Determination of Iodide as an Organic Derivative by Gas‐Chromatography

Abstract

A simple and specific method is described for the analysis of iodide in trace proportions. The method is based on the reaction of iodide with pentafluorobenzyl 5‐dimethylamino‐1‐naphthalenesulfonate.in a biphasic system. The resulting derivative was determined on a gas chromatograph with a flame‐ionization detector. The detection limit was about 8 nmol of iodide in 1.0 mL of aqueous sample (S/N = 2; sample size, 5 μL). Application of the method to the analysis of available iodine in povidone‐iodine solution proved feasible.