Silica gel modified by –CH2CH2CH2NH3X where X is chlorid, bromide, or iodide adsorbs sulphur dioxide selectively to form the halogenosulphinate ion SO2X–; the process reverses upon warming.
R. L. Burwell and O. Leal, J. Chem. Soc., Chem. Commun., 1974, 342 DOI: 10.1039/C39740000342
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