Abstract
A modification of a routine method for the determination of isoniazid in mixtures with sodium p-aminosalicylate in tablet form is described. After the removal of interfering tablet excipients with hydrochloric acid the isoniazid is determined by reduction of the hydrazine group with a zinc-copper couple in potassium hydroxide to ammonia which is absorbed in standard acid the excess of which is titrated with standard alkali.

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