Separation of iodine species by adsorption chromatography

Based on the different properties of iodide and iodate species in some sorp tion materials a new chromatographic method was developed to study the spec iation of iodine in a mangrove system. Two sorption materials, alumina and silica. were investigated and several distribution coefficients for iodide and iodate were determined at different concentrations of NaOH, NaNO3 and N aHCO3 solutions. The best separation results were obtained percolating sea water samples, containing iodine species, through a glass column filled wit h alumina. The iodide passed through the column after washing the column wi th 0.1 M sodium nitrate solution, and the iodate was eluted with a 0.5 M so dium bicarbonate solution.