Organic composition in the dry season rainwater of Guangzhou, China |
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Authors: | Tao Xu Zhiguang Song Junfeng Liu Cuiping Wang Jianrong Wei Heng Chen |
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Institution: | (1) State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, P.R. China;(3) Gudao Oil Plant, Shengli Oil Field, Dongying, 257231, P.R. China |
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Abstract: | This paper reports the results from a study of the organic composition of rainwater collected at Tianhe district of Guangzhou
city, P.R. China, during the dry season. Several special setups of a pyrex bottle with a glass funnel were used for the collection
of the rainwater. Three fractions (aliphatics, PAHs and fatty acids) were separated from the total extracted organic compounds
and identified with GC-MS. The molecular diagnostic ratios were utilized for the source reconciliation. The aliphatic hydrocarbon
and the biomarkers (triterpanes and steranes) distribution show a characteristic of the petrochemical source in the rainwater
samples. The PAHs diagnostic ratios e.g. MP/P, MPI, Fl/ (Fl + Py)] indicated vehicular emissions. The fatty acids ratios
(e.g. C18:1/C18:0 and C18:2/C18:0) reflect the contribution of cooking emissions, while the higher plant waxes play little part. Moreover, the values of MP/P,
MPI, BaA/(BaA + CT) and BeP/(BeP + BaP) reflected the origin of the long-distance transportation to some extent. On the whole,
for the dry season rainwater, all molecular diagnostic ratios indicated the complexity of the organic composition of the rain,
which have the characteristics of both a local emission contribution and a long-distance transportation contribution. |
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Keywords: | Aliphatics Fatty acids Organic composition PAHs Rainwater |
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