示波极谱法直接测定水中超痕量钨

Single-Sweep Polarography Determination of Trace Amount of Tungsten in Water

本文对钨—溴邻苯三酚红极谱催化波进行了研究,发现体系中加入四乙基碘化铵后,极谱渡高明显增加,体系的稳定性显著提高,检出限达1.8×10^(-11)mol/L。确定了最佳条件,拟定了不经分离富集直接测定水中痕量钨的方法。此外还对极谱波性质进行了探讨,证明该极谱波为配合物吸附催化氢波,讨论了阳离子表面活性物质对催化氢波的作用机理。

The catalytic wave of tungsten-bromopyrogallol red complex was studied in the paper. Added with tetraethylammonium iodide, the peak current increased greatly, and the stability of system improved. The limit of detection for tungsten is 1.8×1^(-11)mol/L. The method has been applied to the determination of ultratrace amount of tungsten in natural water without pre-concentration. The behaviour of catalytic wave was investigated and the mechanism of the action of surfactants on hydrogen wave was discussed.