Determination of glyoxal and methylglyoxal in atmospheric particulate matter by 2,4-dinitrophenylhydrazine derivatisation |
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Authors: | Dr Susana García-Alonso Rosa Pérez-Pastor M Luisa Sevillano-Castaño |
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Institution: | 1. CIEMAT , Avda. Complutense 22, 28040 Madrid, Spain susana.garcia@ciemat.es;3. CIEMAT , Avda. Complutense 22, 28040 Madrid, Spain |
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Abstract: | A simple and rapid method has been optimised to determine glyoxal and methylglyoxal in atmospheric particulate matter by extraction and derivatisation with 2,4-dinitrophenylhydrazine solutions. Minimal sample preparation was required by mixing a portion of filter charged with atmospheric particulate matter with 5?mL of a saturated solution of 2,4-dinitrophenylhydrazine (1.6?g?L?1) in acetonitrile and acidified by H2SO4 (50?µL?L?1). Chromatographic analyses were carried out 1?h after derivatisation solution was mixed. Finally, the proposed method was applied to quantify these dicarbonyls in atmospheric particulate matter samples, which were obtained as part of a large field study to characterise atmospheric aerosol from a rural area of Madrid. Glyoxal concentrations averaged 0.24?ng?m?3, whereas mean values of methyl glyoxal were around 0.95?ng?m?3. Methyl glyoxal levels showed a clear relationship with the particulate matter levels, whereas glyoxal data did not show such a correlation. This could indicate that both dicarbonyls come from different sources. |
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Keywords: | Glyoxal methylglyoxal atmospheric particulate matter 2 4-dinitrophenylhydrazine high performance liquid chromatography |
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