Solid-phase spectrophotometric determination of trace amounts of hydrazine at sub-ng ml−1 level

A very sensitive method for the determination of trace amounts of hydrazine by Solid-phase spectrophotometry has been developed. The method is based on the fixation of an aldazine derivative of hydrazine on a cation-exchange resin and the resin phase absorbance being measured directly. It allows the determination of hydrazine in the range 0.08–1.20 ng ml−1 (with a RSD of 3.4% and an apparent molar absorptivity of 2.7 × 108 1 mol−1 cm−1). The method was applied to the determination of hydrazine in boiler feed and natural water samples, urine and isoniazid tablets.