金橙G螯合形成树脂分离富集地质样品中微量贵金属研究Ⅱ——铑的分离富集测定

STUDY ON SEPARATION AND PRECONCENTRATION OF TRACE NOBLE METALS IN GEOLOGICAL SAMPLE WITH CHELATE FORMING RESINS Ⅱ Separation and Preconcentration of Rh by Gold Orange G

主要报道了用金橙Ｇ螯合负载形成树脂分离富集地质样品中贵金属Ｒｈ的方法。在最佳试验条件下Ｒｈ的回收率可达９５％～１０５％之间；其相对标准偏差为４．４９％；百分相对误差较小，为－２．４％；方法无系统误差；用硫脲洗脱，该负载形成树脂不被破坏，重复使用５次，树脂均未见异常，均能定量回收，回收率在９８．５％～１０４％之间，符合要求。说明，这种负载形成树脂也较稳定。

A method for separation and the preconcentration of trace Rh in geological samples with Gold Orange G chelate forming resin is discribed in this paper. Experiments have shown that Rh in solution are enriched on gold orange G chelate forming resin column in pH1.0 hydrochloric acid without adsorping other matrix metal ions, and is eluted with 3% thiourea. The covery of Rh is between the 95% and 105% at the optimol condition selected through experiments. The relative stan ard deviation (n=6) is 4.49% for Rh. The accuracy of the method is checked by the analysis of a standard sample (72-Pt-02) adding standard of Rh. The relative error of the method is ±2.47%. The method is without systematical error by t checking (t=1.38<t 0.5,5 =2.57). The results of experiments have shown that gold oronge G chelate forming resin can be used repeatedlly more than five times with no obvious change in adsorption performance. This chelate forming resin by means of sulphonic acid group as exchanging group, with (N,0) chelate group and monouzo-agent is stability, and it can be also used on separation and preconcentration of trace precious metals in relative geolagical samples.