What question did this study set out to answer?

To determine and model the mechanisms controlling the sorption of three widely used tetracycline antibiotics onto montmorillonite and kaolinite clays under diverse solution chemistries.

December 3, 2003Environmental Science & Technology

Modeling Tetracycline Antibiotic Sorption to Clays

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To determine and model the mechanisms controlling the sorption of three widely used tetracycline antibiotics onto montmorillonite and kaolinite clays under diverse solution chemistries.
Measured sorption edges and isotherms for oxytetracycline, chlortetracycline, and tetracycline across varied pH, ionic strengths, and calcium salt concentrations.
Evaluated sorption behaviors on montmorillonite versus kaolinite clays, normalizing for differences in cation exchange capacity.
Modeled sorption data using a dual framework combining cation exchange and surface complexation of zwitterionic species.
Sorption edges were best predicted by coupling cation exchange with surface complexation of zwitterions, a process coupled to proton uptake that was favored on acidic clays.
Montmorillonite demonstrated greater sorption capacity than kaolinite across all tested pH levels at low ionic strength, even following cation exchange capacity normalization.
Calcium salts promoted oxytetracycline retention under alkaline conditions via surface bridging, whereas minor structural substitutions between the three tetracyclines yielded minimal effect on sorption.

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Implication

Laboratory experimental study demonstrates cation exchange and zwitterion complexation drive tetracycline sorption to clays, indicating environmental transport models must account for chemical...

Cite This Study

Figueroa et al. (2003) studied this question.

synapsesocial.com/papers/6a95d0f04c9277eb88e6ca57 https://doi.org/10.1021/es0342087

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Implication

Laboratory experimental study demonstrates cation exchange and zwitterion complexation drive tetracycline sorption to clays, indicating environmental transport models must account for chemical...

Modeling Tetracycline Antibiotic Sorption to Clays

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Implication

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Modeling Tetracycline Antibiotic Sorption to Clays

Key Points

Discussion

Implication

Cite This Study

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