PYRIDINE-FREE KARL FISCHER REAGENT USEFUL IN DETERMINING WATER

摘要

ABSTRACT OF THE DISCLOSUREAn essentially pyridine-free Karl Fischer reagent useful in thedetermination of water is provided herein. It comprises a dissolving agentcontaining sulfur dioxide and a pyridine substitute in a Karl Fischer solvent,and a titrating agent containing iodine in a Karl Fischer solvent. Thepyridine substitute is an alkali metal benzoate, an alkaline earth metalbenzoate or ammonia, and the reagent is essentially free of pyridine. Thesepyridine substitutes have a very good solubility in the reagent solution,react with alcohols virtually without the formation of esters, and have avery high stability in storage.