钨—对乙酰基偶氮羧络合物极谱催化波的研究

Study on Catalytic Wave of Tungsten-p-Acetylcarboxylazo Complex

在HCl介质中,W(Ⅵ)与对乙酰基偶氮羧络合物有一灵敏的极谱催化波,峰电位在-114V(vs.SCE),W浓度在2.2×10^(-9)～2.2×10^(-7)mol/L范围内与峰电流呈线性关系,检测限8×10^(-10)mol/L,常见共存离子不干扰测定,实验结果表明,该波为氢催化波.

A new catalytic polarographic wave of tungsten has been suggested. The tungsten-?acetyl-carbo-xylazo ccimplex has a sensitive hydrogen catalytic wave in 0.06 mol/L HC1 supporting electrolyte.The peak potential of the wave is -1.14 V(vs.SCE).A linear relationship between peak current and concentration of W(VI) holds in the range 2.2× 10-9-2.2x 10-7 mol/L. The detection limit of tungsten is 8×l0-10 mol/L.Electrochemical experiments sho'w that it is a hydrogen catalytic wave.The method has been successfully applied to the determination of trace amounts of W in minerals and ores.