摘要
在1.4～2.4mol/LH_2SO_4介质中,Nb(V)与H_2O_2形成1:1的稳定络合物。定量加入过量硫酸亚铁铵,将Nb(V)-H_2O_2破坏,用Co(SO_4)_2滴定剩余的亚铁,测定铌的含量。一定量的V、Ta、Mo、W、Fe及Ti等存在不干扰测定,方法简便、快速。可用于直接测定铌钽精矿中的铌。
It was found that niobium(V) reacts with H2O2 to form a stable complex in a medium of 1.4-2.4 mol·L-1H2SO4, and the molar ratio of Nb to H2O2 is 1:1. An excess of standard ferrous sulfate was added to the peroxide complex and the Nb content can be found by back titration against standard eerie sul-fate. Amounts of V, Ta, Mo, W or Fe, 2.5, 2.0, 1.5, 0.75 and 0.75 times that of Nb, not interfere with the titration of 2 mg Nb. The metnod has been successfully used to determine Nb in niobium or tantalum concentrases without prior separation.
出处
《岩矿测试》
CAS
CSCD
北大核心
1989年第1期28-32,共5页
Rock and Mineral Analysis
