Learn to determine water content in rooibos tea using volumetric KF titration. This application note details the external extraction process and shows how the EVA V3 titrator is used for precise results.
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How does the external extraction method work?
The external extraction method involves transferring the water content from a solid sample into a solvent outside the titration cell. This step ensures the KF titrator remains free to perform other measurements. Once the water is extracted, the solution is injected into the KF cell for accurate titration.
Why is methanol dry used as the extraction solvent?
Methanol dry is an effective solvent for extracting water from insoluble samples like rooibos tea due to its ability to readily absorb water. Its low initial water content ensures high precision in measurements.
What are some common sources of error in KF Titration, and how can they be minimized?
Common sources of error include improper calibration, contamination of reagents, incorrect sample preparation, and incomplete extraction of water. These can be minimized by following standardized procedures, calibrating regularly, and maintaining clean and dry equipment.
