Coulometric Karl Fischer titration is the ideal method to determine low moisture and water contents in samples (0.001 to 1% water content). Our range of coulometers covers any requirements and can be combined with the KF oven method for difficult samples.
- Accurate and reliable determination of trace-level water contents in the range of 0.001 to 1 %
- Various coulometer versions available, e.g., stand-alone or computer-controlled
- Difficult samples can easily be analyzed with the oven method
- Compliance with FDA Regulation 21 CFR Part 11 and EudraLex, Volume 4, Annex 11
A variety of coulometers
Metrohm offers various coulometers to meet your requirements. Contact us to learn more about our coulometers.
| Coulometer | Features |
|---|---|
| Titrando coulometers |
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| Ti-Touch coulometer |
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| Eco Coulometer |
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Sample preparation and automation for coulometric KF titration
For difficult samples, e.g., solid samples or samples that do not readily dissolve, you may apply the KF oven method. In this method, the sample is heated in an oven until the water is released, and the water vapor is transferred to the titration vessel for measurement.
We offer both manual ovens and automated sample changers with integrated ovens for increased sample throughput.
Why coulometric KF titration for water content determination?
A series of standards recommend coulometric Karl Fischer titration for water content determination:
| Standard | Name |
|---|---|
| ASTM D890 | Standard Test Method for Water in Liquid Pine Chemicals |
| ASTM D1123 | Standard Test Method for Water in Engine Coolant Concentrate by the KF Reagent Method |
| ASTM D1533 | Standard Test Method for Water in Insulating Liquids by Coulometric KF Titration |
| ASTM D3401 | Standard Test Methods for Water in Halogenated Organic Solvents and Their Mixtures |
| ASTM D4928 | Standard Test Method for Water in Crude Oils by Coulometric Karl Fischer Titration |
| ASTM D5460 | Standard Test Method for Rubber Compounding Materials - Water in Rubber Additives |
| ASTM D6304 | Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric KF Titration |
| ASTM D7923 | Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer Titration |
| ASTM E1064 | Standard Test Method for Water in Organic Liquids by Coulometric Karl Fischer Titratio |
| DIN EN ISO 12937 | Petroleum products - Determination of water - Coulometric KF titration method |
| ISO 10337 | Crude Petroleum - Determination of water - Coulometric KF titration method |
| UOP 481-10 | Water in Liquid Hydrocarbons, and Heavy Hydrocarbons by Vaporizer, using Coulometric Titration |
| USP | <921> Method 1c |
| EP | 2.5.32 Water: Micro Determination |