Abstract
Several sources of error have been found in SUGAWARA's method for the determination of iodine in sea water. These are minimized in the modified procedure which has been developed. Iodide is coprecipitated quantitatively with silver chloride by silver ions slowly liberated into the water by the dissolution of silver citrate. The iodide present in the precipitate is oxidized to iodate by means of bromine under the influence of ultrasonic agitation. After destruction of hypobromite, iodine is determined either by photometric titration, or by spectrophotometry. Iodate is not coprecipitated by silver chloride, but can be determined after reduction with hydrazine sulphate. The titrimetric and spectrophotometric methods give recoveries of iodide-and iodate-iodine of 99.0±0.4% and 98.5±0.6% respectively, and have coefficients of variation of ±0.4% and ±0.8%.
Published Version
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