ジンコン-過酸化水素系におけるマンガン(II)の接触効果

概要

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Decomposition of zincon(H_4 zincon) by hydrogen peroxide is catalysed by manganese(II). The reaction is assumed to proceed according to the following rate equation. - (d[H_4 zincon]/dt=k*[H_4 zincon]. (1)where k* is the apparent rate constant. The value of k* is evaluated by k*=(In(A_1/A_2))/(t_2-t_1) (2)where A_1 and A_2 are the absorbance of the undecomposed zincon at the reaction time t_1 and t_2, respectively. The plot of logarithm of absorbance vs. reaction time was linear during 15 min. The apparent rate constant k* increased with the rise of temperature from 5 to 35℃. The reaction proceeds in the pH range 9.1〜11.6 and the apparent rate constant k* is maximum at around pH 9.7, while the decomposition of zincon in the absence of manganese(II) was negligible. The value of k* is nearly proportional to the concentration of manganese(II) from 0 to 0.10μmol dm^<-3>. The decomposition of zincon also procceds in the absence of hydrogen peroxide, although the reaction is very slow as compared with that in the presence.
社団法人日本分析化学会の論文
1977-05-05