石墨管涂钽-塞曼效应电热原子吸收测定工作场所空气中钡

Determination of barium in air of workplace by zeeman AAS with tantalum-coated graphite tube

目的：建立石墨炉原子吸收测定工作场所空气中钡的方法。方法：微孔滤膜采集工作场所空气中的钡,经超声洗脱后用涂钽石墨管电热原子吸收测定。结果：用涂钽石墨管可以有效地消除形成碳化物的影响和记忆效应。方法的测定范围为0～100μg/L,回归方程A=0.00235 c＋0.0327,r=0.9997;检出限2.5×10-11g,最低检出浓度0.003 mg/m3;平均洗脱效率〉94%;相对标准偏差（RSD）为2.6%～4.1%。结论：本方法适用于工作场所空气中钡的测定。

Objective：To establish a novel method for the determination of barium in workplace air by graphite furnace atomic absorption spectrometry.Methods：The sample was collected by microporous membrane and eluted by ultrasound.And the contents of barium was determined by Zeeman-GFAAS with tantalum-coated graphite tube.Results：The interference and memory effect of carbide-forming were eliminated dealing with the tantalum-coated graphite tube.The determination scope of the method was 0~100 μg/L.The regression equation was A=0.00235c＋0.0327,r=0.9997.The detection limit and minimum detectable concentration of this method were found to be 2.5×10-11 g and 0.003 mg/m3 respectively.The RSD of the results was in the range of 2.6% to 4.1% with an average elution efficiency more than 94%.Conclusion：This method is suitable for the determination of barium in workplace air.