Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Studies on the Metal Cupferrate Complexes-1 Spectrophotometric Determination of Cupferron

Metal Cupferrate Complex에 關한 硏究 (第1報) 分光 光電法에 의한 Cupferron 定量

  • Si-Joong Kim (Department of Chemistry, College of Liberal Arts and Sciences, Korea University)
  • 김시중 (高麗大學校 文理科大學 化學科)
  • Published : 19630300
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Abstract

A new method determining the micro amount of cupferron spectrophotometrically was investigated and was considered on the various factors which affect on the method. The method was as follows; ferric alum solution was added in a suitably acidified solution of cupferron. After the precipitates of Fe(Ⅲ)-cupferrate were formed, they were extracted with chloroform and the absorbancy of the organic phase was measured by spectrophotometer, Beckmann Model B (1cm quartz cell). The stable maximum wavelength was 325 $m{\mu}$ at 3.0 to 5.6 of the optimum pH and it obeyed on Boer's law in the range of 5.76 ${\gamma}/ml$ to 74.80 ${\gamma}/ml$ of cupferron. The maximum wavelength was independent on pH, concentration of cupferron and of ferric alum. The absorbancy at 325 $m{\mu}$ was not affected by $SO_4^{--}$ and Ac, but was varied by $Cl^-$ and $NO_3^-$. Sulfuric acid and acetate buffer are preferred to the acid and buffer solution adjusting the pH. At higher acidity, however, the absorbancy was somewhat lowered because of the decomposition of cupferron, and at too high concentration of ferric alum, it was also decreased because of the difficulty in the extraction. By this method, it was able to determine cupferron quantitatively in the percent error of 1.18.

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References

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