Journal
CHEMOSPHERE
Volume 79, Issue 8, Pages 786-793Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2010.03.017
Keywords
Pharmaceuticals; Veterinary; Emerging contaminants; Fate; Empirical sorption models; Speciation
Categories
Funding
- National Science Foundation [BES-0225696]
- US Department of Agriculture [2002-35107-12258]
- Center for Environmental Sciences and Engineering at the University of Connecticut
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Sorption coefficients (K-d) of fluoroquinolone, tetracycline, and sulfonamide antimicrobial compounds were measured for seven soils between pH 4.5 and 8.5 using batch sorption techniques. Soils were chosen to encompass a range of cation exchange capacity (CEC), iron and aluminum oxide and organic matter contents. For most soil-pH pairs, enrofloxacin, norfloxacin, and ciprofloxacin K-d values were within a factor of 2 (0.3 log units) of each other. Lower enrofloxacin sorption than norfloxacin or ciprofloxacin sorption was observed at pH 8.5 for the two most aluminosilicate clay-rich soils, likely due to compound differences in acid dissociation constants, yielding greater anion species abundance for enrofloxacin. Tetracycline, oxytetracycline and chlortetracycline K-d values also were within a factor of 2 for each soil-pH pair. Measured tetracycline and fluoroquinolone compound K-d values could be estimated within a factor of 2 using published empirical multi-linear regression models. In contrast, sulfonamide K-d values varied among compounds, as expected for sorbates that interact primarily with soil organic matter. Results of this research indicate that substituent groups have little effect on sorption interactions of compounds from the tetracycline and fluoroquinolone family that interact with soils primarily through cation exchange, surface complexation and cation bridging sorption mechanisms. (C) 2010 Elsevier Ltd. All rights reserved.
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