過酸化水素の存在における4-(2-ピリジルアゾ)-レゾルシノールによるクロム(III)の吸光光度法

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We found that the reactivity of chromium(III) with complexing agents was accelerated when the oxidation state of chromium(III) was turned to change to (IV) or (V) in the presence of hydrogenoeroxide. Consequentry, we applied the finding to the reaction of chromium(III) and 4-(2-pyridylazo)-resorcinol (PAR) to obtain more sensitive and simple method for the determination of chromium(III). A given quantity of chromium(III), 2ml of 5.00×10^<-3>M PAR, 2ml of 2M acetic acid-sodium acetate buffer solution, and 3ml of 1M hydrogen peroxide were pipetted into a 100ml Erlenmeyer flask fitted with a plug. The final volume was brought to 50ml by the addition of redistilled water. The solution was warmed for 20 min at 40℃ in a thermostatically-controlled water bath. After cooling to room temperature, a portion of the solution was then transferred into a cell. The measurements of absorbance were made at 530nm. The calibration curve was obtained by the above procedure for the concentration range of (0.10〜0.52)μg ml^<-1> of chromium(III). The molar absorptivity at 530nm was calculated to be 5.1×10^4l mol^<-1> cm^<-1>. The method is very sensitive and simple.
社団法人日本分析化学会の論文
1978-07-05