Studies on Determination of Ge in Au Alloys by Potassium Iodate Potentiometric Titration Method
The paper presents a new method of determining Ge in gold alloys by potassium iodate potentiometric titration rather than by traditional distillation separation. The influences of conditions such as the reduction acidity, dosage of sodium hypophosphite and reduction time on the determination of Ge were studied. Comparison was made between the influences of end-point indication for potential method and starch method on accruracy and precision of the analysed results, stability and sensitivity of end-point, selectivity of method and so on. The possibility of reaction in an electrochemical way was discussed. Ge in the alloys such as AuGe12, AuGeNi12-2, AuAgGe18.8-12.5 and AuAgGeNi43.8.6-0.2 was measured, respectively, with the relative standard deviation of 0.10％~0.31％ and the recoveries of added standard Ge in sample of 99.40％~ 100.40％ when the reduction acidity was 0.40-0.80 mol/L HC1 and 3.3 mol/L H3PO4,15 g sodium hypophosphite and reduction time 40 min. The new method presented is high accuracy and precision in results, good stability and sensibility in end-point, easy operation and strong selectivity of determination. When it is applied to analyse actual samples, satisfactory results are achieved.
analytical chemistry germanium gold alloy potentiometric titration
ZHU Liya XIE Hongchao CHEN Liangwei ZHOU Yu TAN Yanshan LIU Wen LI Yong HAN Shouli TAN Wenjin HE Xiaotan WU Xilong
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Sino School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 6 Yunnan Copper Co. Ltd., Dali 675600,Yunnan, China
国际会议
5th International Conference Platinium Metals(第五届国际贵金属会议)
昆明
英文
298-304
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）