钛(Ⅳ)催化极谱的研究——应用于天然水中痕量钛的测定

(一)仪器 SJP-1A型示波极谱仪(浙江丽水无线电厂),阳极为饱和甘汞电极.毛细管特性:在蒸馏水中m=0.63毫克/秒,t=7.3秒,汞柱高度52厘米.(二)试剂 全部试剂均采用二级试剂,溶液均用重蒸馏水配制.

STUDIES ON CATALYTIC CURRENT OF TITANIUM(Ⅳ)IN POLAROGRAPHY-DETERMINATION OF TRACE AMOUNTS OF TITANIUM IN NATURAL WATERS

The polarographie behavior of the titanium(Ⅳ)-amygdalic acid-chlorate systetm has been stutdied.In 0.02M amygdalic acid 4% chlorate medium titanium(Ⅳ)gives a simple kinetioally controlled wave with Ep at -0.89 V vs.the S.C.E.The titanium wave is pargicu.Iarly interesting,because of its catalytic nature.As happens with mther complexing and oxidizing agents,the titanium(Ⅲ)formed at the dropping mercury electrode is oxidized back to titanium(Ⅳ).The resulting catalytic current depende on the rate of this subsequent oxidation.The titanium current allows the determination of titanium at concentrations as low as 10-9g/ml,Cu(Ⅱ),Pb(Ⅱ),Mn(Ⅱ),Cr(Ⅲ),Zn(Ⅱ)1000-fold and Mo(VI),V(Ⅴ)100-fold excess does not interfere.This method is suitable for the determination of trace amounts of titanium in natural waters(sea water,estuarine water,well water,etc.).