Abstract
In a group of natural marine apatites Ca5(PO4)3(F, OH), organic ĊH3, ĊH2—R, HOĊHR, (CH3)2—ĊR, and —Ċorg radicals are identified by EPR. The relation between the EPR spectra of the observed organic radicals, the valence form, and the structural location of impurity vanadium ions (V4+ (VO2+) on the Ca2+ II site or V5+ (VO4)3- → (PO4)3-) is established. The structure of organic radicals correlates with the type of organic matter in the sample under analysis: sapropelic or humic, depending on the climatic conditions of mineral genesis.
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