高分辨电感耦合等离子体质谱法测定地质样品中的微量锗

High Resolution ICP-MS Determination of Trace Amount of Germanium in Geological Samples

应用高分辨电感耦合等离子体质谱法测定地质样品中的微量锗。研究了地质样品中不同酸消解方法、提取方法对测定锗的影响,以及在高分辨电感耦合等离子体质谱仪高、中、低分辨率模式下测定地质样品中锗的质谱行为。用氢氟酸-硝酸体系分解样品,硝酸提取,在中分辨率模式下进行测定。方法的检出限(3s)为10ng·g-1。方法用于10个国家标准物质中锗含量的测定,测定值与认定值相符,测定值的相对标准偏差(n=10)小于4.5%。

High resolution ICP-MS was applied to the determination of trace amount of germanium in geological samples.Effect of different methods of acid digestion and extraction in geological samples on determination of germanium was discussed.Modes of LR,MR and HR in high resolution ICP-MS were also discussed for the determination of germanium.The sample was decomposed with HF-HNO3 and extracted with HNO3,then determined by MR mode.Detection limit(3s)of the method found was 10ng·g-1.In the analysis of10CRM′s by the proposed method,the results obtained were in consistency with the certified values,with RSD′s(n=10)less than 4.5%.