Abstract
Several methods are reported for the determination of iodine, but none of them is suitable for the analysis of stack gas, and a sampling method and the condition of analysis using iodide selective electrode were examined. Iodine in sample gas was absorbed in 0.1 N NaOH solution and stabilized as iodate by the addition of 1.5 N NaClO solution. The iodate was analyzed by the iodide electrode after reduction to iodide with hydrazine sulfate. A plot of mV vs log concentration gave a straight line, having a slope of -60.6±1.8 mV. Interference by other ions, e.g., bromide, sulfite, and ammonium chloride, was negligible. This method is very simple and is recommended for the determination of iodine in stack gases, in routine work.
