| 摘要 |
PURPOSE:To improve reproducibility by consisting an electrolyte of iodine or iodide, sulfur dioxide, amine, alcohol and chloroform and specifying the amine and alcohol. CONSTITUTION:This electrolyte for Karl Fischer coulometric titration consists of the iodine or iodide, sulfur dioxide, amine, alcohol and chloroform, in which the amine is a pyridine deriv., imodazole or imidazole deriv. and the alcohol is a mixture composed of polyhydric alcohol or the ether compd. thererof and methanol. The amt. of the amine to be used in the electrolyte is preferably in a 5-20wt% range and the amt. of the polyhydric alcohol to be used is preferably in a 3-30vol% range of usually >=95% said alcohol in the electrolyte 3, more preferably in a 5-20vol% range. The mixing ratio of the polyhydric alcohol or the ether compd. thereof and methanol is preferably in a 1:1-8 range.
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