Contrary to previous reports ethanol has been found to interfere with the colorimetric determination of formaldehyde and glycollic acid with 1,8-dihydroxynaphthalene-3,6-disulphonic acid (chromotropic acid) or 2,7-dihydroxynaphthalene in concentrated sulphuric acid. The effect is greater for glycollic acid than for formaldehyde. The mechanism for these observations is given.
R. H. Still, K. Wilson and B. W. J. Lynch, Analyst, 1968, 93, 805 DOI: 10.1039/AN9689300805
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