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Polarographic studies of the oxidation of vitamin K5 in aqueous solution

✍ Scribed by Kiyoko Takamura; Fumiyo Watanabe

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
434 KB
Volume
74
Category
Article
ISSN
0003-2697

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✦ Synopsis

Electrochemical

behavior of 4-amino-2-methyl-1-naphthol hydrochloride (VK,) has been studied by dc and ac polarography in order to determine the applicability of these methods to the determination of VK, in aqueous solution. VK, exhibits two well-defined anodic waves on dc polarograms, one of which is due to the oxidation of VK, to the corresponding quinoimine and the other, to the formation of mercurous chloride on a dropping mercury electrode. Complete preremoval of dissolved oxygen makes the former wave reproducible, and its limiting current is found to be proportional to the VK, concentration ranging from 1 .O x IO+ to 1 .O x 10m3 M. On ac polarograms, electrooxidation of VK, also gives rise to a distinct peak whose height is proportional to the VK, concentration in the range of 5.0 x IO-' to 1.0 x 10m5 M. These facts can be applied to the microdetermination of VK, present in concentrations as low as the 0. I-ppm range. 512

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