Organic Geochemical Studies on Sinking Material of the Atmosphere and Airborne Particulates in Lanzhou City
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摘要: 本文研究了兰州市大气自然沉降物的有机质通量、自然沉降物中正构烷烃分布特征以及自然沉降物和飘尘中脂肪酸分布特征,这些研究在兰州地区尚属首次。结果表明自然沉降物中有机质通量较高;自然沉降物和大气飘尘中有机质主要来自化石燃料燃烧产物,部分来自现代高等植物和微生物。这些研究结果对于兰州市大气污染源的了解和治理具有一定的参考价值。Abstract: In this paper, Organic geochemistry of sinking material of the atmosphere and airborne particulates in Lanzhou was studied.The result show that sinking materal of the atmosphere in L.anzhou contain higher organic matter. n-Alkanes in sinking materat,with low odd-over-even predominance, are dominated by short chain component. Saturated n-fatty acids in sinking materaland airborne particulates have a strong even-over-odd predominance and short saturated n-fatty acids are major component.Unsaturated and iso-fatty acids are present in low abundance. Distuibution of n-alkanes and fatty acid indicate that organic mat-ter in sinking material of the atmosphere and airborne patricuiates in Lanzhou are derived mainly from fossil fuel contamination andpartly from vascular plants and mieroorganisms
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