Determination of Gaseous Formic Acid and Acetic Acid by Pulsed Ultraviolet Photoacoustic Spectroscopy

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Abstract:

The quantitative determination of gaseous formic acid and acetic acid by photoacoustic spectroscopy (PAS) using pulsed laser excitation in the ultraviolet is reported. Instrumentation utilizing continuously tunable laser excitation in the 220-nm wavelength region is used to record time-resolved PA signals from samples of each acid. Detection limits of 140 ppbv for formic acid and 120 ppbv for acetic acid in dry nitrogen at one atmosphere total pressure are attained. Considerable background signal originating from atmospheric oxygen is found to impose limitations on the detection sensitivity with air samples.

Keywords: Analytical methods; Organic acids; Photoacoustic spectroscopy; Spectroscopic techniques; Trace gas detection

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702884429021

Affiliations: 1: Department of Chemistry and Optical Sciences Center, University of Arizona, Tucson, Arizona 85721; permanent address: Institute of Physics, P.O. Box 57, 11001 Belgrade, Yugoslavia 2: Department of Chemistry and Optical Sciences Center, University of Arizona, Tucson, Arizona 85721

Publication date: July 1, 1988

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