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Ractopamine in particulate matter emitted from beef cattle feedyards and playa wetlands in the Central Plains
- Wooten, Kimberly J., Sandoz, Melissa A., Smith, Philip N.
- Environmental toxicology and chemistry 2018 v.37 no.4 pp. 970-974
- beef cattle, beta adrenergic receptors, feedlots, particulates, playas, ractopamine, sediments, United States
- Beef cattle in the United States are routinely administered ractopamine, a β‐adrenergic receptor agonist, to enhance growth. The present study is the first to quantify ractopamine in feedyard‐emitted particulate matter and playa wetlands near feedyards. Ractopamine was present in 92% of particulate matter samples, 16% of playa sediment samples, and 3% of playa water samples, at maximum concentrations of 4.7 μg/g, 5.2 ng/g (dry wt), and 271 ng/L, respectively. These data suggest that aerial transmission and deposition of particulate matter is a transport mechanism for ractopamine between feedyards and aquatic systems in the region. Environ Toxicol Chem 2018;37:970–974. © 2017 SETAC