CAJ | 학술논문

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 mL,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。
응용전감우합등리자체질보법( ICP-MS)측정지구화학양품중흔량은시,수도상대지구화학봉도고적Nb, Zr, Y등원소적리자화합물간우엄중,양품불경부집분리,은적측시결과편차비상대。본연구이부재이분류뇨포소선택성부집Au화Ag,실현료Au화Ag여기타간우원소적분리,건립료부재이분류뇨포소부집、류뇨해탈-ICP-MS동시측정흔량Au화Ag적신방법。방법채용왕수(1：1)봉폐소해광양,보가수량50 mL,진탕시간화흡부온도분별위25 min화20℃,Au화Ag적방법검출한분별위0.02화0.007μg/g。사용본방법대8개국가일급표준물질중Au화Ag적검측결과여표준치기본상부,학증료방법적가행성。
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 by 1:1 aqua regia. After addition of 50 mL of water, the samples were adsorbed under oscillation for 30 min at 20℃. The detection limits of the Au and Ag were 0. 02 ng/g and 0. 007μg/g, respectively. The proposed method was successfully applied to the determination of Au and Ag in eight national standard materials.