利用银基球型汞膜电极连续测定矿物样品中微量铜铅镉锌等元素

本文应用电位法,采用各种酸性介质,极谱底液,在氧化电位大于+0.5V,氧化时间大于10秒的条件下,将残留于银基球型汞膜电极表面的各种干扰物质强制氧化,使其成为可溶性离子离开电极表面进入溶液,更新电极。利用本电极在极谱底液里测定镉,其结果与滴汞电极比较相当接近;未经分离连续测定矿石、矿物样品中常量和微量的铜、铅、镉、锌等元素,其结果与国家标准值相当吻合,回收率大,相对误差小,效果好。

The Utilization of the Silver Base Sphericity Mercury Membrane Electrode in Continuously Determining the Micro Cu~(2+)Pb~(2+)Cd~(2+)Zn~(2+) etc.in Mineral Samples

This paper deals with the electric potential method,with which different interference substances remaining on the surface of the silver base sphericity mercury membrane can be oxidized by using dif- ferent acid mediums and polarogram basic solution and on the condition that the oxidic potenlial is above+0. 5V and the oxidic time is over 10 seconds,ions becoming dissolvable that go into the solu- tion.This renewal of the electrode and the Cd~(2+)is determined by the renewed electrode in the polaro- gram basic solution,The contents of Cd~(2+)so determined quite approaches that determined by the drop- ping mercuty electrode.The contents of the Cu~(2+)Pb~(2+)Cd~(2+)Zn~(2+)etc.in the ore,each mineral sample is determined continuously without being seperated and each quite approaches the state's standard value, with the high rates of recovery,the small relative errors and the effects are good.