Tylosin, a widely used veterinary antibiotic and growth promoter in daily poultry and swine feed, is related to the prevalence of genes for the resistance of macrolide such as erythromycin, an important macrolide human antibiotic.  As a result, there have been growing concerns on its possible adverse effects on natural ecosystems.  As a weak base, the main mechanism for tylosin sorption in soil is cation exchange and the minerals play important roles.  In this study, we investigated the sorption of tylosin by pure clay minerals in varies ionic strength and ions, as well as the interlayer interaction of tylosin on different type of montmorillonite.  Sorption data were fitted with Langmuir-Freundlich-Hill sorption model to discuss the electrostatic and specific interaction for non-ideal adsorption.  The sorption capacity of tylosin at different ionic strengths decreased with the order of 0.008 M > 0.051 M > 0.108 M > 0.508 M.  For specific ionic strength, the sorption of tylosin decreased in the following order of ions: K+ > Na+ > Ca2+ ? Mg2+.  It should be noticed that the sorption displayed an opposite tendency for montmorillonite at low initial concentration of tylosin.  It indicated that there might be existed the other interactive besides cation exchange in the sorption process. The sorption of tylosin on different montmorillonite decreased in the order of Ca-montmorillonite > Na-montmorillonite > K-montmorillonite.  It seems that interlayer hydration could influence the sorption of tylosin.

Ionic strength effects on the sorption of tylosin on clay minerals

244th National Meeting (2012)

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