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中国无机分析化学:2021,11(2):45-50
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聚氨酯泡沫塑料吸附ICP-MS测定地球化学样品中的痕量金
刘彤彤, 黄登丽
(甘肃有色金属地质勘查局张掖矿产勘查院)
Adsorption and Thiourea desorption of Trace Gold in Geochemical Samples by Foam Plastics
Liu Tongtong, Huang Dengli
(Zhangye Geo-mine Survey Institute of Non-ferrous Metal Geological Exploration Bureau of Gansu Province)
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投稿时间:2020-08-17    修订日期:2021-01-27
中文摘要: 探讨了聚氨酯泡沫塑料的预处理,样品浓度,水洗条件,基体元素对金吸附率的影响。结果表明,用泡沫塑料吸附含金量为5ng-500μg的溶液,吸附率均在90%以上。影响聚氨酯泡沫塑料吸附率的重要条件是振荡前要用水充分浸透,水洗基体元素,矿渣宜在酸性环境下进行。铁、钛等离子可以提高吸附率,钠,钙,锌,矿渣等影响不显著,铝离子有微弱的拟制作用。ICP-MS的灵敏度与介质的雾化率有一定的相关性,应当使用硫脲介质的工作溶液作为工作曲线,内标元素可用103Rh或185Re,但是对于高W样品,只能使用103Rh。用金矿石国家标准物质做精密度与准确度验证,测定值与标准值无显著差异,标准偏差(RSD)均小于10%,精密度能满足地球化学样品中的痕量金的分析要求。
Abstract:Abstract:The research of gold adsorption rate by foam plastics for pretreatment, washing , matrix elements, thiourea desorption conditions and different concentrations. The results showed that the gold content of the solution adsorbed by foam plastics ranged from 5 ng to 500 ug, and the adsorption rate was above 90%. The key pretreatment to affect the adsorption rate of foam plastics is to soak it fully with water before oscillation. washing matrix elements and slag should in acidic solution, alkaline solution is more likely to cause losses. Iron and titanium can improve the adsorption rate,sodium, calcium, zinc and slag are have less of effect,aluminum can cause little inhibition . The sensitivity of ICP-MS has a certain correlation with the atomization rate of the medium. The working solution of thiourea medium should be used as the working curve. The internal standard elements can be 103rh or 185re, but only 103rh can be used for high W samples.The method is accurate and reliable, The results show that RSD <10%,and it can meet the requirements of gold analysis and analysis in geochemical samples.
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刘彤彤,黄登丽.聚氨酯泡沫塑料吸附ICP-MS测定地球化学样品中的痕量金[J].中国无机分析化学,2021,11(2):45-50.
Liu Tongtong,Huang Dengli.Adsorption and Thiourea desorption of Trace Gold in Geochemical Samples by Foam Plastics[J].Chinese Journal of Inorganic Analytical Chemistry,2021,11(2):45-50.

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