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Karl Fischer (KF) Titrator
A Karl Fischer Titrator is an automated laboratory instrument used for precise, quantitative determination of trace water content in solids, liquids, or gases. It is highly specific to water and widely used in pharmaceuticals, petrochemicals, food, and chemical quality control.
Chemical Description / Reagents:
- Iodine (I₂): Oxidizing agent that reacts with water.
- Sulfur Dioxide (SO₂): Reducing agent participating in the reaction.
- Base: Typically imidazole or pyridine to neutralize the acid formed.
- Solvent: Methanol, ethanol, or pyridine-free mixtures to dissolve reagents and sample.
Chemical Reaction Formula:
The titration reaction consumes water in a 1:1 molar ratio with iodine:
H₂O + I₂ + SO₂ + 3 Base → 2[Base·HI] + [Base·SO₃]
Use / Applications:
- Determines both free and bound water (including crystal water).
- Volumetric Titration: Suitable for higher water content (0.1% – 100%).
- Coulometric Titration: Suitable for trace water (1 ppm – 5%).
- Industries: Pharmaceuticals, petrochemicals, oils, paints, plastics, and food products like honey.
Key Features:
- High specificity to water with accuracy errors typically <1%.
- Double platinum electrode detects endpoint via excess iodine.
- Methods include Volumetric (titrant addition) and Coulometric (electrolytically generated iodine).
- Automated systems reduce operator error and increase reproducibility.
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