When making a KBr pellet, the amount of sample required typically ranges from 0.2 to 1 percent of the total mixture by weight.
This low concentration is necessary because the pellet is thicker than a liquid film.
Higher concentrations can lead to absorption or scattering of the IR beam, resulting in noisy spectra.
For a standard ½ inch (12.7 mm) diameter pellet, about 200 to 250 mg of KBr is sufficient.
The sample amount should be adjusted according to the desired concentration within the range of 0.2 to 1 percent.
For example, if using 200 mg of KBr, the sample would be 0.4 to 2 mg.
The amount of KBr and sample should be scaled based on the area of the disk (proportional to the square of the radius/diameter) if a different size pellet is required.
Proper mixing of the sample with KBr is crucial.
This can be achieved using a mortar and pestle or a grinding mill.
Ensuring minimal moisture absorption during the process is important.
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