Preparation of ultrapure KBr pellet: New method for FTIR quantitative analysis

Fourier Transform Infrared Spectroscopy (FTIR) is a widely used technique in the analysis of commercial products. The aim of this study is to analyse the critical issues encountered preparing the KBr pellet for quantitative analyses. In order to achieve this target we analysed bulk samples for more than ten years. Thanks to this deep experience it was possible to obtain a simple and standardized method for preparation of ultrapure KBr pellet. Often the analytical error is due to an inexperienced operator who has not carefully studied the main parameters involved. The photos in this work show some examples of pellets with perfect homogeneity, transparency and good distribution: an excellent analytical result. Poor sample preparation can lead to avoidable errors in interpretation of the resultant spectrum. A little care can avoid the need for repetitious sample preparation or embarrassing errors in results. Therefore it is necessary to have an experienced operator to use this analytical method.