Adsorption and Thiourea desorption of Trace Gold in Geochemical Samples by Foam Plastics
Received:August 17, 2020  Revised:January 27, 2021
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DOI:10.3969/j.issn.2095-1035.2021.02.010
KeyWord:foam plastics; gold; geochemistry samples;ICP-MS
     
AuthorInstitution
Liu Tongtong 甘肃有色金属地质勘查局张掖矿产勘查院
Huang Dengli 甘肃有色金属地质勘查局张掖矿产勘查院
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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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