Nitrate-induced photodegradation of atenolol in aqueous solution: Kinetics, toxicity and degradation pathways

Autor: Xi Yang, Corinne Ferronato, Yuefei Ji, Chao Zeng, Jean-Marc Chovelon
Přispěvatelé: EAU (EAU), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), AIR:EAU+CFE
Rok vydání: 2012
Předmět:
Environmental Engineering
Health
Toxicology and Mutagenesis

Bicarbonate
Radical
Kinetics
0207 environmental engineering
02 engineering and technology
010501 environmental sciences
Photochemistry
01 natural sciences
chemistry.chemical_compound
Reaction rate constant
Nitrate
Toxicity Tests
Animals
Environmental Chemistry
020701 environmental engineering
Photodegradation
Humic Substances
0105 earth and related environmental sciences
Minerals
Nitrates
Photolysis
Aqueous solution
Public Health
Environmental and Occupational Health

Water
[CHIM.CATA]Chemical Sciences/Catalysis
General Medicine
General Chemistry
Hydrogen-Ion Concentration
[SDE.ES]Environmental Sciences/Environmental and Society
Pollution
6. Clean water
Solutions
Bicarbonates
Atenolol
Daphnia
chemistry
13. Climate action
Sunlight
Environmental Pollutants
Hydroxyl radical
Zdroj: Chemosphere
Chemosphere, Elsevier, 2012, 88, pp.644-649. ⟨10.1016/j.chemosphere.2012.03.050⟩
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2012.03.050
Popis: AIR:EAU+YJI:CFE:JMC:SYA; The extensive utilization of beta-blockers worldwide led to frequent detection in natural water. In this study the photolysis behavior of atenolol (ATL) and toxicity of its photodegradation products were investigated in the presence of nitrate ions. The results showed that ATL photodegradation followed pseudo-first-order kinetics upon simulated solar irradiation. The photodegradation was found to be dependent on nitrate concentration and increasing the nitrate from 0.5 mM L-1 to 10 mM L-1 led to the enhancement of rate constant from 0.00101 min(-1) to 0.00716 min(-1). Hydroxyl radical was determined to play a key role in the photolysis process by using isopropanol as molecular probe. Increasing the solution pH from 4.8 to 10.4, the photodegradation rate slightly decreased from 0.00246 min(-1) to 0.00195 min(-1), probably due to pH-dependent effect of nitrate-induced (OH)-O-center dot formation. Bicarbonate decreased the photodegradation of ATL in the presence of nitrate ions mainly through pH effect, while humic substance inhibited the photodegradation via both attenuating light and competing radicals. Upon irradiation for 240 min, only 10% reduction of total organic carbon (TOC) can be achieved in spite of 72% transformation rate of ATL, implying a majority of ATL transformed into intermediate products rather than complete mineralization. The main photoproducts of ATL were identified by using solid phase extraction-liquid chromatography-mass spectrometry (SPE-LC-MS) techniques and possible nitrate-induced photodegradation pathways were proposed. The toxicity of the phototransformation products was evaluated using aquatic species Daphnia magna, and the results revealed that photodegradation was an effective mechanism for ATL toxicity reduction in natural waters. (C) 2012 Elsevier Ltd. All rights reserved.
Databáze: OpenAIRE