Abstract
The procedures described utilize the Schöniger combustion technique for the initial decomposition of a wide variety of boron compounds. Any strong acids formed during the combustion are pretitrated coulometrically in a medium containing 25 to 30% methanol and sodium nitrate as supporting electrolyte. Pelletized mannitol is added after pretitration, and the system is retitrated for boric acid. Potentially interfering acids were studied in the presence of boric acid and found to show negligible effects. Usual sample sizes ranged from 2 to 7 mg. A single determination requires 20 to 25 min.
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