scholarly journals Photochemical Degradation of Organic Xenobiotics in Natural Waters

2018 ◽  
Author(s):  
Sarka Klementova
Keyword(s):  
Natural Waters ◽  
Photochemical Degradation ◽  
Organic Xenobiotics

Photochemical Degradation of Triazine and Anilide Pesticides in Natural Waters

2018 ◽  
pp. 137-148 ◽  
Author(s):  
F. H. Frimmel ◽  
D. P. Hessler
Keyword(s):  
Natural Waters ◽  
Photochemical Degradation

Photochemical degradation of nonylphenol and nonylphenol polyethoxylates in natural waters

Chemosphere ◽  
1994 ◽  
Vol 28 (7) ◽  
pp. 1361-1368 ◽  
Author(s):  
Marijan Ahel ◽  
Frank E. Scully ◽  
Jürg Hoigné ◽  
Walter Giger
Keyword(s):  
Natural Waters ◽  
Photochemical Degradation

scholarly journals Investigation of the Aquatic Photolytic and Photocatalytic Degradation of Citalopram

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5331
Author(s):  
Cristina Jiménez-Holgado ◽  
Paola Calza ◽  
Debora Fabbri ◽  
Federica Dal Bello ◽  
Claudio Medana ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Natural Waters ◽  
Vibrio Fischeri ◽  
Degradation Process ◽  
Transformation Products ◽  
Operating Conditions ◽  
Solar Irradiation ◽  
Photochemical Degradation ◽  
Indirect Photolysis ◽  
Water Constituents

This study investigated the direct and indirect photochemical degradation of citalopram (CIT), a selective serotonin reuptake inhibitor (SSRI), under natural and artificial solar radiation. Experiments were conducted in a variety of different operating conditions including Milli-Q (MQ) water and natural waters (lake water and municipal WWT effluent), as well as in the presence of natural water constituents (organic matter, nitrate and bicarbonate). Results showed that indirect photolysis can be an important degradation process in the aquatic environment since citalopram photo-transformation in the natural waters was accelerated in comparison to MQ water both under natural and simulated solar irradiation. In addition, to investigate the decontamination of water from citalopram, TiO2-mediated photocatalytic degradation was carried out and the attention was given to mineralization and toxicity evaluation together with the identification of by-products. The photocatalytic process gave rise to the formation of transformation products, and 11 of them were identified by HPLC-HRMS, whereas the complete mineralization was almost achieved after 5 h of irradiation. The assessment of toxicity of the treated solutions was performed by Microtox bioassay (Vibrio fischeri) and in silico tests showing that citalopram photo-transformation involved the formation of harmful compounds.

Photochemical Degradation of Marbofloxacin and Enrofloxacin in Natural Waters

2010 ◽  
Vol 44 (12) ◽  
pp. 4564-4569 ◽  
Author(s):  
Michela Sturini ◽  
Andrea Speltini ◽  
Federica Maraschi ◽  
Antonella Profumo ◽  
Luca Pretali ◽  
...  
Keyword(s):  
Natural Waters ◽  
Photochemical Degradation

scholarly journals Partial coupling and differential regulation of biologically and photochemically labile dissolved organic carbon across boreal aquatic networks

2014 ◽  
Vol 11 (20) ◽  
pp. 5969-5985 ◽  
Author(s):  
J.-F. Lapierre ◽  
P. A. del Giorgio
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Large Scale ◽  
Natural Waters ◽  
Boreal Lakes ◽  
Aquatic Environments ◽  
Photochemical Degradation ◽  
Landscape Gradients ◽  
Partial Coupling ◽  
Internal Production

Abstract. Despite the rapidly increasing volume of research on the biological and photochemical degradation of DOC (dissolved organic carbon) in aquatic environments, little is known of the large-scale patterns in biologically and photochemically degradable DOC (BDOC and PDOC, respectively) in continental watersheds, and on the links that exist between these two key properties that greatly influence the flow of carbon from continents to oceans. Here we explored the patterns in the concentrations and proportions of BDOC and PDOC across hundreds of boreal lakes, rivers and wetlands spanning a large range of system trophic status and terrestrial influence, and compared the drivers of these two reactive pools of DOC at the landscape level. Using standardized incubations of natural waters, we found that the concentrations of BDOC and PDOC covaried across all systems studied but were nevertheless related to different pools of dissolved organic matter (DOM; identified by fluorescence analyses) in ambient waters. Concentrations of nutrients and protein-like fluorescent DOM (FDOM) explained nearly half of the variation in BDOC, whereas PDOC was exclusively predicted by DOM optical properties, consistent with the photochemical degradability of specific FDOM pools that we experimentally determined. The concentrations of colored DOM (CDOM), which we use here as a proxy of terrestrial influence, almost entirely accounted for the observed relationship between FDOM and the concentrations of both BDOC and PDOC. The concentrations of CDOM and of the putative biolabile fluorescence component shifted from complete decoupling in clear-water environments to strong coupling in darker streams and wetlands. This suggests a baseline autochthonous BDOC pool fueled by internal production that is gradually overwhelmed by land-derived BDOC as terrestrial influence increases across landscape gradients. The importance of land as a major source of both biologically and photochemically degradable DOC for continental watersheds resulted in a partial coupling of those carbon pools in natural freshwaters, despite fundamental contrasts in terms of their composition and regulation.

Photochemical degradation study of irgarol 1051 in natural waters: influence of humic and fulvic substances on the reaction

2002 ◽  
Vol 147 (2) ◽  
pp. 135-141 ◽  
Author(s):  
Vasilios A Sakkas ◽  
Dimitra A Lambropoulou ◽  
Triantafyllos A Albanis
Keyword(s):  
Natural Waters ◽  
Photochemical Degradation ◽  
Degradation Study ◽  
Irgarol 1051

scholarly journals Partial coupling and differential regulation of biologically and photo-chemically labile dissolved organic carbon across boreal aquatic networks

2014 ◽  
Vol 11 (5) ◽  
pp. 6673-6714 ◽  
Author(s):  
J.-F. Lapierre ◽  
P. A. del Giorgio
Keyword(s):  
Large Scale ◽  
Natural Waters ◽  
Large Range ◽  
Boreal Lakes ◽  
Aquatic Environments ◽  
Photochemical Degradation ◽  
Clear Water ◽  
Landscape Gradients ◽  
Partial Coupling ◽  
Internal Production

Abstract. Despite the rapidly increasing volume of research on the biological and photochemical degradation of DOC in aquatic environments, little is known on the large-scale patterns in biologically and photo-chemically degradable DOC (Bd-DOC and Pd-DOC, respectively) in continental watersheds, and on the links that exist between these two key properties that greatly influence the flow of carbon from continents to oceans. Here we explore the patterns of Bd- and Pd-DOC across hundreds of boreal lakes, rivers and wetlands spanning a large range of system trophy and terrestrial influence, and compared the drivers of these two reactive pools of DOC at the landscape level. Using standardized incubations of natural waters, we found that the concentrations of Bd- and Pd-DOC co-varied across all systems studied but were nevertheless related to different pools of dissolved organic matter (DOM, identified by fluorescence analyses) in ambient waters. A combination of nutrients and protein-like DOM explained nearly half of the variation in Bd-DOC, whereas Pd-DOC was exclusively predicted by DOM optical properties, consistent with the photochemical degradability of specific fluorescent DOM (FDOM) pools that we experimentally determined. The concentrations of colored DOM (CDOM), a proxy of terrestrial influence, almost entirely accounted for the observed relationship between FDOM and the concentrations of both Bd- and Pd-DOC. The concentrations of CDOM and of the putative bio-labile fluorescence component shifted from complete decoupling in clear-water environments to strong coupling in browner streams and wetlands. This suggests a baseline autochthonous Bd-DOC pool fuelled by internal production that is gradually overwhelmed by land-derived Bd-DOC as terrestrial influence increases across landscape gradients. The importance of land as a major source of both biologically and photo-chemically degradable DOC for continental watersheds resulted in a partial coupling of those carbon pools in natural freshwaters, despite fundamental contrasts in terms of their composition and regulation.

The use of Permeation Liquid Membrane (PLM) as an analytical tool for trace metal speciation studies in natural waters

2003 ◽  
Vol 107 ◽  
pp. 1021-1024 ◽  
Author(s):  
N. Parthasarathy ◽  
M. Pelletier ◽  
J. Buffle
Keyword(s):  
Trace Metal ◽  
Natural Waters ◽  
Liquid Membrane ◽  
Metal Speciation ◽  
Analytical Tool ◽  
Trace Metal Speciation

Organic xenobiotics and methods for their determination in meat products

2020 ◽  
Vol 3 (1) ◽  
pp. 8-14
Author(s):  
N.N. Roeva ◽  
I.V. Glazkova ◽  
G.G. Abdrashitova ◽  
S.S. Voronich
Keyword(s):  
Meat Products ◽  
Organic Xenobiotics

The Malleable Excited States of Benzothiadiazole Dyes and Investigation of their Potential for Photochemical Control

2019 ◽  
Author(s):  
Caroline C. Warner ◽  
andrea thooft ◽  
Bryan J. Lampkin ◽  
selin demirci ◽  
Brett VanVeller
Keyword(s):  
Excited State ◽  
Excited States ◽  
Polar Solvent ◽  
Nonpolar Solvent ◽  
Photochemical Degradation ◽  
Solvent Lead ◽  
Environmentally Sensitive

<p>A strategy to control the efficiency of a photocleavage reaction based on changing the nature of the excited state is presented. A novel class of photoactive compounds has been synthesized by combining the classical o-nitrobenzyl scaffold with an environmentally sensitive dye, 4-amino-nitrobenzothiazole. Irradiation in a polar solvent lead to an excited state that is inoperative for photochemistry whereas excitation in a nonpolar solvent lead to an excited state that is photochemically active. A photochemical degradation appears to be the preferred process in contrast to the intended photocleavage process.</p>

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