Indirect AAS Determination of Iodide at the 10-7mol l-1 Level by Distillation of Iodine Followed by Its Reaction with Arsenic(III).

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A new indirect method for the determination of iodide at the 10-7mol l-1 level based on the reaction of distilled I2 with As(III) followed by the determination of the excess As(III) with hydride generation AAS is proposed. Iodide is oxidized to iodine by Ce(IV), distilled with a nitrogen carrier gas and absorbed in a KI solution. Absorbed iodine reacts quantitatively with excess As(III) in a slightly alkaline solution at 80-90°C. After the reaction iodide in the solution is removed as an AgI precipitate. The amount of distilled iodine can be determined indirectly by measuring the atomic absorbance of As by a hydride-generation technique. The calibration curve is linear over the range from 2.5×10-8 mol l-1 to 2×10-7mol l-1, and the relative standard deviation is 2.9% (n=7) for 1×10-7mol l-1 iodide.
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