title: Factors influencing the sorption of oxytetracycline to soils.
abstract: Veterinary antibiotics such as oxytetracycline (OTC) increasingly are found in the environment and often come into direct contact with soils via the release of animal wastes. Oxytetracycline is known to sorb strongly to soils by interaction with soil organic matter, clay minerals, and metal oxides. However, current knowledge of the influence of soil properties on OTC sorption is limited, as is our ability to predict OTC sorption to soils. This work was aimed at identifying properties that most influence the extent of OTC sorption in a suite of soils from the eastern United States representing a wide range in soil properties. Thirty soils were well characterized, an OTC soil-water distribution coefficient (Kd) was determined for each soil, and statistical analyses were employed to determine appropriate soil descriptors of OTC sorption. Soil texture, cation exchange capacity, and iron oxide content seemed to most influence the extent of OTC sorption in soils with organic carbon (OC) content between 0 and 4%. Thus, the knowledge of these three soil properties would be key to anticipating the extent of OTC sorption and gaining insight into OTC fate within a given soil system. Notably, OC content appeared to influence OTC sorption only in a soil with 9% OC.
authors.affiliation: Duke University, Nicholas School of the Environment and Earth Sciences, Durham, North Carolina 27708-0328, USA.
authors.forename: Aaryn D
authors.initials: AD
authors.lastname: Jones
authors.forename: Gregory L
authors.initials: GL
authors.lastname: Bruland
authors.forename: Sheela G
authors.initials: SG
authors.lastname: Agrawal
authors.forename: Dharni
authors.initials: D
authors.lastname: Vasudevan
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D000077215:Clay; D008670:Metals / Q000737:chemistry; D008903:Minerals / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D010118:Oxytetracycline / Q000032:analysis / Q000737:chemistry*; D025341:Principal Component Analysis; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis*; D014481:United States; D014730:Veterinary Medicine; D014867:Water / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D008670:Metals; D008903:Minerals; D009930:Organic Chemicals; D010087:Oxides; D012987:Soil; D012989:Soil Pollutants; D014867:Water; D002244:Carbon; D000077215:Clay; D010118:Oxytetracycline