A simple single-step procedure for the determination of #x3B1;-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 #x3B1;-ketoacids and the hydroxy-quinoxilinol of oxalic acid. This procedure is sensitive at the submicromolar level and measurements are reproducible to better than #xB1; 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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