Making a KBr disc is a crucial step in infrared spectroscopy.
This process ensures that your samples are analyzed accurately and efficiently.
Here’s a detailed guide to help you through the process.
How to Make a KBr Disc: 4 Simple Steps for Clear Spectral Readings
1. Preparation of KBr Mixture
Start by mixing KBr powder with your sample.
The typical ratio is 1 part sample to 100 parts KBr.
Blend the mixture well, either using a mortar and pestle or a grinding mill.
Avoid over-grinding to prevent moisture absorption.
The amount of KBr needed depends on the disc size.
For a ½ inch (12.7 mm) diameter disc, about 200-250 mg of KBr is sufficient.
2. Use of Pellet Press
Place the pellet press die sleeve onto the base plate.
Add the mixed KBr and sample to the die sleeve.
Place the plunger on top.
Ensure all components (anvils, die set, and powder) are at the same temperature.
Heating the anvils and die set before use helps maintain a dry environment.
3. Compression
Compress the mixture using a hydraulic press.
Uniform force will produce a solid, transparent pellet.
The clarity of the disc depends on the quantity and type of sample used.
For a 13mm diameter die, using 200-300 mg of KBr and 1 mg of sample with a load of 8 tons is a good starting point.
4. Post-Preparation Care
After making the KBr disc, clean the equipment thoroughly.
This prevents contamination of future samples.
Clean the anvils and die set with appropriate solvents.
Polish the surfaces to ensure clarity and absence of scratches.
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