Vitamin methods

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Abstract
The method involves the use of a special Hg-Pt double electrode (Hg-coated Pt wire) and has given good results with vegetable and fruit extracts colored or uncolored. An explanation is given of the probable mode of function of the electrode. Comparisons with the direct visual titration method (Harris and Ray) have shown agreements to within 1-2%. In control tests ascorbic acid in concs. of 0.2-0.02 mg./ml. is recovered with an error of less than 0.5-2%. An alternative electrometric procedure for estimating vit. C in the presence of high concs. of interfering reducing substances involves the use of a polarized bright Pt electrode.