微量マンガン(II)及びその他の金属イオンの接触-光度滴定

概要

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A catalytic photometric titration method has been developed for the determination of micromolar amounts of manganese(II). Manganese(II) catalyzed reaction between hydrogen peroxide and anthraquinone dye, Acid Blue-45 (C.I. 63010), was utilized for the indication of the end-point and the absorbance at 596nm was followed spectrophotometrically. The recommended procedures are as follows : place 50ml portion of 0.4M sodium hydrogen carbonate solution containing known amounts of EDTA in the titration cell, add 0.5ml of 0.05% Acid Blue-45 and 1ml of 3% hydrogen peroxide, and then titrate the solution with manganese(II) solution {(10^<-3>〜10^<-4>) M}. At the end-point, the catalytic oxidation of the dye proceeds and the absorbance of the solution decreases rapidly. Manganese (II) at micromolar levels was determined within a relative error of ±2 % and with a coefficient of variation of 0.4%. The method has been applied to determine micromolar amounts of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) by back-titration of an excess of EDTA with standard manganese(II) solution.
社団法人日本分析化学会の論文
1981-12-05