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Check our white paper to know the most recommended standard for determining the concentration of titrant in volumetric karl fischer titration. |
In volumetric Karl Fischer titration, it is important to know the exact concentration of the titrant, which should be checked regularly.
Why is knowing titrant concentration important?
The water content in a sample is determined by measuring how much titrant is added, based on a direct reaction between iodine and water. For accurate results, it's crucial to know the iodine concentration precisely. However, this concentration can decrease over time because iodine reacts with moisture in the air. Therefore, it’s recommended to check the concentration daily before testing samples. This is done by titrating a substance with a known amount of water and calculating the titrant concentration based on how much was used.
How do standards impact measurement reliability in KF titration?
Not all standards are good for determining concentration with a volumetric KF titrator. For example, water standards of 0.1 mg/g or 1 mg/g work well with coulometric instruments, but they are too low for reliable results with volumetric devices. If you’re using pure water, it’s best to titrate around 10 mg of water for each sample when working with a 5 mL burette and a titrant concentration of 5 mg/mL.
This approach ensures more accurate measurements and reliable results in your titration process.
