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Sorption and Transport of Veterinary Pharmaceuticals in Soil—A Laboratory Study
Author(s) -
Lee Jaehoon,
Seo Youngho,
Essington Michael E.
Publication year - 2014
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2013.11.0490
Subject(s) - loam , chemistry , manure , sorption , soil water , environmental chemistry , dissolved organic carbon , agronomy , soil science , adsorption , environmental science , organic chemistry , biology
Land application of manure can change soil chemical properties, thus affecting fate and mobility of agricultural antibiotics in soil. The main objective of this study was to examine the effects of dissolved organic C (DOC) and background electrolyte cation type on the sorption and transport of chlortetracycline (CTC), tylosin (TYL), and sulfamethazine (SMT) in two different soils. A series of batch isotherm and column miscible displacement experiments were conducted using surface and subsurface soils of Etowah clay loam (fine‐loamy, siliceous, semiactive, thermic Typic Paleudults) and Captina sandy loam (fine‐silty, siliceous, active, mesic Typic Fragiudults). Decreased retention of CTC and TYL to soils was observed in the presence of Ca 2+ ion compared with Na + . For example, the Freundlich coefficient ( K F ) for TYL ranged from 67 to 341 under a Na + system while it ranged from 17 to 173 under a Ca 2+ system. Sorption of CTC and TYL decreased on the addition of DOC extracted from dairy manure, while SMT sorption increased by DOC addition. For example, in the Ca 2+ system, CTC K F values without DOC ranged from 2.40 × 10 3 to 4.84 × 10 3 while they ranged from 1.52 × 10 3 to 2.86 × 10 3 with the addition of DOC. Column transport experiments generally agreed with the batch study results, showing increased CTC mass recovery in effluents (i.e., increased from 2.1–4.3% for both surface and subsurface soils) and decreased retardation factors (R) in the presence of dairy manure DOC (i.e., from 890–371). The reduced CTC adsorption may be explained by competition between the DOC and CTC for sorption sites or by the aqueous association of CTC with DOC. Elevated levels of DOC also resulted in increased mobility of TYL and SMT for surface soil column. In summary, changes in background electrolyte cation type and DOC level in soil solution caused by addition of animal manure can influence fate and transport of agricultural antibiotics in soils.