南極エアロゾル中のモノおよびジカルボン酸とオキソカルボン酸

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Antarctic aerosol samples collected from Syowa Station were studied for the molecular distributions of saturated and unsaturated monocarboxylic acids, α, ω-dicarboxylic acids and oxocarboxylic acids using a capillary gas chromatography (GC) and GC/mass spectrometry (GC/MS). Distributions of normal saturated monocarboxylic acids (C8-C28 ; 3.4-8.1 ngm^<-3>) showed a maximum at C16 with an even carbon number predominance, except for C9 which was more abundant than C8 and C10. Their distribution is dominated by the lower molecular weight (C12-C19) monocarboxylic acids, suggesting that the Antarctic aerosols are mostly derived from marine organisms through sea-to-air emissions. However, unsaturated monocarboxylic acids (C16:1, C18:1; 0.40-0.91 ngm^<-3>), which are more abundant than saturated ones in marine algae, were detected at relatively low concentrations. Depletion of unsaturated acids in the aerosols can be explained by a photochemical oxidation of the acids at their double bond. This is consistent with the abundant presence of C9 α, ω-dicarboxylic acid (azelaic acid) in the Antarctic aerosols, a specific photo-oxidation product of unsaturated fatty acid where a double bond exists predominantly at C-9 position. Relative abundance of azelaic acid carbon content in total aerosol carbon content (TC) was found to be positively correlated with solar radiation. Mid-chain oxocarboxylic acids (4-oxooctanoic and 4-oxononanoic acids; 0.4-1.0 ngm^<-3>) were also detected in the Antarctic aerosols. The 4-oxocarboxylic acids are possible precursors to the production of low molecular weight diacids such as succinic acid (C4).
日本地球化学会の論文
1996-04-15

南極エアロゾル中のモノおよびジカルボン酸とオキソカルボン酸

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