Journal
ENVIRONMENTAL POLLUTION
Volume 171, Issue -, Pages 185-190Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2012.07.037
Keywords
Antibiotics; Diffusion; Two-compartment sorption; Environmental fate; Multi-domain sorption
Categories
Funding
- National Scientific Foundation of China [40973081, 40803034]
- Recruitment Program of Highly-Qualified Scholars in Yunnan [2010CI109]
- Research Grant for Future Talents of Yunnan Province
- State Key Laboratory of Pollution Control and Resource Reuse [PCRRF11032]
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The environmental behavior of antibiotics is not well known and the precise environmental risk assessment is not practical. This study investigated the sorption kinetics of ofloxacin, a widely used antibiotics, on soil particles with different organic carbon contents as well as soil components (a humic acid, ferric oxide and kaolinite). Two-compartment sorption kinetics were mathematically recognized (except ferric oxide because of its very fast sorption). The apparent sorption rate and the contribution of fast sorption compartment decreased with the increased organic carbon content with the exception of humic acid, suggesting that the slow sorption sites were partially located in organo-mineral complex. The OFL concentration-dependent sorption kinetics suggested that the slow sorption compartment was not controlled by diffusion process as indicated by slower sorption at higher OFL loading. The difference between OFL sorption kinetics and those of hydrophobic organic contaminants was discussed and possible mechanism of OFL two-compartment sorption was proposed. (C) 2012 Elsevier Ltd. All rights reserved.
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