Development of Direct Determination Method for Dicarboxylic Acids in Atmospheric Particulate Matter Collected on Filter by Using Pyrolysis/Alkylation-GC Technique.

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A method for determination of α, ω-dicarboxylic acids (succinic acid, glutaric acid, and adipic acid) in an atmospheric aerosol collected on a quartz filter has been developed by means of pyrolysis of alkylating reagent-methylation-gas chromatography (PyMe-GC) equipped with a flame ionization detector. Simultaneous pyrolysis of tetramethylammonium hydroxide (TMAH)-methylation of dicarboxylic acids was achieved at 386°C using a Curie-point pyrolyzer. Under optimized analytical conditions, conversion ratios of these diacids to the corresponding diesters were found to be 95.5-103%. The pyrolysis of alkylating reagent-methylation method with direct addition of TMAH methanol solution to the quartz filter made possible direct determination of dicarboxylic acid concentrations in an atmospheric aerosol collected on a quartz filter without any pretreatments, extraction, concentration, or derivatization. This method was applied sucessfully to the determination of C4, C5, C6 α, ω-dicarboxylic acids in the urban aerosol samples collected at Saitama University, Urawa in summer, 1993. The observed ambientconcentrations were 116-669, ca. 16-131, and ca. 7-61ng m-3 for succinic acid, glutaric acid, and adipic acid, respectively.
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