Journal
RSC ADVANCES
Volume 5, Issue 120, Pages 98990-98998Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra20850e
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Funding
- National Natural Science Foundation of China [41376084]
- Program for New Century Excellent Talents in University [NCET-11-0464]
- Program for Innovative Research Team in University [IRT1289]
- Open Foundation of Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology of SOA [201402]
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The adsorption and desorption behaviors of dissolved petroleum hydrocarbons (DPHs) in a seawater-sediment system were investigated. Tidal flat sediment was used as the adsorbent, and crude oil was used as the adsorbate. The processes of adsorption and desorption at low concentration (<14.3 mg L-1) were described by the first-order kinetics model. The rate of desorption was slower than that of adsorption, and about 49% of the DPHs remained on the sediment. Therefore the potential risk of pollution would exist for a long time. The adsorption isotherms could be better fitted to the linear isotherm model than the Freundlich and Langmuir models. The adsorption process is a physical adsorption, because vertical bar Delta H vertical bar was 39.0 kJ mol(-1) which is less than 42.0 kJ mol(-1). The change in n-alkanes in the process was more obvious than the aromatics; the weathering loss rate was 25.56%, the emulsification loss rate of the dispersant was 0.65% and the microbial degradation rate was 15.46%. The results showed the degradation processes of petroleum hydrocarbons in tidal flats.
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