Methods for making iodine-free Karl Fischer reagents

Details Methods for making iodine-free Karl Fischer reagents Methods for making iodine-free Karl Fischer reagents

1994-06-21

1995-09-26

Warden, Robert J.

Chemistry: analytical and immunological testing

Composition for standardization, calibration, simulation,...

436 39, 436 42, 422 61, 2524081, G01N 3300, G01N 3318

Patent

active

054533775

ABSTRACT:
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 SO.sub.2, 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 SO.sub.2 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/SO.sub.2 ratio prior to obtaining a final solution having the final amine/SO.sub.2 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.

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patent: 5389545 (1995-02-01), Dahms

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