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黄金科学技术 ›› 2017, Vol. 25 ›› Issue (2): 110-115.doi: 10.11872/j.issn.1005-2518.2017.02.110

• 采选技术与矿山管理 • 上一篇    

高海拔地区原子吸收法测定地质样品中金的最佳条件探讨

牟长贤1,杨明荣,石爱萍1   

  1. 1.武警黄金第六支队,青海  西宁   810021;
    2.武警黄金第五支队,陕西  西安   710100
  • 收稿日期:2016-04-04 修回日期:2016-12-27 出版日期:2017-04-28 发布日期:2017-05-12
  • 作者简介:牟长贤(1971-),男,贵州德江人,高级工程师,从事实验室质量管理及分析测试工作。muchangxian@163.com

Discussion on the Optimum Conditions for Determination of Gold in Geological Samples by Atomic Absorption Spectrometry at High Altitude Area

MU Changxian1,YANG Mingrong2,SHI Aiping1   

  1. 1.No.6 Gold Geological Party of CAPF,Xining    810021,Qinghai,China;
    2.No.5 Gold Geological Party of CAPF,Xi’an    710100,Shaanxi,China
  • Received:2016-04-04 Revised:2016-12-27 Online:2017-04-28 Published:2017-05-12

摘要:

 针对高海拔地区大气压低,水沸点低,金的溶出率低,富集金的泡沫塑料在硫脲溶液中的解脱率低等问题,比较了高原地区与平原地区在相同条件下的测定结果,探讨了溶矿时王水浓度对金溶出率的影响;比较了2种溶矿方法、泡沫塑料吸附的温度和泡沫塑料的解脱方法等对测定结果的影响。通过多次试验,确定了高海拔地区测定金的最佳条件。该方法经国家一级标准物质分析验证,结果与标准值相符。方法的精密度(RSD,n=6)为2.85%~4.37%,检出限为0.03 μg/mL,适用于高海拔地区地质样品中金的分析,较好地解决了高原地区低压环境下样品中金测定的技术难题。

关键词: 高海拔地区, 泡沫吸附, 硫脲解脱, 火焰原子吸收法,

Abstract:

Aiming at the problems of low atmospheric pressure,low boiling point,low dissolution rate of gold,low release rate of the plastic foam containing gold in thiourea solution at high altitude area,the determination results of plateau and plain areas were compared under the same conditions,and the effect of aqua regia concentration on the dissolution rate of gold was discussed.At the same time,the main influence factors of the determination results were compared,such as two ore dissolving methods,foam adsorption temperature,release method of foam plastics.The optimum conditions for determining gold at high altitude area were obtained through many experiments.The method has been varified by determination of national standard reference material,and the results are consistent with the standard values.The precision of the method is 2.85% to 4.37% with RSD(n=6),and the detection limit is 0.03 μg/mL.The method is suitable for gold analysis in geological samples at high altitude,it solves the technical problem of the determination of gold under low pressure environment in plateau area.

Key words: high altitude area, foam adsorption, thiourea elution, flame atomic absorption spectrometry (FAAS), gold

中图分类号: 

  • O655
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