作业场所空气中锡的火焰原子吸收测定法的改进

Improvement on flame atomic absorption spectrometry for determining Tin concentration in air of workplaces

目的探讨火焰原子吸收分光光度法测定作业场所空气中锡的影响因素，建立一种准确、灵敏、高效的空气中锡的检测方法。方法用不同的消化试剂消化采样滤膜，调整火焰原子吸收法的测定条件，比较测定结果。结果采用3ml盐酸＋0．5ml硝酸做消化液，调整原子吸收仪测定条件到最佳状态，锡在相应的试验浓度范围内具有良好的线性关系，其相关系数大于0．9990，最低检出限为1．0μg／ml，平均回收率为99．6％～102．6％，相对标准偏差均小于5．0％。结论样品的前处理必须选择合适的消化试剂种类和用量，在保证消解充分的同时排除消解试剂等影响因素的干扰，才能确保测定结果有足够的准确度和精密度。

Objective To explore the influence factors on determining Tin concentration in air of workplaces with flame atomic absorption spectrometry and to establish an accurate, sensitive and high-efficient method. Methods The different reagents were used to digest the sampling filter membranes and the determining conditions of flame atomic absorption spectrometry were adjusted, then the determining results were compared. Results When 3 ml hydrochloric acid and 0.5 ml nitric acid served as the digesting reagents and the determining conditions of flame atomic absorption spectrometry were adjusted to the best conditions, there was the good linearity in the tested concentration range of Tin, the correlation coefficient was larger than 0.9990. The limit of quantification was 1.0 μg/ml. The extraction recovery was between 99.6%-102.6%, and the RSD were all less than 5.0%. Conclusion The proper kinds and quantity of digestive reagents in pretreatment of the samples should be chosen for the accuracy and precision of the determination according to the influence factors of determination.