Abstract
A simple micromethod is described for the determination of hydrazines using the copper ion-selective electrode. The method is based on direct potentiometric titration of the sample in ammoniacal solution of pH 9.5±0.2 with copper(II) ions at room temperature. N-Shaped curves with well-defined inflections at 1∶1 and 1∶2 molar ratios are obtained. This is probably due to the formation of copper monohydrazinate and copper dihydrazinate complexes. Various alkyl and aryl hydrazines and hydrazine salts have been satisfactorily analyzed with an average recovery of 99.4% and a relative standard deviation of ±0.4%. The reaction of hydrazines with Fehling's solution followed by measuring the copper(I) oxide formed using the copper ion-selective electrode also has been investigated.
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