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The DOI matches its Crossref record; 12 of the 12 references it cites were found in a registry or an index.

Investigating the Molecular Interactions of Oxytetracycline in Clay and Organic Matter: Insights on Factors Affecting Its Mobility in Soil

Kulshrestha, Pankaj, Giese,, Rossman F., Aga, Diana S.·2004·Environmental Science & Technology

Abstract

The interactions of oxytetracycline with model clay adsorbents were investigated as a function of suspension pH. The clay adsorbents used were native montmorillonite (SWy-2), Na-montmorillonite (Na-SWy-2), and hexadecyl trimethylammonium-montmorillonite (HDTMA-montmorillonite). The adsorption of oxytetracycline to the clay could be described by Freundlich-type adsorption isotherms. It was observed that the adsorption of oxytetracycline in the native and sodium forms of montmorillonite decreases with increasing pH in the order pH 1.5 > 5.0 > 8.7 > 11.0. This trend is consistent with cationic exchange interactions that are dominant at lower pH values when oxytetracycline has a net positive charge. On the other hand, hydrophobic interactions when oxytetracycline is zwitterionic (at pH 5.0) are predominant over other mechanisms, as evident from the FT-IR spectrum of the HDTMA-montmorillonite and humic acid-montmorillonite adsorbed with oxytetracycline. The presence of a large amount of dissolved organic matter (DOM) was also found to decrease the sorption of oxytetracycline to clay, suggesting that DOM may increase its mobility in the natural environment. Several mechanisms of interaction of oxytetracycline in clay are proposed based on the adsorption isotherms and the results from X-ray diffraction (XRD) and Fourier transform-infrared (FT-IR) analyses.

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Metadata

Authors
Kulshrestha, P., Giese, & Aga, D. S.
Venue
Environmental Science & Technology
Published
2004-06-16
Volume
38
Issue
15
Pages
4097-4105
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2044780591
Cited by
527
References
12
FWCI
10.59
Type
journal article
Language
en
Open access
closed

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