By SM 4500-I
Iodide is found in natural waters at concentrations ranging from 40 μg/L in coastal surface seawater to <1 μg/L in deep ocean water and fresh water. Higher concentrations may be found in brines, certain industrial wastes, and waters treated with iodine. Iodide is thermodynamically unstable relative to iodate in oxygenated waters.
The leuco crystal violet method (4500-IB) is applicable to iodide concentrations of 50 to 6000 μg/L. The catalytic reduction method (4500-IC) is applicable to iodide concentrations of 80 μg/L or less. The voltammetric method (4500-ID) is the most sensitive method. It can be used for samples with iodide concentrations of 0.13 to 10.2 μg/L. It is also species-specific. It is insensitive to iodate, iodine, and most organic iodine compounds. It requires minimal sample manipulation, aside from an occasional dilution for samples with high concentrations of iodide. Thus, the concentrations of iodide in many types of water samples may be determined directly with the voltammetric method.
-Standard Methods for the Examination of Water and Wastewater
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