Characterization of Lipids from Airborne Dusts at Different Heights in Lower Troposphere

Zhang Jian; Sheng Guoying; Fu Jiamo; .R.T.Simoneit

The sovent-extractable organic matter(lipids) of eight airborne dust samples at different heights,which were collected at the meteorological tower of Beijing, in the city of Shuicheng and on the outskirts ofGuangzhou, using a standard volume air sample, were investigated to determine the distributions ofhomologous com pounds and molecular markers. All of collected sample filters were ultrasonically extractedin organic solvents. The extracts were esterified and then separated by TLC. Compound molecular structureof the fractions were characterized by GC-MS. These preliminary results show that all samples containn-alkanes. n-fatty acids, steranes, triterpanes. PAH and so on. derived from both biogenic sources(vascular plant wax and microbial lipids input) and fossil fuel contamination(coal. crude oil, etc.).Some apparent fractionatinon phenomena of lipids in dusts were observed in samlpes from different heightsabove ground. The upper is the height of dusts, the less is the lipid yield of particles. PAH compounds aremainly present in fine mode particles. The concentrations of P,AH，triterpane and sterane will decrease asthe sampling height incensing. Dusts in the upper atmosphere has significantly lower concentrations ofanthropogenic and microbial components. The analytical results also indicate that upper airborne dust trans-port over longer distances.

1. Guangzhou Branch of Institute of Geochemistry, Chinese Academy of Sciences;

2. Environmental Geochemistry Group, College of Oceanography. Oregon State University,Corvallis, Oregon 9733

Publish Date: 1991-12-31

Abstract: The sovent-extractable organic matter(lipids) of eight airborne dust samples at different heights,which were collected at the meteorological tower of Beijing, in the city of Shuicheng and on the outskirts ofGuangzhou, using a standard volume air sample, were investigated to determine the distributions ofhomologous com pounds and molecular markers. All of collected sample filters were ultrasonically extractedin organic solvents. The extracts were esterified and then separated by TLC. Compound molecular structureof the fractions were characterized by GC-MS. These preliminary results show that all samples containn-alkanes. n-fatty acids, steranes, triterpanes. PAH and so on. derived from both biogenic sources(vascular plant wax and microbial lipids input) and fossil fuel contamination(coal. crude oil, etc.).Some apparent fractionatinon phenomena of lipids in dusts were observed in samlpes from different heightsabove ground. The upper is the height of dusts, the less is the lipid yield of particles. PAH compounds aremainly present in fine mode particles. The concentrations of P,AH，triterpane and sterane will decrease asthe sampling height incensing. Dusts in the upper atmosphere has significantly lower concentrations ofanthropogenic and microbial components. The analytical results also indicate that upper airborne dust trans-port over longer distances.

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Characterization of Lipids from Airborne Dusts at Different Heights in Lower Troposphere

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