| 摘要 |
Various methods are described for producing volumetric one-component iodine-free Karl Fischer reagents useful for determining the water content of a sample, the reagents containing triiodide as the dominant oxidizing species. The reagents contain a reducing agent such as SO2, a buffer such as amine, a solvent, and an oxidizing agent that is triiodide, generally in the form of triiodide ions. The molar amount of SO2 in these reagents is greater than the molar amount of triiodide. The characteristics of these methods generally include the formation of triiodide in a first solution having a first amine/SO2 ratio prior to obtaining a final solution having the final amine/SO2 ratio. These methods provide economies in the ingredients used, and yield reagents exhibiting good liter strength and enhanced reproducibility of properties from one production run to the next. |
