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Modelled phototransformation kinetics of the antibiotic sulfadiazine in organic matter-rich lakes
Univ Torino, Dept Chem, Via Pietro Giuria 5, I-10125 Turin, Italy;Univ Torino, NatRisk Interdept Ctr, Largo Paolo Braccini 2, I-10095 Grugliasco, TO, Italy.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2018 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 645, p. 1465-1473Article in journal (Refereed) Published
Abstract [en]

Xenobiotic compounds are commonly detected in inland waters. Sunlight-induced photochemical reactions contribute to xenobiotic degradation, but the role of different photoreactions on large geographic scales remains poorly understood. Here, we used a combination of photochemical modelling and large-scale field data from 1020 lakes across Sweden to elucidate the photodegradation kinetics of the commonly used antibiotic sulfadiazine (SDZ) in organic matter-rich lakes. SDZ occurs in two forms, namely acidic HSDZ (pK(a) = 6.5) and basic/deprotonated SDZ . Both species are oxidised fast by the photogenerated triplet states of natural organic matter ((NOM)-N-3*). However, they also undergo efficient back reactions because the partially oxidised HSDZ (and SDZ(-) to a larger extent) can be reduced back to the initial compounds by the phenolic moieties contained in NOM. Typical lakes in Sweden are rich in NOM and have low pH, with the consequence that SDZ photochemistry would be dominated by HSDZ. Our simulation results showed that SDZ photodegradation kinetics in Swedish lakes would become significantly slower with increasing water depth and pH, while it depended little on latitude, which affects irradiance, or on organic matter content. As a consequence, SDZ would be particularly persistent in lakewater in some densely populated areas with relatively deep and high-pH lakes such as, most notably, the Stockholm region. Here the surface waters could be more heavily contaminated by pharmaceuticals compared to the scarcely populated regions in the centre-north of the country, where lakewater could otherwise promote an efficient photodegradation of SDZ.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 645, p. 1465-1473
Keywords [en]
Sulfonamides, Surface-water photochemistry, Triplet sensitisation, Natural organic matter, Back reactions
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-363195DOI: 10.1016/j.scitotenv.2018.07.206ISI: 000445164200143PubMedID: 30248868OAI: oai:DiVA.org:uu-363195DiVA, id: diva2:1256979
Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2018-10-18Bibliographically approved

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