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The cation exchange behavior of tylosin in loess-derived soil.

08:00 EDT 4th June 2019 | BioPortfolio

Summary of "The cation exchange behavior of tylosin in loess-derived soil."

Tylosin (Tyl) is a veterinary antibiotic commonly used in swine and poultry production. Due to metabolic inefficiencies, it enters the environment through manure applications. Ion exchange is an important retention mechanism for Tyl, particularly for smectite clay. The objectives of this study are to characterize the exchange interactions of Tyl with common soil cations in subsoil horizons that contain smectite and to investigate the interactions using in situ Fourier transform infrared (FTIR) spectroscopy. Adsorbed Tyl in pH neutral, smectitic subsoil horizons is divided into exchangeable and nonexchangeable forms. The percentage of adsorbed Tyl that is exchangeable varies from 36% to 43% when Na is the competing cation, and from 57% to 66% when Ca competes. In NaX-TylX binary exchange systems, neither Na nor Tyl is preferred by the clay exchange phase, and the Vanselow selectivity coefficients (K) for the NaX→TylX exchange reaction range between 0.79 and 1.41. In the CaX-TylX systems, Tyl is preferred by the clay exchange phase when the equivalent fraction of TylX (E) is less than 0.4. The K values for the CaX→TylX exchange reaction are at a maximum at the lowest E values, with 17.6

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This article was published in the following journal.

Name: Chemosphere
ISSN: 1879-1298
Pages: 615-624

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