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Oxolinic Acid Binding at Goethite and Akaganéite Surfaces: experimental Study and Modeling
Umeå University, Faculty of Science and Technology, Department of Chemistry. Ecole Nationale Supérieure de Chimie de Rennes, Rennes Cedex 7, France.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2016 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 50, no 2, 660-668 p.Article in journal (Refereed) Published
Abstract [en]

Oxolinic acid (OA) is a widely used quinolone antibiotic in aquaculture. In this study, its interactions with synthetic goethite (α-FeOOH) and akaganeite (β-FeOOH)particle surfaces were monitored to understand the potential fate of OA in marine sediments where these phases occur. Batch sorption experiments, liquid chromatography (LC) analyses of supernatants, attenuated total reflectance-Fouriertransform infrared (ATR-FTIR) spectroscopy and multisitecomplexation (MUSIC) modeling were used to monitor OAbinding at these particle surfaces. Both LC and ATR-FTIR showed that adsorption did not degrade OA, and that OA adsorption was largely unaffected by NaCl concentrations (10−1000 mM). This was explained further by ATR-FTIR suggesting the formation of metal-bonded complexes atcircumneutral to low pHc =−log [H+] and with a strongly hydrogen-bonded complex at high pHc. The stronger OAbinding to akaganeite can be explained both by the higher isoelectric point/point-of-zero charge (9.6−10) of this mineral than of goethite (9.1−9.4), and an additional OA surface complexation mechanism at the (010) plane. Geminal sites (≡Fe(OH2)2+)atthis plane could be especially reactive for metal-bonded complexes, as they facilitate a mononuclear six-membered chelate complex via the displacement of two hydroxo/aquo groups at the equatorial plane of a single Fe octahedron. Collectively, these findings revealed that Fe-oxyhydroxides may strongly contribute to the fate and transport of OA-type antibacterial agents inmarine sediments and waters.

Place, publisher, year, edition, pages
2016. Vol. 50, no 2, 660-668 p.
National Category
Chemical Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-124988DOI: 10.1021/acs.est.5b04940ISI: 000368563400016PubMedID: 26678217OAI: oai:DiVA.org:umu-124988DiVA: diva2:957218
Available from: 2016-09-01 Created: 2016-09-01 Last updated: 2017-01-18Bibliographically approved

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