Observation on the Removal Effect of Excess Iodide Ion by Dx Resin in the Experimental Water

China is one of the worst countries with high prevalence of iodine deficiency,at the same time there are districts with excess iodine.In this experiment Dxresin is screened by comparing several sorts of adsorption materials and ion exchange resins.Dx resins can dislodge the iodide ion in experimental water quickly,its removal rate is 99.87% in 2-hour dynamic experiment.Its exchange volume is large,1.5g Dxresin can dispose of the same condition water 275 litres and the concentration of iodide ion in filtered water is below 300μg/L,more than 320 litres come to saturation.Dx resin has strong competitive adsorption K_I^-/F^-=42.77,K_I^-/SO_4^2-=9.15,and its regenerative method is simple.So Dxresin is the to dislodge the iodide ion in the experimental water.