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Title: Photodegradation of sulfamethoxazole in environmental samples: the role of pH, organic matter and salinity
Author: Oliveira, Cindy
Lima, Diana L D
Silva, Carla Patrícia
Calisto, Vânia
Otero, Marta
Esteves, Valdemar I
Keywords: Humic Substances
Sulfonamide antibiotics
Apparent direct quantum yield
Emerging contaminants
Issue Date: 15-Jan-2019
Publisher: Elsevier
Abstract: Sulfamethoxazole (SMX) is the most representative antibiotic of the sulfonamides group used in both human and veterinary medicine, and thus frequently detected in water resources. This has caused special concern due to the pronounced toxicity and potential to foster bacterial resistance of this drug. Therefore, and to further understand the fate of SMX in the aquatic environment, its photodegradation under simulated solar radiation was here studied in ultrapure water and in different environmental samples, namely estuarine water, freshwater and wastewater. SMX underwent very fast photodegradation in ultrapure water, presenting a half-life time (t1/2) of 0.86 h. However, in environmental samples, the SMX photodegradation rate was much slower, with 5.4 h < t1/2 < 7.8 h. The main novelty of this work was to prove that pH, salinity and dissolved organic matter are determinant factors in the decrease of the SMX photodegradation rate observed in environmental samples and, thus, they will influence the SMX fate and persistence, potentially increasing the risks associated to the presence of this pollutant in the environment.
Peer review: yes
DOI: 10.1016/j.scitotenv.2018.08.235
ISSN: 0048-9697
Appears in Collections:CESAM - Artigos
DAO - Artigos
DQ - Artigos

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