Rapid microwave-assisted amplification for the spectrophotometric determination of iodine

Abstract

A fast microwave-assisted amplification procedure has been developed for the conversion of iodide to iodate by using periodate. Iodide is quantitatively oxidized with 0.013 mol dm^–3 KIO₄ solution in 4 min by using a closed PTFE reactor with 115 cm³ internal volume and a radiation power of 520 W. The amount of iodate formed is treated with an excess of iodide in acidic solution to produce iodine. A 24-fold amplification is then obtained in the spectrometric determination of iodide.