Abstract
A rapid and accurate method for the determination of chlorine in organic compounds has been developed. The sample is decomposed by a simplified Schöniger oxygen flask combustion and the liberated chloride ion is determined by coulometric titration with electrolytically generated silver ion. The mean deviation on samples containing 22.45 and 12.81% chlorine was ±0.085 and ±0.060%, respectively. The method requires 3–5 mg. of sample and may be applied to smaller samples, when necessary, by decreasing the generation current. The procedure is rapid: an analyst can complete 20–25 samples a day with ease. Several methods of equivalence point detection are critically evaluated. Amperometric detection proved unreliable, while potentiometric detection using a calomel reference electrode and a silver-indicating electrode proved to be the most satisfactory.
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