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000022934 084__ $$2WoS$$aEnvironmental Sciences
000022934 1001_ $$0P:(DE-Juel1)VDB95037$$aSittig, S.$$b0$$uFZJ
000022934 245__ $$aLong-Term Sorption and Sequestration Dynamics of the Antibiotic Sulfadiazine: A Batch Study
000022934 260__ $$aMadison, Wis.$$bASA [u.a.]$$c2012
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000022934 440_0 $$03300$$aJournal of Environmental Quality$$v41$$x0047-2425$$y5
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000022934 500__ $$aWe would like to thank the German Research Foundation (DFG) for financial support (FOR 566), Bayer HealthCare (Wuppertal, Germany) for providing the radiolabeled sulfadiazine, and the Division of Soil Science (INRES) at the University of Bonn for analyzing the soil textures. Furthermore, we would like to acknowledge contributions made by Stephan Koppchen, who performed the Radio-HPLC measurements, as well as Max Gotta and Katharina Nobis, who provided laboratory support.
000022934 520__ $$aUnderstanding the long-term sequestration of veterinary antibiotics into soil fractions with different bioavailability is important in terms of assessing their eco-toxicological impact. We performed 60-d batch sorption experiments with radiolabeled sulfadiazine (SDZ) using samples from two agricultural soils. Sequential extraction with CaCl/MeOH (easily accessible fraction), microwave (residual fraction, RES), and combustion (nonextractable residues, NER) was used to quantify the sequestration dynamics of the C-derived SDZ-equivalent concentration. Multiple harsh extractions allowed us to mathematically extrapolate to the amount of SDZ equivalents that can be potentially extracted, resulting in halving the NER fraction after 60 d. A modified two-stage model with irreversible sorption combined with global parameter optimization was able to display the sequestration dynamics. We demonstrated this with sterilized samples in which no transformation of the parent compound was observed. This also showed that transformation was primarily biologically driven. These modeling results verified the procedure, which was then applied to nontreated samples from both soils to estimate effective parameter values for SDZ-derived equivalents. Observed initial sorption, to which up to 20% of the kinetic sorption sites attributed, was included in the model. Both the RES and NER fractions reached a sorption plateau, with NER occupying about 30% of the kinetic fraction (RES+NER) for all soils. The sorption and sequestration of SDZ were soil-specific and dominated by kinetics. Sequestration in the RES fraction was much slower (characteristic time: 60 d) than the redistribution in the NER fraction (characteristic time: <6 d). The work presented here contributes to the prediction of the dynamics of (bio-)availability.
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000022934 7001_ $$0P:(DE-Juel1)VDB724$$aKasteel, R.$$b1$$uFZJ
000022934 7001_ $$0P:(DE-Juel1)129462$$aGroeneweg, J.$$b2$$uFZJ
000022934 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b3$$uFZJ
000022934 773__ $$0PERI:(DE-600)2050469-X$$a10.2134/jeq2011.0467$$gVol. 41, p. 1497 -1 506$$p1497 -1 506$$q41<1497 -1 506$$tJournal of environmental quality$$v41$$x0047-2425$$y2012
000022934 8567_ $$uhttp://dx.doi.org/10.2134/jeq2011.0467
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