The interaction of Os(IV) ions with morin, quercetin, luteolin has been investigated and the spectrophotometric methods of osmium determination using these reagents have been elaborated. The influence of various factors and the maximum yield of the products of Os(IV) ions interaction with flavonoids have been determined. The change of electronic absorption spectra depending on the duration of the solution heating in a boiling water bath in the presence or absence of atmospheric oxygen as well as the interaction of osmium(ІІ, ІІІ, VІ and VІІІ) ions with flavonoids investigated have been shown. The redox nature of osmium(IV) ions interaction with morin and quercetin has been confirmed.
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