Silicate surface coverage controls quinolone transport in saturated porous media
2022
Zhou, Lian | Cheng, Wei | Marsac, Remi | Boily, Jean-François | Hanna, Khalil | Ecole Nationale Supérieure de Chimie de Rennes (ENSCR) | Umeå University = Umeå Universitet | Géosciences Rennes (GR) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des sciences de l'environnement de Rennes (OSERen) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Institut universitaire de France (IUF) ; Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.) | Institut Universitaire de France (IUF) | Swedish Research Council (2016-03808; 2020-04853). | CNRS (PICS 2018-2020) | ANR-18-CE01-0008,C-FACTOR,Le devenir des contaminants est contrôlé par la spéciation de la matière organique colloïdale(2018)
International audience
Show more [+] Less [-]English. Although silicates are the most common anions in aquatic systems, little is known on the roles they play on the transport of emerging contaminants, such as antibiotics. Using dynamic column experiments, we revealed the controls of Si loadings on goethite (α-FeOOH) coated sands on the transport of a widely used quinolone antibiotic, here focusing on Nalidixic Acid (NA). We find that dynamic flow-through conditions (2.98 cm/h and 14.92 cm/h) sustain monomeric Si species with loadings of up to ∼0.8 Si/nm2 but that oligomeric species can form at the goethite surfaces under static (batch, no-flow conditions). While these monomeric species occupy no more than ∼22 % of the reactive OH groups on goethite, they can effectively suppress NA binding, and therefore enhance NA mobility in dynamic conditions. NA can also bind on goethite when it is simultaneously injected with high concentrations of Si (2000 µM), yet it becomes progressively replaced by Si over time. Combining kinetics and surface complexation modeling, we present a new transport model to account for the stepwise polymerization of Si on goethite and NA transport. Our findings show that dissolved Si common to natural surface waters can play a determining role on the surface speciation and transport of antibiotics in the environment.
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