NK8310螯合树脂分离富集地质样品中痕量金银铂钯及其测定

摘要

研究了硫脲螯合树脂(NK8310)分离富集地质样品中痕量Au、Ag、Pt和Pd的实验条件。在φ=10%的王水介质中，［AuCl4］-、［AgCl2］-、［PtCl6］2-和［PdCl4］2-定量吸附于树脂上并与大量贱金属分离；用5 g/L硫脲-0.12 mol/L"HCl溶液洗脱Au、Ag、Pt和Pd，回收率为97%～104%。用硫镍矿管理样以及国家一级标准物质进行分析验证，分析结果与推荐值及标准值吻合，表明NK8310螯合树脂适用于地质样品中Au、Ag、Pt和Pd的分离富集。%The sorption characteristics of the thioureido chelate resin （NK8310）for Au(Ⅲ), Ag(Ⅰ), Pt(Ⅳ), Pd(Ⅱ) and the appropriate eluant for simultaneous elution of these elements have been investigated. The acidity of sample solution, column height, column flow rate, concentration and volume of eluting agent were also studied. The results show that ［AuCl4］-、［AgCl2］-、［PtCl6］2-、［PdCl4］2- are enriched on the NK8310 chelate resin column in 10% aqua regia solution and separated from base metals.Au, Ag, Pt, Pd sorbed on the resin can be quantitatively eluted with 5 g/L thiourea-0.12 mol/L HCl and determined by atomic absorption spectrometry. Recoveries of these noble metals are in the range of 97%～104%. The method has been applied to the determination of these elements in geological standard reference materials.The results obtained are in agreement with the recommended values of standard reference materials.It is proved that NK8310 chelate resin is suitable for separation and preconcentration of Au, Ag, Pt and Pd in geological samples.