Stable water standard

Chemistry: analytical and immunological testing – Determination of water – By use of a karl fischer reagent

Reexamination Certificate

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C436S039000, C436S174000

Reexamination Certificate

active

07416894

ABSTRACT:
The invention relates to water standards that are producible by grounding and mixing at least one component abounding in water and one water-free or low water component each. The inventive water standards are characterized by a good storage stability. They are suitable for the calibration or the inspection of devices to determine the water content after thermal release, especially for determining the water content according to Karl Fischer in combination with a Karl Fischer oven (Karl-Fischer oven technique).

REFERENCES:
patent: 5246863 (1993-09-01), Dahms
patent: 5340541 (1994-08-01), Jackson et al.
patent: 6131442 (2000-10-01), Krause
patent: 6946298 (2005-09-01), Hoffmann et al.
patent: 7049146 (2006-05-01), Miller
patent: 7122376 (2006-10-01), Miller
patent: 2004/0171161 (2004-09-01), Miller
patent: 0482465 (1992-04-01), None
patent: 4-297869 (1992-10-01), None
patent: WO 0240991 (2002-05-01), None
Neuss J D et al: “Sodium Tartrate Dihydrate as a Primary Standard for Karl Fischer Reagent” Analytical Chemistry, American Chemical Society. Columbus, US Bd. 23, 1951, 1332-1333, XP001042005.

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