フッ化物イオン及び塩化セチルピリジニウム共存下におけるハフニウム(IV)とο-ヒドロキシヒドロキノンフタレインとの反応の分析化学的応用

概要

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A rapid and simple spectrophotometric method for the determination of Hf(IV) and F〜 with o-hydroxyhydroquinonephthalein (Qn.Ph.) in the presence of cetylpyridinium chloride (CPC) and fluoride ion has been proposed. Hafnium(IV) reacted with Qn. Ph. in the presence of the excess CPG as a cationic surfactant and F〜, to form a colored complex which was soluble in water. The decrease in the absorbance of the Qn.Ph. solution and the increase in that of the Qn. Ph.-Hf (IV)-F^- solution were observed in the presence of GPG. The absorption maximum of the Qn.Ph.-Hf (IV)-F^- solution was about 555 run against the reagent blank, and its absorbance was constant hi the pH range of 4.5 to 6.3 in the presence of 2.0 × 10^<-3> M CPG. The calibration curves were linear in the concentration range of 0〜17.5 pg/10 ml for Hf(IV) and (1.0〜4.0)μg/10 ml for F^-, respectively. The Sandell sensitivities of this method were 0.0017μg/cm2 for Hf(IV) and 0.0013μg/cm2 for F^-, respectively. The apparent molar absorptivity at 555 nm was 1.2 × 10^5 1 mol^<-1> cm^<-1> for Hf (IV). The molar ratios of Hf(IV) to Qn.Ph. were found to be 1 : 2 in the presence of F^- and 1 : 1.5 in the absence of F〜, respectively.
社団法人日本分析化学会の論文
1984-03-05