Citation: Shu Bo HAN, Zhuo Bin YUAN. A POLAROGRAPHIC CATHODIC WAVE OF VITAMIN C[J]. Chinese Chemical Letters, ;1991, 2(2): 185-188. shu

A POLAROGRAPHIC CATHODIC WAVE OF VITAMIN C

Department of Chemistry, Graduate School, USTC, Academia Sinica, Beijing 100039, P. R. China

Received Date: 20 August 1990

Fund Project: Project supported by National Natural Science Foundation of P.R.China and by Foundation of Lab of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Academia Sinica.

The cathodic wave of vitamin C has not been reported in the literature so far. Its E_½ was found at-1.85 volt vs. Ag/AgCl (25℃) in the base solution of 0.1mol/L Bu₄NI. Various electrochemical and spectral techniques were used for studying the electrode reaction. They all showed that the electrode reaction was quasi-reversible while C was more than 1.0×10^-6mol/L and mainly adsorptive while C was less than 1.0×10^-6mol/L at a mercury electrode. The electron transfer number was 2 and the electron transfer coefficient 0.57. Using DPP techniques, the linear response range was 5.0×10^-7-2.0×10^-3mol/L and the detection limit 1×10^-7mol/L.
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