Analytical Chemistry of Four Nitrodibenzopyranone Isomers for Ambient Air Analysis
- 1 December 1992
- journal article
- research article
- Published by Taylor & Francis in International Journal of Environmental Analytical Chemistry
- Vol. 49 (4) , 207-219
- https://doi.org/10.1080/03067319208027572
Abstract
Nitrodibenzopyranones have recently been shown to be present in ambient air and to contribute substantially to the mutagenicity of ambient air particulate extracts. To allow their isomer-specific analysis in ambient samples, nitro-isomers (2-, 3- and 4-nitrodibenzopyranone and a fourth isomer tentatively identified as 8-nitrodibenzopyranone) and the parent dibenzopyranone were characterized by their 1H-NMR spectra, mass spectra and their gas chromatographic retention indices on DB-5, DB-1701 and SB-smectic stationary phases. 2-, 3 and 4-Nitrodibenzopyranone were well resolved on DB-5 and DB-1701 columns. Since only 2- and 4-nitrodibenzopyranone have been identified in atmospheric samples, 3-nitrodibenzopyranone may prove suitable as an internal standard for quantitative analysis.Keywords
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