活性铜粉置换金钯铂铑电流滴定铱  

Amperometric Titration of Iridium After Displacement of Gold Platinum Palladium and Rhodium by Active Copper Powder

作　　者：郭秋泉 

机构地区：[1]贵金属研究所,昆明650221

出　　处：《贵金属》1993年第3期42-46,共5页Precious Metals

摘　　要：提出了一种在Pt、Pd、Rh、Au、Cu、Fe、Ni、Zn存在下Ir的电流滴定方法。Au和Pd的干扰可在1mol/L HCl介质中用活性铜粉加热搅拌30min置换分离。经氧化并在HCl-H_2SO_4介质中用吹气法除尽过量氧化剂,用亚铁电流滴定。在确定的条件下,大量Au、Pd、Pt、Rh、Cl、Ni、Zn和两倍量的Fe不干扰。方法适用于贵金属中间产品与Pd—Ir合金中Ir的测定。其相对误差均≤0.1％。An amperometric titration method has been established for the determination of Ir in the presence of Pt, Pd, Rh, Au, Fe, Ni and Zn. Interference of Au^(3+) and Pd^(2+) can be eliminated by displacement of Au^(3+) and Pd^(2+) using active copper powder in the medium of 1mol/L HCl while sterring and heating for 30 min. Iridium can then be titration with Fe^(2+) after it's oxidization and expelling of excessive oxidant in HCl—II_2SO_4 medium. Under the definite condition, large amount of Pt, Pd, Rh, Au, Cu, Ni, Zn and twice amount of Fe did not interfere. The method can be applied to the determination of iridium in metallurgical intermediate products of precious metals and iridium alloys. In the determination of iridium in Pd—Ir alloys, the relative errors

关 键 词：铱 电流滴定 合金分析 

分 类 号：TG115.31[金属学及工艺—物理冶金]