Abstract
An analytical method for the determination of Iodate and iodide ions at the μg 1−1 level in mixtures was investigated. Iodide in samples was first oxidized with sodium nitrite; the free iodine liberated was then released from the solution by heating. Excess nitrite was destroyed with amidosulfuric acid (sulfamic acid). The iodate remaining in the solution was determined by a kinetic-photometric method based on the catalytic effect of iodine on the oxidation of chlorpromazine by hydrogen peroxide in a sulfuric acid solution. The total iodine was also determined by a similar analytical procedure without carrying out operations for the removal of iodide; the iodide was found from the difference between the two results. Mixtures of iodate and iodide in the 0.2–5 μg 1−1 range of total iodine could be determined within an error of 10%. The proposed method has been successfully applied to a differential determination of iodate and iodide in natural fresh-water samples.
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