Determination of Ge in Au alloys using sodium hypophosphite and potassium iodate potentiometric titration method  

作　　者：Shou-Li Han Xiao-Tang He Jun-Mei Guo Zhao-Ying Ren Li-Ya Zhu Liang-Wei Chen Qing-Nan Shi Jia-Hong Yi 

机构地区：[1]School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,650093,China [2]State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Sino-Platinum Metals Resources(Yimen)Co.Ltd.,Yimen,651100,China

出　　处：《Rare Metals》2020年第12期1492-1496,共5页稀有金属（英文版）

基　　金：the National High Technology Research and Development Program of China (Nos.2012AA063203 and 2012AA063207)。

摘　　要：This paper presents a new method of determining Ge in AuGe alloys by potassium iodate(KIO3)potentiometric titration when Ge(Ⅱ)and Au(0)are simultaneously reduced from Ge(Ⅳ)and Au(Ⅲ)by sodium hypophosphite rather than by distillation separation.The influences of such conditions as the reduction acidity,the dosage of sodium hypophosphite and the reduction time on the determination of Ge were studied.Ge in AuGe alloys such as AuGe_(12),AuGeNi_(12-2),AuAgGe_(18.8-12.5),and AuAgGeNi_(43.8-6-0.2)was measured with the relative standard deviation(RSD)of 0.10%-0.31%and the recoveries of added standard Ge in sample of 99.40%-100.40%under the conditions of 0.40-0.80 mol·L^(-1)HCl,3.3 mol·L^(-1)H^(3)PO^(4),15 g sodium hypophosphite,and reduction time of40 min.The new method presented is of high accuracy in results,good stability and sensibility in end-point,and easy operation and strong selectivity of determination.

关 键 词：Ge determination AuGe alloy Sodium hypophosphite Potassium iodate Potentiometric titration 

分 类 号：TG115.313[金属学及工艺—物理冶金]