A model assessment of the importance of direct photolysis in the photo-fate of cephalosporins in surface waters: Possible formation of toxic intermediates

Fabbri, Debora; Minella, Marco; Maurino, Valter; Minero, Claudio; Vione, Davide

doi:10.1016/j.chemosphere.2015.04.102

Cited by 21 publications

(5 citation statements)

References 38 publications

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“…Additionally, for a 10-fold increase in depth, t 1/2 increases 81 and 318% for the minimum and maximum DOC levels, respectively. Similar results were obtained by Fabbri et al (2015) who studied the photochemical fate of cephalosporins in surface waters and reported amoxicillin half-life times increasing up to a plateau with increasing DOC (Fabbri et al 2015). According to Passananti et al (2014), high DOC means elevated DOM and CDOM contents.…”

Section: Photochemical Modelingsupporting

confidence: 79%

“…Silva et al (2015) explained that the combined effect of nitrite and water depth on amicarbazone half-life does not depend on nitrate and bicarbonate levels. Similar results were obtained by Fabbri et al (2015), who reported that water parameters such as nitrate, nitrite, and inorganic carbon would be barely important for amoxicillin direct photolysis.…”

supporting

confidence: 88%

“…For high DOC, direct photolysis can be affected due to the competitive effect between the substrate and CDOM for sunlight photons. In addition, while CDOM is a photochemical source of HO • radicals, DOM can act as an important HO • scavenger (Fabbri et al 2015).…”

Section: Photochemical Modelingmentioning

confidence: 99%

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Direct and indirect photolysis of the antibiotic enoxacin: kinetics of oxidation by reactive photo-induced species and simulations

Lastre-Acosta

Barberato

Parizi

et al. 2018

Environ Sci Pollut Res

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The purpose of this study was to investigate the aqueous phase photochemical behavior of enoxacin (ENO), an antibiotic selected as a model pollutant of emerging concern. The second-order reaction rate constants of ENO with hydroxyl radicals (HO) and singlet oxygen (O) were determined at pH 3, 7, and 9. Also, the rate constants of the electron transfer reaction between ENO and triplet states of chromophoric dissolved organic matter (CDOM*) are reported for the first time, based on anthraquinone-2-sulfonate (AQ2S) as CDOM proxy. The sunlight-driven direct and indirect ENO degradation in the presence of dissolved organic matter (DOM) is also discussed. The results show that direct photolysis, which occurs more rapidly at higher pH, along with the reactions with HO and AQ2S*, is the key pathway involved in ENO degradation. The ENO zwitterions, prevailing at pH 7, show k HO, k, and k of (14.0 ± 0.8) × 10, (3.9 ± 0.2) × 10, and (61.5 ± 0.7) × 10 L mol s, respectively, whose differences at pH 3, 7, and 9 are due to ENO pH-dependent speciation and reactivity. These k values, along with the experimental ENO photolysis quantum yield, were used in mathematical simulations for predicting ENO persistence in sunlit natural waters. According to the simulations, dissolved organic matter and water depth are expected to have the highest impacts on ENO half-life, varying from a few hours to days in summertime, depending on the concentrations of relevant waterborne species (organic matter, NO, NO, HCO).

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Section: Photochemical Modelingsupporting

confidence: 79%

supporting

confidence: 88%

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Direct and indirect photolysis of the antibiotic enoxacin: kinetics of oxidation by reactive photo-induced species and simulations

Lastre-Acosta

Barberato

Parizi

et al. 2018

Environ Sci Pollut Res

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“…This is because its light adsorption capacity and quantum yield for direct photolysis result in the highest direct photodegradation rate among the tested OMPs. In addition, its photodegradation reaction rate with singlet oxygen in indirect photolysis is also the highest, although there was little difference among the four OMPs in terms of the reaction rates to the other reactive intermediates [30,33,[68][69][70].…”

Section: Sensitivity Of Vertical Omps Distribution To Physical Condit...mentioning

confidence: 97%

Integration of Photodegradation Process of Organic Micropollutants to a Vertically One-Dimensional Lake Model

2023

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Photochemical reactions in the water environments are essential for understanding the fate of organic pollutants, which exist widely in aquatic environments causing potential risks. Therefore, this study aimed to integrate a module of the photodegradation process into a vertically one-dimensional model of the lake to quantify the influence of phytoplankton on the photodegradation process for the first time. After adjusting the code of the APEX (Aqueous Photochemistry of Environmentally occurring Xenobiotics), the suite of photochemical reactions was integrated into the pollutant module of MyLake (Multi-year Lake simulation), as MyLake-Photo. This integrated model was then applied to calculate the concentration of four organic micropollutants under the ranges of solar radiation conditions (0–390 W/m2), phytoplankton biomass (0.01–20 mg/m3 of chlorophyll), and water temperature (1–25 °C). These scenario analyses revealed that phytoplankton biomass and pollutant photodegradation are negatively correlated owing to the light absorption by chlorophyll. Thermal stratification also significantly influenced the vertical distribution of organic micropollutants. Then, the model was applied for calculating a temporal distribution of ibuprofen concentration in Lake Giles (PA, USA) with a simple but realistic assumption. The concentration of organic micropollutants varies with seasons, which was mainly affected by the changes in irradiance and water temperature. In this manner, the integrated model is capable of estimating the temporal and vertical shifts of the concentration of organic micropollutants in lakes, allowing us to investigate the fate of organic micropollutants in lakes. The integrated model also allows us to investigate the effect of phytoplankton and CDOM on the photodegradation of organic micropollutants, which should be combined with field surveys and experimental studies for further improvement.

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“…Moreover, biotic and abiotic degradation of cephalosporins was reported in China, in lake surface water and sediment, with a maximum decrease of half-life from 18.7 days in the dark to 4.1 days under exposure to simulated sunlight (Jiang et al, 2010). The direct photolysis for environmental degradation of cephalosporins might be important in surface water bodies with depth 2e3 m (Fabbri et al, 2015). For TRI, an environmental half-life of 5.7 days was measured in freshwater and of 20 min under photodegradation (Straub, 2013).…”

Section: Antibiotic Dissipation Downstream Of the Wwtp Dischargementioning

confidence: 99%

Occurrence of antibiotics in rural catchments

et al. 2017

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A model assessment of the importance of direct photolysis in the photo-fate of cephalosporins in surface waters: Possible formation of toxic intermediates

Cited by 21 publications

References 38 publications

Direct and indirect photolysis of the antibiotic enoxacin: kinetics of oxidation by reactive photo-induced species and simulations

Direct and indirect photolysis of the antibiotic enoxacin: kinetics of oxidation by reactive photo-induced species and simulations

Integration of Photodegradation Process of Organic Micropollutants to a Vertically One-Dimensional Lake Model

Occurrence of antibiotics in rural catchments

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