This application note thoroughly investigates the stability of a one-component Karl Fischer (KF) reagent. Results show a mild average decrease in titrant concentration over a long period.
KF titration is a straightforward technique to selectively determine the amount of water present in a sample.
One-Component vs. Two-Component KF Reagent
Two different types of KF reagents are used in the laboratory:
- One-component titrant — contains all necessary substances (iodine, sulfur dioxide, and a base) dissolved in an alcohol solution (methanol)
- Two-component titrant — consists of a methanolic solution of iodine and a base and a solvent composed of a methanolic solution of sulfur dioxide
Stability of One-Component KF Reagent
KF titration occurs in a solution consisting of an alcohol, sulfur dioxide, and a base. Since one-component titrant contains all reaction components for a KF titration, air humidity entering the titrator triggers the start of the reaction. This leads to a slow and continuous decrease in the titrant concentration when the bottle is opened and connected to the instrument.
What Is in This Application Note?
In this application, a detailed investigation of the decrease in the concentration of one-component KF reagent is monitored over a long time period (a few weeks) to quantify the change in titrant concentration as a function of time. Moreover, the suitability of KF titrant with decreased concentration is subsequently verified with a liquid standard. Download our free application note to learn more.
This Application Note Includes
- An introduction to the method
- Sample preparation and procedures
- Solutions and chemicals
- Chemistry
- Instruments and accessories
- Results and remarks
Method files (.lmt and .xml) are also included for direct import and implementation of the instrument.
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