D4928 Archives - Ayalytical

Aqua 40 Vario Head Space Module [Not Available]

Juan Ayala — Tue, 02 Jan 2024 14:35:10 +0000

The combination of the Karl-Fischer-Titrator AQUA 40.00 and the headspace technique offers a wide range of interesting applications to determine moisture in solid and pasty samples, oils and viscous compounds.

It does not require time-consuming sample preparation: Weigh the sample in a headspace vial, close and seal the vial, and then administer it into the AQUA 40.00 headspace oven.

The analysis procedure starts with heating up the sample up to a temperature set prior. A carrier gas transports the moisture from the sample into the measuring cell where the moisture is titrated.

With the unique advantage of the system using the closed-loop-carrier gas circulation, any additional gas drying is no longer necessary. Hence, the carrier gas is continually titrated to dryness within the closed loop.

The total dryness of the gas enhances the moisture liberation, and sensitive samples can be heated out very gently. Moisture liberation becomes possible even at ambient temperature.

All these advantages result in reducing reagent consumption considerably. Furthermore, temperature-programmed heating procedure can be defined individually by the user. Such a temperature program reveals in which way the moisture in question is bonded to the sample substance. You can distinguish between chemically bonded water of crystallization and adsorbed surface water.

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Aqua 40 Solid Module[Not Available]

Juan Ayala — Tue, 02 Jan 2024 14:35:09 +0000

The gas extraction is the ideal method to detect moisture in solid and pasty substances. For this analysis, the Solid Module is combined with the Basic Module of AQUA 40.00.
The measurement of trace amounts of water is realized by the special designed heating chamber for solid and pasty samples. The sample has no contact with the reagent. Therefore the consumption of reagent is low.
The sample is applied into a sample container. So it is possible to analyse small sample amounts (down to 1 mg). The sample container is heated out in the solid chamber with temperature program or isothermal heating depending on the consistency of sample. The measurement of water content is based upon the titration according to Karl Fischer. After analysis, the used sample container is ejected from the heating chamber into collecting vessel. With closed-loop carrier gas circulation, any additional gas drying is no longer necessary: the carrier gas is continually titrated to dryness within the closed loop. The total dryness of the gas enhances the moisture desorption from the sample. Moreover, sensitive samples can be heated out very gently. Degradation’s and side reactions are eliminated. Heating with temperature program, you can distinguish between various types of bonded water.

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