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The glycerol is quantitatively oxidized to formaldehyde by periodic acid, using a five minute oxidation period to minimize oxidation of glucose. The iodate and periodate are reduced to iodide by a large excess of sodium arsenite and the formaldehyde then determined directly in the oxidation mixture, by the color reaction with chromotropic acid. The precision of the method is about ± 2% in the range 2 to 8 p.p.m. of glycerol. The error due to glucose, in quantity equal to the glycerol, is only 2.5 to 5.0% and can be easily corrected for when the glucose content of the solution is known. One worker can analyze 40 to 60 samples per day.
Lambert et al. (Wed,) studied this question.