极谱法同时测定硫酸锌中的锰和铁

SIMULTANEOUS POLAROGRAPHIC DETERMINATION OF MANGANESE AND IRON IN ZINC SULFATE

在三乙醇胺（ＴＥＡ）氢氧化钠乙二胺四乙酸二钠（ＥＤＴＡ）底液中，锰（Ⅲ），铁（Ⅲ）在单扫极谱仪上分别于－０．５２Ｖ（ｖｓ·ＳＣＥ，下同）和－１．１０Ｖ左右产生良好的还原波，一次导数波高与锰（Ⅲ），铁（Ⅱ）浓度分别在０．０１～３０ｍｇ／Ｌ和０．０４～４０ｍｇ／Ｌ范围内呈线性关系．方法操作简便，用于工业硫酸锌样品中锰、铁的同时测定。

In a supporting electrolyte containing triethanolamine (TEA),sodium hydroxide and EDTA, two sensitive polarographc waves of Mn(Ⅲ)TEA and Fe(Ⅲ)TEA complexes have been obtained by singlesweep polarography. The peak potentials of the two waves are0.52 V and1.10 V(vs·SCE),respectively. The calibration curves for Mn and Fe are linear in the respective range of 0.01～30 mg/L and 0.04～40 mg/L. This method is simple, rapid and accurate and has been applied to the determination of Mn and Fe in the samples of Zinc sulfate with satisfactory results.