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Indirect polarographic determination of aldehydes in the presence of ketones

M. Fedoroňko, J. Koenigstein, and M. Bullová

Institute of Chemistry, Slovak Academy of Sciences ,Bratislava


Abstract: A method for indirect polarographic detn. of H2CO and AcH in the presence of Me2CO and MeCOEt is described. This method is based on the great reactivity of aldehydes with o-phenylenediamine and iso-BuNH2 and can be used for quant. analyses. Benzimidazolines are formed by the reaction of the aliphatic aldehyde with o-phenylenediamine in a phosphate buffer at pH 6.0 and 20°. They can be identified by the anodic waves. The imines are formed by the reaction of aliphatic or aromatic aldehydes with iso-BuNH2 in iso-BuNH2 buffer at pH 10.4 and 20°. They can be identified by the cathodic waves. Both these reactions are not affected by the presence of the ketones. The error of the aldehyde detn. in the concn. range 2 × 10-4-10 × 10-4 and in the presence of ketones is ±2%.

Full paper in Portable Document Format: 221a25.pdf (in Slovak)


Chemical Papers 22 (1) 25–33 (1968)

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