氢化物发生ICP-AES法测定药用植物中的痕量锗

Determination of Trace Germanium in Medicinal Plants by Hydride Generation ICP AES

本文应用氢化物发生ＩＣＰ－ＡＥＳ法研究了药用植物样品中痕量锗的测定方法，系统地研究了ＩＣＰ－ＡＥＳ仪器参数及氢化物发生条件对锗谱线信背比的影响，考察了１３种共存元素的干扰，并比较了植物样品的３种前处理方法。选定Ｈ３ＰＯ４－ＨＮＯ３－Ｈ２Ｏ２消化，在３ｍｏｌ／ＬＨ３ＰＯ４介质中，以１５ｇ／ＬＮａＢＨ４还原，测定药用植物样品中的锗，相对标准偏差≤２．９％，回收率为９４％～１０３％。方法检出限达０．１３μｇ／Ｌ。

A method for the determination of Ge inmedicinal plants was studied by hydride generation ICP AES in this paper. The influences of ICP AES operating parameters and hydride generation conditions on signal/background(S/B) ratio of Ge 209.426nm spectral line were investigated.The interferences of 13 co elements were studied.Three wet digestion procedures for plant samples were compared.When we digested medicinal plant samples using H 3PO 4 HNO 3 H 2O 2 procedure and determined Ge by the hydride generation ICP AES using 15g/L NaBH 4 as reducing agent in the medium of 3mol/L H 3PO 4,the RSD was less than 2.9% and the recovery of Ge was 94%￣103%.The detection limit of this method reached 0.13μg/L.