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Karl Fischer Ovens® You are here: Metrohm USA >> Products >> Titration >> Karl Fischer >> Karl Fischer Ovens >> 885 Compact Oven Sample Changer
The KF oven method Substances that release their water slowly or at high temperatures (e.g., plastics or inorganic salts) are not suitable for a direct Karl Fischer titration. Other samples have a low solubility in alcohols, which may involve toxic solvents to promote dissolution and/or involve extensive sample preparation. Introducing these samples directly into the titration cell may contaminate it, and thus require you to exchange the titration solution and clean the cell frequently. There are still other substances that undergo side reactions with the KF reagents (e.g., ascorbic acid), which lead to false results. All of these problems can be avoided by using the KF oven method: the sample is heated in an oven and a carrier gas transfers the released water to the titration cell, where it is then determined by Karl Fischer titration. Since only the water enters the KF cell and the sample itself does not come into contact with the KF reagent, unwanted side reactions and matrix effects are eliminated. Sophisticated construction Instead of introducing the sample into the oven by means of a sample boat, it is weighed directly into a small sample vial, sealed with a septum cap and transferred to the oven. This brings decisive advantages:
Choose the 860 KF Thermoprep for manual, individual samples or the 874 KF Oven Sample Processor for automating multiple samples. Both are very compact in size and feature integrated heating block, gas pump, flow meter and drying flasks. Common applications:
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