Sample preparation is an important component of IR spectroscopy. Compare the fol

Question

Sample preparation is an important component of IR spectroscopy. Compare the following methods of sample preparation and explain which would be most appropriate for the characterisation of a solid sample. Solid disc - The sample is pressed into a disc with sodium bromide (NaBr). Nujol mull - The sample is ground up and dispersed in a mull of Nujol, which is spread between sodium bromide (NaBr) plates. Solution - The sample is dissolved in chloroform (CHCl_3) and the solution is introduced into a sodium bromide (NaBr) cell.

Explanation / Answer

For solid samples, Solid disc is the best method.

The sample is pressed into a disc with sodium bromide, NaBr (or potassium bromide, KBr).

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