AU122: The Determination of Iodide in Brine

Instrument Type: IC

In this Application Update, ion chromatography coupled with pulsed amperometric detection is used to determine iodide in brine (approximately 30% sodium chloride). This method is specific, sensitive, and rapid. Sample preparation is a simple sample dilution. Iodide is separated on the Dionex IonPac AS11 column, which contains a hydrophilic resin that is well suited to the chromatography of iodide, a relatively hydrophobic anion. Using a nitric acid eluent, the iodide ion elutes from the column in under five minutes.

AN37: Determination of Iodide and Iodate in Soy- and Milk-Based Infant Formulas

Instrument Type: IC

This application note includes the acetic acid digestion method for iodide extraction, coupled with an IC-PAD method for iodide detection. The IC method coupled with electrochemical detection allows for selective and sensitive determination of iodide in complex matrices. The acid digestion procedure to extract iodide was optimized for milk- and soy-based infant formulas. Sample preparation conditions to convert iodate to iodide for determining total iodine (i.e., iodide and iodate) are presented. This method is shown to be fast, robust, and sensitive.