Citation: | YANG Da, GAO Shu, LI Jia-biao, ZOU Xin-qing, SHENG Hui. Adsorption of PAHs by the sediments from the Yangcheng tidal flat: the influence of particle size[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 54-61. doi: 10.16562/j.cnki.0256-1492.2020071401 |
In order to study the adsorption behavior of the intertidal sediment adsorption of polycyclic aromatic hydrocarbons (PAHs), we use the Soxhlet extraction method, characteristic ratio method, statistical analysis, isothermal adsorption experiment, together with sediment adsorption parameter modeling and inverse calculations for three different particle size groups (i.e., 0~31 μm, 32~64 μm, and > 64 μm) to identify the influence of particle size on the adsorption parameter. The results reveal that the contents of PAHs varied from 49.67~141.90 ng·g−1, with an average of 74.92 ng·g−1. The PAHs were primarily trinuclear, tetracyclic or pentacyclic, and the surface sediment PAHs in the study area had a mixed origin of combustion. When the organic matter content in sediments is relatively low, particle size plays a major role in PAHs adsorption.
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Sampling site for the tidal flat sediment cores
Vertical distributions of sediment mean grain size, TOC and PAHs content in the Yancheng tidal flat
Down-core variations of the composition of PAHs with different ring numbers
The sorption parameters of PAHs associated with three different sediment sizes
The sorption parameters of low-ring, middle-ring and high-ring PAHs with three different sediment sizes
Comparison of PAHs adsorption by sediments predicted by the-Freundlich model and the actual adsorption of the Yancheng tidal flat sediments