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  • Author or Editor: L. Kershaw x
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The determination of isonicotinic acid hydrazide in the dosage form of isoniazid tablets is done using thermometric titrimetry. The hydrazide is oxidized by hexacyanoferrate(III) ions. It is not necessary to separate the active ingredients from the powdered sample. The results from the proposed method are compared with those obtained using the standard B.P. method.

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The oxidizing power of hexacyanoferrate(III) in alkaline conditions is wellknown. Unfortunately many if its oxidation reactions are too slow at room temperatures for direct titrimetric procedures.

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The advantages of using diodes as thermal sensors in solution thermochemistry are discussed and a simple, low-cost circuit for the use of diodes as temperature sensors is reported. In preliminary studies, the titration of TRIS and hydrochloric acid is used to compare the precision of thermistors and diodes in thermometric titrimetry. Several systems are assayed at various temperatures by enthalpimetric methods to illustrate the advantages of diodes as sensors for monitoring thermal methods capable of being used in quality control system.

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