Abstract
A specific DMPO-OH adduct signal (1:2:2:1)related to hydroxyl radical generation in a longterm stored improved iodide formulation, tentatively designated as the distilled KMT reagent which prepared from a pH 0.3 solution containing FeCl3, EDTA, KI and ethanol termed the KMT reagent, was detected by electron spin resonance (ESR) spectroscopy.Although the color intensities of N,N,N,N-tetramethyl-p-phenylenediamine (TMPD) and N,N-diethyl-p-phenylenediamine (DPD) differ, the mixture of the long-term stored distilled KMT reagent and TMPD exhibited a purple color similar to Wurster's blue, and the mixture of the long-term stored distilled KMT reagent and DPD exhibited a pink color similar to Wurster's red. There is a possibility that the long-term stored distilled KMT reagent may possess with the ability to generate a hydroxyl radical.
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