活性炭吸附ICP-MS同时测定地球化学样品中的金和银

Simultaneous Determination of Gold and Sliver in Geochemical Samples by ICP-MS with Adsorption of Activated Carbon

建立了用活性炭对地球化学样品中痕量金、银进行预富集的新方法。结果表明当消解液中硫脲浓度大于0.2%时,活性炭能对溶液中金和硫脲还原后的痕量银进行吸附富集。而Cu、Fe、Co、Ni、Pb、Zn、Bi和Sb等常见阳离子不被吸附,吸附完的活性炭经碳化、灰化、浸取后用ICP-MS同时测定,通过测定3个国家标准物质评价方法的准确度,结果与标准值吻合。该法准确度高、检出限低,且方便快速。

A novel method for the simultaneous determination of gold and sliver in geochemical samples by ICP-MS after preconcentration with activated carbon was proposed. When the concentration of thiourea was more than 0. 2%,silver and gold in solution could be simultaneously enriched by activated carbon, while Cu, Fe, Co, Ni, Pb, Zn, Bi and Sb could not be done. Then the activated carbon was carbonized, ashed and digested. Gold and sliver in the gotten solution was simultaneously determined by ICP-MS. By analyzing three Chinese certified reference materials to evaluating the accuracy of this method, the results are confident with the certified values. The proposed method has low detection limit,high accuracy and high efficency.