Abstract
2-Hydroxy-1-naphthaldehyde (I) combines with hydrazine giving aldazine (II) in diluted sulfuric acid, which shows a strong yellow-green fluorescence. This reaction may be used for the microdetection of hydrazine and isonicotinic acid hydrazide, which is easily hydrolysed to hydrazine by aqueous sodium hydroxide. The limit of detection of these compounds in one drop of water is 0.01γ and 0.1γ, respectively.
The fluorescence of (II) has the maximum intensity at 534mμ. This intensity shows a linear correlation with the concentration of hydrazine in a range of 0.02-0.8γ/cc. and of isonicotinic acid hydrazide in a range of 0.4-12.5γ/cc. (Fig. 2). This method of estimation of the two compounds is interfered by only a few substances.
