1-(2-ピリジルアゾ)-2-ナフトールによるクロム(III)の溶媒抽出に及ぼす過塩素酸イオンの効果

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Effects of various anions on the solvent extraction of chromium (III) with 1-(2-pyridylazo)-2-naphthol (PAN) were studied and remarkable effects on the extraction were found in the presence of perchlorate ion. The procedures were carried out as follows : the mixture of aqueous solution containing chromium (III) and acetate buffer (pH 3.1) and 1 cm^3 PAN-methanol solution (0.2 %) was heated at 363 K for 120 min. After cooling to room temperature, 10 cm^3 of chloroform was added to extract the chromium (III)-PAN complex. The concentration of extracted complex depended on the acetate buffer concentration in the aqueous phase. Similarly the effects of the various anions on the extraction were studied. It was found that the spectra of the complex changed greatly in the presence of perchlorate ion and the intensity of absorption increased considerably. Furthermore, the extraction achieved quantitatively above 1 mol dm^<-3> of the anion.
1983-12-05