2-(2-チアゾリルアゾ)-4-メチルフェノールによるコバルト及び亜鉛の抽出

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The basic data for a quantitative study of the extraction equilibria of the cobalt(II) and zinc(II) chelate of 2-(2-thiazolylazo)-4-methyl phenol (TAC) were obtained spectrophotometrically. The extraction of cobalt(II) or zinc(II) chelate of TAC into benzene was investigated by keeping the ionic strength 0.1 with sodium perchrolate at 30℃. The absorption spectra of cobalt(II) or zinc(II) chelate at various concentrations of hydrogen ion and metal ion in aqueous phases were measured. It was found that only one species of chelate was formed. The analysis of the relationships between the distribution ratio of cobalt(II) or zinc(II) chelate and the hydrogen ion concentration of aqueous phase, or reagent concentration in organic phase has shown that two reagent molecules are involved in chelation and two protons are released. This indicates the formation of a 1 to 2 neutral chelate. Logarithmic extraction constants of cobalt(II) and zinc(II) chelate were determined to be -6.18±0.12 and -8.99±0.11, respectively. The theoritical calculations showed the possibility of separating cobalt(II) or nickel(II) from zinc(II) by using the extraction constants, but the separation of cobalt(II) from zinc(II) required back-washing. The experimental data were in good agreement with theoretical results.
社団法人日本分析化学会の論文
1976-07-10