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The increased use of veterinary antibiotics in modern agriculture for therapeutic uses and growth promotion has raised concern regarding the environmental impacts of antibiotic residues in soil and water. The mobility and transport of antibiotics in the environment depends on their sorption behavior, which is typically predicted by extrapolating from an experimentally determined soil-water distribution coefficient (K d ). Accurate determination of K d  values is important in order to better predict the environmental fate of antibiotics. In this paper, we examine different analytical approaches in assessing K d  of two major classes of veterinary antibiotics (sulfonamides and macrolides) and compare the existing literature data with experimental data obtained in our laboratory. While environmental parameters such as soil pH and organic matter content are the most significant factors that affect the sorption of antibiotics in soil, it is important to consider the concentrations used, the analytical method employed, and the transformations that can occur when determining K d  values. Application of solid phase extraction and liquid chromatography/mass spectrometry can facilitate accurate determination of K d  at environmentally relevant concentrations. Because the bioavailability of antibiotics in soil depends on their sorption behavior, it is important to examine current practices in assessing their mobility in soil.

Assessing antibiotic sorption in soil: a literature review and new case studies on sulfonamides and macrolides