Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 503672
Title Adsorption of Levofloxacin to Goethite : Batch and Column Studies
Author(s) Qin, Xiaopeng; Liu, Fei; Zhao, Long; Hou, Hong; Wang, Guangcai; Li, Fasheng; Weng, Liping
Source Environmental Engineering Science 33 (2016)4. - ISSN 1092-8758 - p. 235 - 241.
Department(s) Soil Physics and Land Management
Sub-department of Environmental Technology
Chair Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) antibiotic - CXTFIT - Desorption - Hemimellitic acid - Phthalic acid - STANMOD

Batch experiments were conducted to investigate the adsorption of a widely used fluoroquinolone antibiotic levofloxacin (LEV) to goethite and effects of nitrate, sulfate, small organic acids, and humic acid (HA). The concentrations of LEV and small organic acids in single systems or mixtures were determined by a high-performance liquid chromatography. Presence of nitrate or sulfate almost had no influence on the adsorption of LEV to goethite. HA promoted the adsorption significantly, and similar results were also observed in column experiments. LEV adsorption to goethite increased slightly in the presence of small organic acids. The π-π interactions between LEV molecules and the aromatic ring of organic acids (or HA) might be the main mechanism. In column experiments, LEV adsorption to the goethite-coated sand was well fitted with the two-site nonequilibrium model using the CXTFIT 2.1 program within the software STANMOD. The desorption process was well predicted with the model using the same parameters. In the presence of HA, more LEV was adsorbed to goethite-coated sand, and the desorption process showed some delay. Some LEV adsorbed to goethite-coated sand could not be desorbed with NaCl but was desorbed with phosphate. Presence of HA (or natural organic matters, phosphate) had a great influence on the mobility and distribution of LEV in soils and waters, which might also affect its degradability and antibacterial activity. Results obtained in this study were seldom reported in previous studies, which help us to better understand the behavior of antibiotics in the natural environment.

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