Transmission sampling using KBr pellets is a terrific way to analyze powders in the infrared for quantitative or qualitative purposes. It requires a small amount of sample, generally about 3 mg. The sample concentration needs to be optimized, but the general rule is between 0.5 – 3%. The full spectral range from 4000 – 400 cm-1 is available, and with the right accessories and techniques making perfect pellets is within reach. No more cloudy pellets and distorted absorbance bands due to scattering and refraction.
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