Determination of Maleic Hydrazide. III:Ultraviolet Spectrophotometric Determination

概要

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Since the diethanolamine solution of maleic hydrazide is used as a budding suppression agent of tubers such as those of potatoes, the determination of maleic hydrazide in the agent is necessary in connection with its application. The determination of maleic hydrazide by polarographic method was proposed by one of the authors but the precision of this method was not satisfactory. Therefore, a new method of determination with more precision has been investigated. In this study, maleic hydrazide and its diethanolamine salt have been determined rapidly by the ultraviolet spectrophotometric method. The maleic hydrazide samples containing no diethanolamine are so dissolved in water or 0.0015-0.15 M H2SO4 solution that the concentration of maleic hydrazide is 20 γ per ml. The optical density of the solution is measured at 302 mμ. The samples containing diethanolamine salt are dissolved in 0.001-0.3 M diethanolamine solution and the optical density of the solution is measured at 325 mμ. Or the samples containing diethanolamine salt are dissolved in 0.0015-0.15 M. H2SO4 and the optical density of the solution is measured at 302 mμ. With the use of these procedures, the optical density is not influenced by the presence hydrazine sulfate or maleic acid as impurities, unless the amount is not too large.
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