钨-溴邻苯三酚红极谱催化波的研究  

Study on the Catalytic Wave of the W-Bromopyrogallol Red Complex

作　　者：夏道沛[1] 管希云[1] 黄慧萍[1] 

机构地区：[1]中国地质大学应用化学系,武汉430074

出　　处：《分析试验室》1992年第1期35-37,共3页Chinese Journal of Analysis Laboratory

摘　　要：在HCl、KCl介质中,W(Ⅵ)与溴邻苯三酚红能产生一个灵敏的极谱催化波,峰电位为—1.22V(vs.SCE),W(Ⅵ)浓度在2.2×10^(-10)～4.4×10^(-8)mol/L范围内与峰电流呈线性关系,检测限为1.1×10^(-10)mol/L,实验表明,该波为具有吸附性质的氢催化波,可用于痕量钨的测定。A new catalytic polarographic system of tungsten has been suggested. The tungsten- bromopyrogallol red(BPR) complex has a sensitive catalytic wave in HCl-KCl supporting electrolyte. In a solution of 0. 04mol/L HCl, 0.056mol/L KCl and 0.001% BPR,the peak potential of the wave is -1.22V (vs. SCE). A linear relationship holds between peak current and concentration of W(Ⅵ) in the range of 2. 2×10^(-10)～4.4×10^(-8)mol/L. The limit of detection for tungsten is 1. 1×10^(-10)mol/L. The mech- anism of the wave has been investigated. Electrochemical experiments show that it is a hydrogen catalytic wave. The method has been successfully applied to the determination of trace amount of W in minerals and ores.

关 键 词：钨-溴邻苯三酚红 极谱催化波 钨测定 

分 类 号：O614.613[理学—无机化学]