Separation and Determination of Different Iodine Species in Groundwater and Soil Samples

In this study, iodide and iodate in samples were adsorbed in exchange column containing 717 strong-base anion exchange resin. Then iodate and iodide are effectively eluted by 30 g/L sodium chloride solution and 2.0 mol/L sodium nitrate solution and collected separately. Iodide and iodate in the eluates are then determined with iodine-starch colorimetry. The method provides the advantages of high precision, simple operation and has been applied to the determination of different iodine species in groundwater and soil samples from high-iodine areas in China.