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Karl Fischer-titrering

Karl Fischer-titrering

Kompletta lösningar för volymetrisk och coulometrisk vattenhaltsbestämning med Karl Fischer-titrering: Titratorer, tillbehör och kunskap från världens ledande leverantör.

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Whatever your requirements – we have the right Karl Fischer titrator for you

Our portfolio of Karl Fischer titrators includes compact all-in-one options for routine moisture determination as well as fully automated Karl Fischer systems for volumetric and coulometric Karl Fischer titration of water contents from 0.001 to 100%. Use the filters to refine your search and find the perfect Karl Fischer titrator for you. Are you looking for potentiometric titrators?  Go to our potentiometric titrators

Hitta applikationer för Karl Fischer-titrering

Reliable and accurate measurements – Components for your KF titrator

Why Metrohm Karl Fischer titrators? – A long history of success

Karl Fischer titration is the preferred method for water content determination in pharmacopeias and countless norms, e.g. ASTM or DIN. Metrohm has been offering reliable solutions for Karl Fischer titration for more than 70 years. Ever since, the instruments have been continuously improved to meet the needs of the users.

  • Get the complete range from compact benchtop solutions to modular automated systems including accessories and software for volumetric and coulometric Karl Fischer titration from one supplier.
  • Rely on Swiss-made quality.
  • Benefit from our global presence in over 80 countries for local support by our service and application experts.

Learn more about KF titration in more than 100 application notes written by our application specialists:

Go to Application Finder

In addition to Karl Fischer titrators, Metrohm also offers a wide range of potentiometric titrators and a robust solution for process analysis.

Potentiometric titrators from Metrohm

Titration process analyzer from Metrohm

Karl Fischer titrator – FAQs

Karl Fischer (KF) titrators are used for measuring both free and bound water content. With the KF method, you can, for instance, determine the surface water on crystals as well as the water contained within the crystals.

  • KF titrators can be used for moisture determination (i.e., water content determination) in all sample types: liquids, solids, slurries, and gases​
  • KF titrators are applied over a wide concentration range from ppm up to 100%​
  • KF titrators are fast and highly selective​
  • KF titrators supply reproducible and correct results​

A Karl Fischer (KF) titrator determines water content in samples using a specific chemical reaction. The process is based on two redox reactions involving classical alcohol-based Karl Fischer reagents. Methanol and sulfur dioxide form an alkyl sulfurous acid, which, in the presence of water and iodine, is oxidized in a water-consuming reaction. The reaction stops when all the water is consumed, and a small excess of iodine signals the endpoint of the titration

Manual or fully automated Karl Fischer instruments are available. Metrohm offers various solutions:​

  • The OMNIS KF titrator can be extended by an OMNIS Sample Robot to perform up to four fully automated titrations at the same time with automated sample changing for non-stop titration: Go to automation options for OMNIS KF titrators​ ​
  • The KF Titrando and the KF Ti-Touch offer the option to add automated thermal sample preparation for samples that cannot be titrated directly: Go to automation options for KF Titrando or KF Ti-Touch​

 

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When selecting a KF titrator, consider:

  • Water content range: Use coulometry for trace levels (ppm) and volumetry for higher concentrations.

  • Sample type: Liquids, solids, or gases may require different accessories (e.g., oven method for solids).

  • Throughput: For high sample volumes, automation (e.g., OMNIS Sample Robot) boosts efficiency.

  • Compliance needs: Ensure the system supports GMP/GLP, 21 CFR Part 11, and pharmacopeia standards.

  • Modularity: Metrohm’s OMNIS platform grows with your lab – start small and expand as needed.

Our Karl Fischer experts are happy to assist you with your questions:

Contact us

Metrohm is present in over 80 countries to ensure local training and support.

Metrohm offers:

  • On-site installation and training

  • Application support from our global network of experts

  • Webinars, tutorials, and documentation

The table below compares volumetric KF titration (volumetry) to coulometric KF titration (coulometry).

  Volumetric KF titration  Coulometric KF titration
Moisture 0,1% to 100% 0,001% to 1%
Sample addition

solid or pasty samples can be added directly into the titration vessel (opening a volumetric titration cell for a short period of time does not falsify the results)

liquid samples are added with syringe through a septum

liquids or gases are added with syringe through a septum: to avoid ambient humidity to enter the titration cell, never open a coulometric cell
Titer determination  regularly not necessary
lodine addition/generation iodine-containing titrant is added via buret produced by a generator electrode by anodic oxidation

 

Learn more in our blog article:

Blog: Karl Fischer titration – When to use volumetry or coulometry

To carry out volumetric titrations, you need a KF titrator with a completely equipped titration vessel, indicator electrode, dosing unit, and suitable reagents for volumetric KF titration.

For coulometric titrations, you need a coulometer, with a completely equipped titration cell, indicator electrode, a generator electrode with or without diaphragm, and a reagent suitable for coulometric KF titrations.

Low levels of water in the range of 0.001% up to 1% are analyzed best with a Coulometer.

Depending on the water content, you need to select the appropriate generator electrode. The generator electrode without diaphragm combines easy handling with reliable results. For the determination of trace level water contents, we recommend using the generator electrode with diaphragm.​

Metrohm offers various Coulometers, from basic stand-alone versions to high-end computer-controlled coulometric systems with automation and sample preparation options:

Go to coulometric Karl Fischer titrators

Trace levels of water in solvents and oils are analyzed best with a Coulometer.

Depending on the water content and which KF reagent you use, you have to select the appropriate generator electrode. With the generator electrode without diaphragm, only one reagent is required. The generator electrode with diaphragm is recommended for the determination of very low water contents and when using KF reagents containing solubilizers (e.g., chloroform).​

Metrohm offers various Coulometers:

Go to coulometric Karl Fischer titrators

There is no general answer to this question. The optimal KF method depends on the water content of the sample and not on the sample size.

Read our blog article to learn more about this topic:

Blog: Karl Fischer titration – When to use volumetry or coulometry

Low levels of water are analyzed best with a Coulometer. The coulometric method is very sensitive. Therefore, we do not recommend opening the titration cell to add a solid sample. Atmospheric moisture would falsify the results.

The oven method is the optimal solution for solids with low water content. Learn more about the oven method in our blog and application bulletin:

Blog: Oven method for sample preparation in Karl Fischer titration

Application Bulletin: Automatic Karl Fischer water content determination with the 874 Oven Sample Processor

Watch the following video to see the OMNIS Coulometer and OMNIS Sample Robot Oven in action.

Yes, it is possible to perform volumetric and coulometric Karl Fischer Titration  with one instrument.

The 852 Titrando offers the option to perform volumetric and coulometric KF titrations.

Explore the additional benefits of the KF Titrando product family:

See KF Titrando

The OMNIS Titrator or the OMNIS Coulometer can be upgraded with an OMNIS Coulometer Module or an OMNIS Dosing Module to allow volumetric and coulometric titrations with the same titration system.

Learn more about the modularity of the OMNIS platform:

See OMNIS platform

Yes, potentiometric and Karl Fischer (volumetric and coulometric) titrations can both be run on an OMNIS titrator. OMNIS titrators offer unparalleled modularity and allow adding functionality at any time. Additional titration modes can be combined and added whenever needed.

This modularity is unique to Metrohm's OMNIS platform, allowing laboratories to adjust quickly. Learn more about the modularity of OMNIS:

See OMNIS titrators

Yes, the OMNIS Coulometer allows coulometric bromine index determinations according to ASTM D1492-08.

See OMNIS Coulometer

Do you want to learn more about KF titration?

Download your free copy here

The free monograph "Water determination by Karl Fischer titration" covers the theoretical aspects such as, reagents, chemical reactions, volumetry and coulometry, detection methods, and side reactions. It then presents water determination in different matrices, such as cosmetics, petrochemical products, plastics, and more.