The incrcasecl commercial availability of hydrazine and its congeners and their cxtcnsive USC as industrial chemicals and rocket fuels 1~~a.s led to the development of numerous methods for the clctcrmination of thcsc compounds, separately and in mixtures. The majority of thcsc have been b,ascd on titration of hyclrazincs citlicr as bascsl or as reducing agcntsllZ. The familiar reaction between a hyclrazine and an aldchyclc to form a hydrazone leas also been widely utilized. Several authorsc-6 have clctcrminctl hydrazinc by measuring the absorbance of the product formed from its reaction with +l.imetl~ylaminobenzalclchycle.
After reaction of the sample with salicylaldchyclc, nonaqueous titrimetry has been usccl in analyzing mixtures of hydrazinc and x,1-cIin~ctl~yll~yclrazinc (UDMH) 017 ancl mixtures of hydrazinc and x-methylhydrnzine (MMH) 8. A polarographic method has been reported for analyzing mixtures of the 1~cnzalcI~~ycle derivatives of hydrazine and UDMH, but it was not applied to mixtures of the hydrazincs thcmsclvcs".
This paper reports a simple spectrophotometric analysis which is based on the well-known rcnction of hydrazine ancl 1,x-climethylhydrazinc with salicylaldehyde to yield products with well-defined ultraviolet spectra and high molar absorptivitics. The interference caused by spectral overlap and the prcscncc of excess salicylaldehyde is corrected, for by considering the contribution of all absorbing species to the absorbance measured at a specific wavelen@hr~-12.
The procedure and results are presented for the analysis of hyclraaine and x,1-climethylhydrazine, separately and in mixtures.