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Wet chemical analysis and UV-VIS spectroscopy methods were used to determine the oxidation state of iron in Na 2 O·2SiO 2 glasses, containing 0.3 mol% of Fe 2 O 3 . The oxidation state of iron in the sodium silicate glasses was varied by changing the size of iron oxide particles used for preparation of glass batches and the melting temperature. In sodium silicate glasses iron commonly exists as an equilibrium mixture of ferrous ions, Fe 2+ , and ferric ions Fe 3+ . The increase of the meltingdoi:10.2298/pac1303117m fatcat:czspkllsf5apxc6cx467pmluru