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Published online 9 August 2006
Published in J Environ Qual 35:1779-1783 (2006)
DOI: 10.2134/jeq2005.0345
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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TECHNICAL REPORTS

Organic Compounds in the Environment

Sorption–Desorption of Carbamazepine from Irrigated Soils

C. F. Williamsa,*, C. F. Williamsb and F. J. Adamsena

a USDA-ARS, U.S. Arid Land Agricultural Research Center, 21881 N. Cardon Ln., Maricopa, AZ 85239
b Department of Plant and Animal Science, Brigham Young University, Provo, UT 84602

* Corresponding author (cwilliams{at}uswcl.ars.ag.gov)

Received for publication September 12, 2005. Th anti-seizure medication carbamazepine is often found in treated sewage effluent and environmental samples. Carbamazepine has been shown to be very persistent in sewage treatment, as well as ground water. Due to environmental persistence, irrigation with sewage effluent could result in carbamazepine contamination of surface and ground water. To determine the potential for leaching of carbamazepine, a series of adsorption and desorption batch equilibrium experiments were conducted on irrigated soils. It was found that carbamazepine adsorption to biosolid-amended (T) soils had a KD of 19.8 vs. 12.6 for unamended soil. Based on adsorption, carbamazepine leaching potential would be categorized as low. During desorption significant hysteresis was observed and KD increased for both soils. Desorption isotherms also indicate a potential for irreversibly bound carbamazepine in the T soil. Results indicate that initial removal of carbamazepine via adsorption from irrigation water is significant and that desorption characteristics would further limit the mobility of carbamazepine through the soil profile indicating that carbamazepine found in sewage effluent used for irrigation has a low leaching potential.

Abbreviations: T, soil with biosolid application • UT, soil without biosolid amendment • AD, adsorption • DS, desorption • KD, distribution coefficient • EC, electrical conductivity • SAR, sodium adsorption ratio • SPE, solid phase extraction






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