Determination of iodide by high-performance liquid chromatography after precolumn derivatization

Derivatization od iodide into 4-iodo-2,6-dimethylphenol and HPLC of iodophenol with UV detection has been found to be a suitable method for the sensitive detection of iodide. The precolumn derivatization involved oxidation of iodide with 2-iodosobenzoate at pH 6.4 in the presence of 2,6-dimethylphenol. The reaction mixture was chromatographed on an octadecylsilane column using a mobile phase of acetonitrile-water, 60:40 (v/v), and detection at 220 nm