Attenuated total reflectance powder cell for infrared analysis of hygroscopic samples |
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Authors: | Lekgoathi M D S le Roux J P |
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Affiliation: | Department of Applied Chemistry, The South African Nuclear Energy Corporation Ltd., P.O. Box 582, Pretoria 0001, South Africa |
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Abstract: | An attenuated total reflectance (ATR) sample cell has been designed, manufactured and subsequently used for the mid-infrared analysis of hygroscopic samples. This sample cell was installed as a simple drop-in replacement for the cell supplied with our commercially available Harrick Mvp-Pro FTIR–ATR accessory. Calcium chloride, a well-known desiccant that has a propensity to absorb water into its crystal lattice, was selected as non-infrared active substrate to accentuate the efficacy of the cell in preserving the anhydrous state of the sample by straightforward monitoring of the water bands. In contrast, mid-infrared spectra are presented that qualitatively demonstrate the rapid rate at which atmospheric moisture is incorporated into the anhydrous sample when analyzed using the conventional ATR cell assembly. |
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Keywords: | Infrared Hygroscopic ATR |
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