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.
出处
《分析试验室》
CAS
CSCD
北大核心
1992年第1期35-37,共3页
Chinese Journal of Analysis Laboratory
关键词
钨-溴邻苯三酚红
极谱催化波
钨测定
Tungsten determination
Catalytic polarographic wave
Tungsten-bromopyrogallol red complex
