Sealed vials containing improved Karl Fischer solutions, and pro

Details Sealed vials containing improved Karl Fischer solutions, and pro Sealed vials containing improved Karl Fischer solutions, and pro

1991-05-30

1993-01-12

Hill, Jr., Robert J.

Chemistry: analytical and immunological testing

Determination of water

By use of a karl fischer reagent

422 58, 422 61, 422102, 436165, G01N 2178, G01N 3318

Patent

active

051790246

ABSTRACT:
An improved K.F. solution for colorimetric analysis to determine the water content of an unknown sample, and an improved sealed vial or ampule containing this solution and a process for determining water content using this solution and the sealed vial. The ampule is designed so that it can be broken into discrete parts, where an air-tight seal is maintained by the presence of an elastic band located in the area where the vial is broken. A syringe needle is used to pierce the elastic band to inject a precisely controlled amount of unknown sample into the vial. The K.F. solution is optimally comprised of a reducing ion such as SO.sub.2, a buffer including imidazole or its derivatives, iodine, iodide, and a solvent which can include a halogenated hydrocarbon.

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