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Matrix Isolation Microsampling Procedures in Quantitative Fourier Transform Infrared Spectrometry

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Techniques for microsampling in infrared spectroscopy by matrix isolation are described. In the matrix isolation of liquid or solid compounds, the sample is vaporized and then diluted with a large excess of a matrix gas; the resulting gaseous mixture is deposited on a cold surface for spectroscopic examination as a solid. Detailed descriptions of the apparatus and procedures employed in the preparation of matrix-isolated samples for qualitative and quantitative analyses by Fourier transform infrared spectrometry are presented. Systems for "microsampling" (detection limits for specific compounds ~0.5 to 1 μg) and "ultramicrosampling" (detection limits ~50 to 100 ng) matrix isolation spectroscopy are described. Detection limits and Beer's law behavior for polycyclic aromatic hydrocarbons microsampled by matrix isolation are discussed. The advantages of matrix isolation as a technique for qualitative and quantitative infrared analysis of microsamples are itemized.

Keywords: Infrared; Methods, analytical; Techniques, spectroscopic

Document Type: Research Article


Affiliations: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916

Publication date: September 1, 1979

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