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
  • High-end coulometer for all your needs
  • Software control or via touch-control unit
  • Regulatory compliance (e.g., 21 CFR Part 11)
  • Automation and sample preparation options
  • Automatic sample injection and titration start recognition
Ti-Touch coulometer
  • Compact and stand-alone coulometer
  • All components integrated in one housing
  • Touch-screen operation, precise results, and safe handling
  • Regulatory compliance (21 CFR Part 11)
Titrino plus coulometer
  • Space-saving coulometer
  • Optional Power Box for mobile use

Sample preparation and automation for coulometric KF titration

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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.

More on sample preparation for KF titration

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
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