锡试金-电感耦合等离子体质谱法测定铬铁矿石中铂族元素  

Determination of platinum group elements in chromite by inductively coupled plasma mass spectrometry with tin fire assay

作　　者：李志伟[1,2] 郝胜涛[1,2] 孙自军[1,2] 李杰[1,2] 孙慧莹[1,2] 

机构地区：[1]河南省岩石矿物测试中心,河南郑州450012 [2]国土资源部贵金属分析与勘查技术重点实验室,河南郑州450012

出　　处：《冶金分析》2014年第3期7-12,共6页Metallurgical Analysis

基　　金：2012年度国土资源部公益项目资助(编号201211081-03)

摘　　要：采用锡试金富集、盐酸溶解锡扣，建立了电感耦合等离子体质谱法（ICP—MS）测定铬铁矿石中铂族元素的方法。结果表明，选用15gsn粉，30gNa2CO3，20gK2CO3，20gSiO2，40g硼砂，10g面粉，5gCaO，2gCaF2，5gNaCl作为试金配料的组分，在1100℃进行熔矿，可以得到合格的锡扣；选择195Pt、105Pd．101Ru、103Rh、189Os和193Ir为待测元素同位素，以Lu（10ng／mL）校正了基体效应和信号漂移的影响。方法检出限（以下单位均为ng／g）分别为：0．18（铂）、0．21（钯）、0．15（钌）、0．15（铑）、0．12（锇）、0．15（铱）。采用方法对铬铁矿石成分分析标准物质GBW07201和GBW07202进行测定，结果与认定值一致，各元素的相对标准偏差（RSD，n=12）在1％～10％之间。After enrichment with tin assay and dissolution of tin buckle with hydrochloric acid, a meth- od for the determination of platinum group elements in chromite was established by inductively cou- pled plasma mass spectrometry（ICP-MS）. It was found that qualified tin buckle could be formed when 15 g of Sn powder, 30 g of Na2CO3, 20 g of K2CO3, 20 gof SiO2, 40 g of borax, 10 g of flour, 5 g of CaO, 2 g of CaF2 and 5 g of NaC1 were taken as the components of assaying ingredients and the ore was melted at 1100℃. 195Pt、105Pd.101Ru、103Rh、189Os and 193Ir were selected as the analyte iso- topes, and Lu （10 ng/mL） was employed to correct the influence of the matrix effect and signal drift. The detection limits of this method （the unit being ng/g） were 0.18 （Pt）, 0.21 （Pd）, 0.15 （Ru）, 0.15 （Rh）, 0.12 （Os） and 0.15 （Ir）, respectively. The method was applied to determination of chro-mite certified reference materials GBW07201 and GBW07202 for composition analysis. The results were consistent with the certified values , and relative standard deviation for each element （RSD, n= 12） was in the range of 1%-10%.

关 键 词：锡试金 铬铁矿石 电感耦合等离子体质谱法(ICP—MS) 铂族元素 

分 类 号：O657.63[理学—分析化学]