The Determination of α-Keto Acids and Oxalic Acid in Rain, Fog and Mist by HPLC

Spencer Steinberg Institute of Geophysics and Planetary Physics and Department of Earth and Space Science, University of California, Los Angeles, California, 90024, U.S.A.

Kimitaka Kawamura Institute of Geophysics and Planetary Physics and Department of Earth and Space Science, University of California, Los Angeles, California, 90024, U.S.A.

Isaac R. Kaplan Institute of Geophysics and Planetary Physics and Department of Earth and Space Science, University of California, Los Angeles, California, 90024, U.S.A.

Abstract

A simple single-step procedure for the determination of α-ketoacids and oxalic acid in rain, fog and mist is reported. The method is based upon the reversed-phase liquid chromatography of the quinoxilinol derivative of the α-ketoacids and the hydroxy-quinoxilinol of oxalic acid. This procedure is sensitive at the submicromolar level and measurements are reproducible to better than ± 10%. Oxalic acid, glyoxylic acid and pyruvic acid concentrations in fog, mist, and rain samples, collected in the Los Angeles area have been determined by the methods described in this study.

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The Determination of α-Keto Acids and Oxalic Acid in Rain, Fog and Mist by HPLC

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