【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^-8mol/L范围内与峰电流呈线性关系,检测限为1.1×10^-10mol/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。更多还原

【Abstract】 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^-8mol/L. The limit of detection for tungsten is 1. 1×10^-10mol/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.更多还原