Abstract
Veterinary pharmaceuticals are emerging contaminants found throughout the environment, and their presence and effects are a matter of concern. The purpose of this study was to compare the phytotoxicity of salinomycin (pure compound = 96 %) and Sacox 120 (formulated product = 120 g salinomycin/kg) to the plant species Brassica rapa as well as to investigate salinomycin persistence in soil. Calculated EC/IC50 values for salinomycin and Sacox 120 were 1.10 and 2.88 and 2.19 and 18.03 mg/kg, respectively, based on salinomycin concentration. For exposure of B. rapa to salinomycin, significant adverse effects were observed for growth end points at the greater concentrations. For the reproduction end point (i.e., number of buds), as well as root length and wet mass, significant differences were observed at the lower concentrations (stimulating growth) and adverse effects at the greater concentrations. This study confirmed that the toxic effects of Sacox 120 are attributable to the active ingredient salinomycin. Liquid chromatography–electrospray ionization–mass spectrometry analyses confirmed that exposure concentrations of salinomycin were 90 and 83 % of the nominal concentrations, respectively, in the soils amended with either pure or formulated product. At the end of the experiment, after 14 days, salinomycin concentrations for both tests (salinomycin and Sacox 120) decreased to 6.2 and 5.8 % of the nominal exposure concentrations, respectively. Detected salinomycin concentrations in plant shoots ranged from 3.47 to 41.0 ng/g dry shoot. This study shows the importance of using plants as tools to evaluate environmental risk and as a bridge to relate environment and human health risks.
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We thank Health Canada and Environment Canada for providing funds to conduct this research and gratefully acknowledge Stantec Consulting, Ltd., for the in-kind contributions by way of Stantec’s R&D Program.
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Furtula, V., Stephenson, G.L., Olaveson, K.M. et al. Effects of the Veterinary Pharmaceutical Salinomycin and its Formulation on the Plant Brassica rapa . Arch Environ Contam Toxicol 63, 513–522 (2012). https://doi.org/10.1007/s00244-012-9807-y
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DOI: https://doi.org/10.1007/s00244-012-9807-y