Stable water standard
AssigneeMerck Patent GmbH
InventorsSilke Gruenke, Stefanie Bauer
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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).
Claims6
Use of a mixture consisting of at least one stable water-containing compound and at least one stable water-free compound as water standard for the determination of water.
Standard for the determination of water, consisting of at least one stable water-containing compound and at least one stable water-free compound, where the constituents have particle sizes of less than 300 μm.
Process for the preparation of a water standard, comprising the following steps:
- a) provision of at least one stable water-containing compound and at least one stable water-free compound;
- b) reduction of the particle size of the constituents mentioned in a) to less than 300 μm;
- c) calculation of the proportions of the stable water-containing compound(s) and of the stable water-free compound(s) in order that the water content desired for the standard arises in the mixture;
- d) mixing of the constituents obtained from step b) in accordance with the proportions calculated in step c),
- where the sequence of steps b) and c) can be exchanged.
Dependencies are inferred from the claim text.