The primary objective of this study was to develop a simple method that can be used to extract the more readily mobilizable iodine species from soil while at the same time minimizing the transformation between IO3 and I, the two most commonly found iodine species in the soil. High performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (HPLC-ICP-MS) was used for iodine speciation analysis in soil. A sample pre-treatment process based on alkaline extraction in the presence of EDTA was optimized for the extraction of these iodine species. Good results were achieved using 10% ammonium hydroxide (v/v) and 0.5 mM EDTA where the transformation between IO3 and I was clearly minimized. The method was applied to several soil reference materials. Recoveries of IO3 and I spiked into these materials ranged from 85 to 115%. The most suitable sample collection and soil preparation techniques were also evaluated in this work.

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