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Citation: Zhu Yong-Chun, Dong Shao-Jun. Determination of Parameters of Fast Chemical Reaction of Alizarin Red S by Spectroelectrochemical Method with Loptlc[J]. Acta Physico-Chimica Sinica, ;1990, 6(02): 196-202. doi: 10.3866/PKU.WHXB19900213 shu

Determination of Parameters of Fast Chemical Reaction of Alizarin Red S by Spectroelectrochemical Method with Loptlc

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun

Received Date: 3 May 1988
Available Online: 15 April 1990

The rate constant of very fast chemical reaction generally can be measured by electrochemical methods, but can not by the thin layer electrochemical methods because of the influence of diffussion effect. Long optical path length thin layer cell (LOPTLC) with large ratio of electrode area to solution volume can be used to monitor the fast chemical reaction in situ with high sensitivity and accuracy. It enables the absorption spectra to be measured without the influence of diffussion effect.
In the present paper, a fast chemical reaction of Alizain Red S (ARS) with its oxidative state ha been studied. The reaction equilibrium constant (K) under different potentials can be determined by single step potential-absorption spectra in LOPTLC. An equilibrium constant of 7.94×10~5 l·mol~(-1) for the chemical reaction has been obtained from the plot of lgK vs. (E-E~0′_1). Rate constant (k) under different potentials can be measured by single step potential-chronoabsorptionmetry. At rate constant of 426.6 l·mol~(-1)·s~(-1) for the chemical reaction has been obtained from the plot of lgK vs. (E_E~0′_1) with (E-E~0′_1)=0.
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