The application of matrix isolation Fourier transform infrared spectroscopy to qualitative and quantitative analysis of polycyclic aromatic hydrocarbons (PAH) Is described. Samples in nitrogen matrices at ~15 K are produced by mixing the PAH vapors effusing from a Knudsen cell with a large excess of nitrogen gas. From the results obtained with nearly 20 PAH,

The matrix isolation (MI) Fourier transform Infrared and

Journal of Liquid ChromatographyPublication details, including instructions for authors and subscription information:ABSTRACT Capillary electrophoresis is used as a screening protocol for the determination of uranyl ion complexed with Arsenazo Ill. Long sample plugs are injected and stacked to narrow zones. Capillary column inner diameter, running buffer constituents and concentrations, effective column length and injected sample plug length are optimized and discussed. A limit of detection of 10 ppb is achieved with a linear dynamic range of nearly 3 orders of magnitude in concentration injected. Analytical figures of merit are presented and river water samples are analyzed. 3699

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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.