An extractionspectrophotometric method for the determination of hydrazine, based on its reaction with 2-hydroxy-I-naphthaldehyde at 100 "C, is described. Beer's law is obeyed between 35 and 700 ng ml-1 of hydrazine. The molar absorptivity at 41 2 nm is 27 000 I mol-1 cm-1. The method described has been applied satisfactorily to the determination of hydrazine in feed waters for steam-generating boilers.
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