Simultaneous Determination of Hydrazine, Methylhydrazine and 1,1-Dimethylhydrazine in Waters by HPLC with Spectrophotometric Detection Using Catalysis to Obtain DerivativesстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 27 октября 2021 г.
Аннотация:A simple, rapid, and sensitive method is developed for the simultaneous determination of hydrazine,methylhydrazine, and 1,1-dimethylhydrazine in waters based on precolumn derivatization with benzaldehydeand the determination of the resulting products by reversed-phase HPLC with spectrophotometricdetection at 300, 282, and 298 nm, respectively. The effect of imine and micellar catalysis is applied for thefirst time to obtain hydrazine derivatives on their simultaneous presence. The conditions of derivatization arechosen: the type, pH and concentration of the buffer system; the concentration of the reagent and the surfactant;and the temperature and duration of the reaction. It is found that the derivatization reaction proceedscompletely at pH 9.4 in the presence of a catalytic system based on 0.6 M ammonium and 87 mM sodiumdodecyl sulfate, and also 3.5 mM reagent at room temperature for 5 min. The quantitative yield of the derivatizationproducts is confirmed by ion chromatography. The limits of detection (S/N = 3) without additional preconcentrationare 0.3, 2.3, and 1.3 μg/L, and the linearity range is 1–500, 7–1000, and 5–1000 μg/L for hydrazine,methylhydrazine, and 1,1-dimethylhydrazine, respectively.