Spectrophotometric determination of oxalic acid in presence of glyoxylic acid and chloride |
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Authors: | G Pierre MEl Kordi G Cauquis |
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Institution: | Laboratoire de Chimie Organique Analytique (UA CNRS 321), Université Scientifique et Médicale de Grenoble, B.P. 68, 38402 Saint Martin d''Hères Cedex France |
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Abstract: | Glyoxylic acid gives a yellow 1:1 complex, FeCHOCOO]2+ with iron(III). The dissociation contant, measured by two spectrophotometric methods, is K = 9.7 ± 1 mol l?1. Oxalic acid gives two complexes with iron(III) which absorb in the same range around 400 nm. With appropriate precautions and corrections, oxalic acid concentrations of about 10?1–10?2 M can be determined in the presence of glyoxylic acid and chloride. |
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