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Abstract
In fluorosulfuric acid, four different sulfur species: S2 +., S+., S(II+), S(IV+), 3 different selenium species: Se2 +., Se(II+), Se(IV+), and 3 different Tellurium species: Te2 2+, Te(II+) and Te(IV+) have been observed spectrophotometrically and electrochemically by varying the composition of the solvent from basic (non-oxidizing) medium (0.1M solution of NaSO3F) to oxidizing media (0.5M solution of SO3).