision, high sensitivity, low detection limit, wide linear range, less interference between elements and high efficiency feasible.