Applications of the DuraSampIIR employing a KRS-5 focusing element

Introduction

The effectiveness of the DuraSamplIR as a single reflection ATR system has been described a number of times. In the systems described so far, the focusing element beneath the diamond prism was made of ZnSe. However, on this occasion, the DuraDisk : which uses a focusing element made of KRS-5 instead of ZnSe - makes its appearance. The infrared light transmission wavenumber region is much wider when the KRS-5 focusing element is used. Whereas the wavenumber range was limited to about 4000cm^-1 to 600cm^-1 with the former, the latter enables measurement from 4000cm^-1 down to 400cm^-1. As a result, by harnessing the usual performance of the DuraSamplIR, the measurement range can be further extended to 400cm^-1 by employing the KRS-5 DuraDisk. In practical terms, it is effective in confirmatory tests complying with the Japanese Pharmacopoeia where the wavenumber range is set from 4000cm^-1 to 400cm^-1. and for identifying substances in which absorption can be confirmed between 600cm^-1 and 400cm^-1. Examples of these measurements are introduced below.

October 21, 2002 GMT