Abstract
Attempt was made to determine the quantity of primary amine in aqueous solution of amines by the yellow coloration of the Schiff base formed from a primary amine and 3, 5-dibromosalicylaldehyde in ethanol. Determination conditions were established for methylamine hydrochloride, homosulfanilamide, aniline, and sulfanilamide. The best result was obtained by colorimetry at a wave length of 425mμ in pH 5.1 solution. This determination is not affected by the presence of secondary and tertiary amines, or ammonium salt in amount less than 200, 500, and 500γ/cc., respectively. The acid amide does not show this coloration.
