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FT-IR spectra of aqueous potassium hydrogensulfite solutions, with nominal concentrations between 0.1 and ~ 3.6 mol l -1 , were recorded as aqueous and freeze-concentrated solution from 295 to 230 K (from 4000 to 950 cm -1 ) and as glassy solution at 78 K (from 4000 to 400 cm -1 ). Whereas disulfite is only a minor species in dilute hydrogensulfite solution,...
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