フェニルフルオロンと塩化セチルピリジニウムを用いるスズ(IV)の吸光光度定量法(ノート)

概要

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By the addition of excess cetylpyridinium chloride-(CPC) and oxalic acid to Sn(IV)-phenylfluorone complex solution, the colour development of a water soluble complex is enhanced by catalytic action of oxalic acid. The absorbance of the water-soluble, reddish brown complex is constant over the pH range from 1.0 to 2.0. The sensitivity was 0.003 μg Sn(IV)/ cm2 for an absorbance of 0.001. The recommended analytical procedure is as follows. To the solution containing 05 μg/10 ml of Sn(IV), 1.0 ml of 5% CPC solution, 0.5 ml of 1.0 × 10-2 M oxalic acid, and 1.0 ml of 1.0 × 10-3 M methanolic phenylfluorone solution are added, and pH of the solution is adjusted to 1.0 by adding 3% sulfuric acid, the solution is diluted to 10.0 ml with water, and allowed to stand at 45°C for 20 minutes, the absorbance of Sn(IV)-phenylfluorone complex at 530 nm is measured against the reagent blank. The effects of diverse ions on the absorbance of the complex were examined.