王水溶样-电感耦合等离子体质谱（ICP-MS）法测定地质样品中的金

称取10.00 g样品放于马弗炉中700℃条件下焙烧后,加入约60 mL王水,盖上表面皿于低温电热板(1000 W)溶解40 min,加入5 mL动物胶(20 g/L),搅拌均匀后加入等体积的水,抽滤,滤液定溶至500 mL,分液后以10 ng/mL的Rh为内标建立了王水溶样-电感耦合等离子体质谱(ICP-MS)法快速测定地质样品中金的分析方法。方法适用于检测0.1~10μg/g品位的矿石样品,对国家一级标准物质GBW07209、GBW07808、GBW07809、GBW07300进行12次测定,其相对标准偏差RSD均小于5%,相对误差RE均小于2%。方法具有简单快速等优势,在实际应用中得到满意的结果。

Direct Determination of Gold in Geological Samples byInductively Coupled Plasma Mass Spectrometry with Aqua Regia Sampling Preparation

Weighed 10.00 g samples and put in muffle furnace at 700℃for one hour,then added about 60 mL aqua regia,covered the surface dish and dissolved in the low temperature electric heating plate(1000 W)for 40 minutes,added 5 mL gelatin(20 g/L),after mixing,adding equal volume of water,draining and filtrating,the filtrate was dissolved to 500 mL.A rapid method for the determination of gold in geological samples by aqua regia-inductively coupled plasma mass spectrometry(ICP-MS)was developed using Rh of 10 ng/mL as internal standard.This method is suitable for the analysis of 0.1—10μg/g grade ore samples.The certified reference material of GBW07209,GBW07808,GBW07809,GBW07300 were repeatedly tested.The relative standard deviation(RSD,n=12)was less than 5%and relative error(RE)is less than 2%.This method has the advantages of simplicity and rapidity,and has obtained satisfactory results in practical application.