Monday, November 5, 2007
93-3
Tylosin Adsorption by Different Clay Minerals.
Jianjun Du1, Jim Wang2, and Zehua Zhou2. (1) Dept. of Environmental Science and Engineering, Zhongkai University of Agriculture and Technology, Guangzhou, China, (2) School of Plant, Environmental and Soil Sciences, Louisiana State University, 104 Madison B Sturgis Hall, Baton Rouge, LA 70803
Tylosin is an antibiotic used extensively in livestock production for both growth promotion and therapeutic purposes. Retention and decomposition characteristics of tylosin have been shown to relate to soil properties including clay content, cation exchange capacity, and pH. This study was carried out to evaluate the adsorption of tylosin by major clay minerals. Montmorillonite, illite and kaolinite were reacted with a series of solutions containing different levels of tylosin at different pH and ionic strength. Tylosin adsorption partition coefficients as described by linear model for Ca- and Na-rich montmorillonite, illite and kaolinite were 27.92, 13.04, 0.01 and 0.003 l/g, respectively. Matrix solution pH, ionic strength, and cations present also influenced adsorption capacity. The implication of these results will be discussed.