Determination of Arsenic，Antimony，Bismuth，Silver，Cadmium and Indium in Geological Samples by Inductively Coupled Plasma-Mass Spectrometry with Aqua Regia Sample Digestion

This paper presents the method for determination of As, Sb, Bi, Ag, Cd and In in geological samples by inductively coupled plasmamass spectrometry(ICP-MS) with aqua regia sample digestion. The elimination of the interference from coexistent elements on the determination of these elements was discussed. The detection limits (10SD, μg/g) are 0.2 for As, 0.01 for Sb, 0.005 for Bi, 0.01 for Ag, 0.01 for Cd and 0.005 for In. The recoveries are 96.8%～106% for As, 102%～108% for Sb, 102%～106% for Bi, 99.7%～104% for Ag, 103%～108% for Cd and 97.9%～100% for In， with the precision （RSD，n=12）of 1.3%～3.0%,0.65%～2.3%,1.2%～2.6%, 3.2%～6.6%,3.7%～8.0% and 1.1%～5.0%，respectively. The method has been applied to the determination of these elements in the National Standard Reference Materials and the results are in agreement with the certified values.