负载泡塑富集-电感耦合等离子体质谱法测定地质样品中痕量金和银  

Determination of Au and Ag in Geological Samples by Loaded Polyurethane Foam-Inductively Coupled Plasma-Mass Spectrometry

作　　者：刘向磊[1,2] 孙文军[1,2] 文田耀[1,2] 王腾飞[1,2] 孙卫志[1] 李永新[1,2] 郭静[1] 

机构地区：[1]河南省地矿局第一地质矿产调查院,洛阳471023 [2]河南省金银多金属成矿系列与深部预测重点实验室,洛阳471023

出　　处：《分析化学》2015年第9期1371-1376,共6页Chinese Journal of Analytical Chemistry

基　　金：中国地质调查局项目(No.201403001024);国土资源部公益性行业科研专项(No.201211016-3)资助

摘　　要：应用电感耦合等离子体质谱法(ICP-MS)测定地球化学样品中痕量银时,受到相对地球化学丰度高的Nb,Zr,Y等元素的离子化合物干扰严重,样品不经富集分离,银的测试结果偏差非常大。本研究以负载二苯硫脲泡塑选择性富集Au和Ag,实现了Au和Ag与其它干扰元素的分离,建立了负载二苯硫脲泡塑富集、硫脲解脱-ICP-MS同时测定痕量Au和Ag的新方法。方法采用王水(1∶1)封闭消解矿样,补加水量50 m L,振荡时间和吸附温度分别为25 min和20℃,Au和Ag的方法检出限分别为0.02和0.007μg/g。使用本方法对8个国家一级标准物质中Au和Ag的检测结果与标准值基本相符,确证了方法的可行性。The relatively high abundance of geochemical elements such as Nb, Zr, Y and other elements shows serious interferences in the determination of trace silver in geochemical samples by inductively coupled plasma-mass spectrometry （ICP-MS）. Thus it will lead to large deviation in the determination of geochemical samples without separation and enrichment. The traditional emission spectrum or graphite furnace atomic absorption method is only single-element analysis to the silver and with bad sample representativeness. In this study, load diphenylthiourea （DPTU） foam selective enrichment was used for the separation of Au and Ag from other interfering elements in geological samples, and thiourea liberation-ICP-MS method was developed for the simultaneous determination of Au and Ag. The samples were first decomposed addition of 50 mL of water, the samples were adsorbed under oscillation for 30 min limits of the Au and Ag were 0.02 ng/g and 0. 007 μg/g, respectively. The proposed applied to the determination of Au and Ag in eight national standard materials. by 1：1 aqua regia. After at 20℃. The detection method was successfully

关 键 词：负载泡塑 化探样品 金 银 分离富集 电感耦合等离子体质谱法 

分 类 号：P632[天文地球—地质矿产勘探] O657.63[天文地球—地质学]