氢化物—原子吸收光谱法测定地球化学样品中的微量锡

Determination of Trace Tin in Geochemical Samples by Hydride Generation-AAS

常规的空气—乙炔火焰原子吸收法测定锡灵敏度很低,不能满足化探找矿对锡灵敏度的要求。氢化物—原子吸收法测定锡具有灵敏度高,干扰少的特点,并已有文献报导。但是对共存元素的干扰及干扰的消除问题报导较少,难于直接用于复杂的地质样品分析。 本文采用电加热石英管原子化器、氢化物—原子吸收光谱法对测定地球化学样品中微量锡的最佳条件进行了试验。

A rapid and sensitive method for the determination of tin in geochemical sample by hydride generation-AAS with an electrically heated quartz tube has been investigated. Experimental conditions, such as acidity, atomization temperature, solution volume, and amount of reducing agent have been chosen. Interferences from 44 elements were discussed. 1% tartaric acid was suggested as the interference suppressing agent. The characteristic concentration and the relative standard deviation for the determination of tin at 224.6 nm are 0.23 ng/ml and 2.8% (for Sn 10 ng/ml), respectively. This method is applicable to the determination of down to 0.0001% tin in geochemical samples.