METHODS for the determination of ascorbic acid have recently been much discussed. Tillmans' method, as modified by Harris and Ray1, is generally accepted as more specific and simpler than the other methods proposed.
Harris and Ray, Biochem. J., 27, 303 (1933).
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CHEFTEL, H., PIGEAUD, M. Estimation of Ascorbic Acid (Vitamin C) by Titration. Nature 138, 799 (1936). https://doi.org/10.1038/138799b0