Abstract
Abstract A coulometric method is described for measuring alien halide content (usually bromide and chloride) of iodine crystals at levels less than 50 ppm. Our method replaces the vintage visual turbidimetric (Nessler tubes) measurement of the USP and ACS methods with an accurate, precise electronic end point of a chloridometer. The limit of detection is about 1 ng chloride, with an uncertainty of about 3%. Our procedure avoids the inherent errors associated with visual comparison between sample, blank, and control systems with widely differing indifferent ion populations.
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