초록 ▼

The determination of water by the Karl Fischer method is carried out using a reagent containing sulfur dioxide, iodine and a base. The determination is carried out in a liquid medium in which the sample under investigation has been dissolved. The solvents used are, above all, methanol and 2-methoxye

The determination of water by the Karl Fischer method is carried out using a reagent containing sulfur dioxide, iodine and a base. The determination is carried out in a liquid medium in which the sample under investigation has been dissolved. The solvents used are, above all, methanol and 2-methoxyethanol. The presence of a further solvent which enables the reaction to take place without interference is advantageous. Solvents suitable for this purpose are lower alkanols which are substituted by halogen atoms and/or phenyl radicals. These alkanols are also employed as the solvent in Karl Fischer reagents.

대표청구항 ▼

A reagent for the determination of water by the Karl Fischer Method, comprising sulfur dioxide, a base and iodine or an iodide and a solvent containing (a) more than 10 percent by weight of a monohydric or dihydric alkanol having 1 to 3 carbon atoms, which alkanol is substituted on its carbon atoms

A reagent for the determination of water by the Karl Fischer Method, comprising sulfur dioxide, a base and iodine or an iodide and a solvent containing (a) more than 10 percent by weight of a monohydric or dihydric alkanol having 1 to 3 carbon atoms, which alkanol is substituted on its carbon atoms with 1 to 4 halogen atoms, 1 to 4 phenyl radicals or 1 to 4 substituted phenyl radicals, the halogen atoms being attached to carbon atoms free from a hydroxyl group, and (b) less than 90 percent by weight of an organic solvent selected from the group consisting of a lower aliphatic alcohol, a liquid hydrocarbon and a liquid halogenated hydrocarbon.