Organic Matter of the Troposphere—II.: Natural Background of biogenic lipid matter in aerosols over the rural western United States |
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| Affiliation: | 1. Laboratoire de Spectrochimie Infrarouge et Raman, UMR-CNRS 8516, 2416, Université de Lille 1, Bât. C5, 59655 Villeneuve d''Ascq Cedex, France;2. UDSL, Physiopathologie des Maladies Osseuses et Inflammatoires EA4490, IMPRT-IFR114, 59000 Lille, France;3. Département Chimie et Environnement, Ecole Nationale Supérieure des Mines de Douai, 941, rue Charles Bourseul, BP 838, 59508 Douai Cedex, France;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710075, China;2. Analytical Chemistry Section, Council of Scientific and Industrial Research-National Physical Laboratory, New Delhi 110012, India;3. Department of Geographical Science and Environmental Engineering, Baoji University of Arts and Sciences, Baoji 721013, China;1. Department of Environmental Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710049, China |
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| Abstract: | Higher plant waxes are the predominant natural components in the lipid fractions (> C15) of aerosols sampled over rural and oceanic regions. Hydrocarbon, fatty acid, ketone and fatty alcohol fractions of the lipids were characterized in terms of their contents of homologous compound series and specific biogenic molecular markers. Particulate samples from the rural western United States have been analyzed and compared with samples from urban Los Angeles and remote areas over the Atlantic Ocean. The samples from rural sites contained predominantly vascular plant wax and lesser amounts of higher plant sterols and resin residues. Urban samples and, to varying degrees, some rural samples contained primarily higher weight residues of petroleum products. The loadings of hydrocarbons derived from higher plant waxes ranged approximately from 10 to 160 ng m−3 of air (for fatty acids, 10–100 ng m−3 and for fatty alcohols, 10–200 ng m−3). Higher molecular weight lipids (i.e. plant epicuticular wax, terpenes, etc.) from flora comprise a significant component of the organic carbon in rural aerosols. Primary biogenic residues are major components of aerosols in all areas and they are important components in the global cycling of organic carbon. |
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