氢化物发生-原子荧光光谱法测定植物样品中汞硒砷

Determination of Hg,Se and As in Plant Samples by Hydride Generation-Atomic Fluorescence Spectrometry

植物样品经硝酸-高氯酸一次湿法消解后,用氢化物发生-原子荧光光谱法同时测定汞、硒、砷。测定时加入消泡剂磷酸三丁酯,可有效消除泡沫,降低记忆效应,提高精密度。方法精密度(RSD,n=12)为汞2.96%,硒0.96%,砷2.49%。经加标回收试验和国家一级标准物质验证,测定结果与标准值吻合。

A method for simultaneous determination of mercury,selenium and arsenic in plant samples by atomic fluorescence spectrometry was developed.The samples were digested with HNO3-HClO4 and tributyl phosphate（TBP） was added for effectively eliminating foam,reducing memory effect and improving the accuracy.The method has been applied to the determination of trace Hg,Se and As in National Standard Reference Materials and the results are in agreement with certified values.The recovery test was satisfactory with precision（RSD,n=12） of 2.96%,0.96% and 2.49% for Hg,Se and As,respectively.