Size distributions of hydrocarbons in suspended particles from the Yellow River |
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| Authors: | Longjun Zhang Jiao Zhang Minna Gong |
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| Institution: | 1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, PR China;2. College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China;3. Pingdu Environmental Protection Administration, Qingdao 266700, PR China |
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| Abstract: | Suspended particle samples from the Yellow River estuary were sorted into five grain size fractions to explore the effect of grain size distribution on organic matter content and composition. The n-alkanes and PAHs were determined for each size fraction. PAHs and n-alkanes were more abundant in the finer fractions and the loading decreases steadily with increasing of grain size. However, the total n-alkanes or PAHs normalized to organic C were lower in the smaller size fractions than those in the larger size fractions, suggesting n-alkanes or PAHs may be diluted by the addition of organic matter or gradually decreased by degradation in the smaller size fractions. The particulate n-alkanes in the Yellow River estuary consist of a mixture of compounds from terrigenous and riverine biogenic n-alkanes and more biogenic n-alkanes accumulate in finer particles. Particulate PAHs are related to combustion/pyrolysis processes of coal/wood, and the relative contribution of petrogenic PAHs increase with increasing grain size. The total particulate n-alkane and PAH discharges passing the Lijin Station are about 3.94 t d−1 and 0.52 t d−1, respectively. Fine particles (<32 μm) play a significant role in organic matter transfer. |
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