Modeling of Indirect Phototransformation Reactions in Surface Waters

Vione, Davide; Das, Rajesh; Rubertelli, Francesca; Maurino, Valter; Minero, Claudio

doi:10.1002/9783527630554.ch10

Cited by 6 publications

(6 citation statements)

References 110 publications

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“…The numerical values in equation (6) are the rate constants for the reaction between • OH and carbonate, bicarbonate, DOM and nitrite [22]. Usually DOM is by far the main sink for • OH in surface freshwaters [10].…”

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

“…The absorption spectra of the relevant surface water samples are reported in Figure 1. The error bounds of the values in Table 1 are referred to those of R •OH tot as derived from the model reported in [22], modified according to the rules of error propagation. It is possible to model the absorption spectrum of the Greifensee water by means of equation (5) and the reported NPOC value.…”

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

“…Another input datum for R •OH tot would be the absorption spectrum A 1 (λ) of the water over the optical path length b = 1 cm. However, in case the spectrum is not available it would be possible to approximately model it from the NPOC value, as [22]:…”

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

“…The main issue with reaction (4) [22], and d is the water column depth best expressed as the average depth of the water body. All the calculations will be referred to the standard volume V (in litres), but it would be the same as referring them to the whole aquatic system.…”

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

“…Table 1 reports the values of the chemical composition and those of R •OH tot and R CO3-•(•OH) for the case of four lakes and one river. The chemical composition is referred to the surface water layer because the photochemical reactions mostly occur within the first meter of the water column [21,22]. The water absorption spectrum was not available for the river, and it was simulated according to equation (5).…”

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

See 4 more Smart Citations

Modelling the occurrence and reactivity of the carbonate radical in surface freshwater

Vione

Maurino

Minero

et al. 2009

Comptes Rendus. Chimie

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A model was developed to foresee the degradation kinetics of dissolved compounds for reaction with the carbonate radical in surface waters. It would contribute to the assessment of the environmental persistence of pollutants, therefore allowing a better definition of the exposure of natural ecosystems and human communities to hazardous substances. The model is a function of the water chemical composition, the water column depth, and the second-order rate constant of the reaction between the relevant compound and the carbonate radical. A comparison between the reactivity of the carbonate and the hydroxyl radical shows that the latter would often play a more important role as reactive species, but the carbonate radical could prevail in carbonate-rich waters toward the degradation of easily oxidisable molecules.

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Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

Section: The Model For Carbonate Radicals In Surface Watersmentioning

confidence: 99%

See 3 more Smart Citations

Modelling the occurrence and reactivity of the carbonate radical in surface freshwater

Vione

Maurino

Minero

et al. 2009

Comptes Rendus. Chimie

Self Cite

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Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Muszyński

Brodowska

Paszko

2019

Environ Sci Pollut Res

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The article presents the behavior of phenoxy acids in water, the levels in aquatic ecosystems, and their transformations in the water environment. Phenoxy acids are highly soluble in water and weakly absorbed in soil. These highly mobile compounds are readily transported to surface and groundwater. Monitoring studies conducted in Europe and in other parts of the world indicate that the predominant phenoxy acids in the aquatic environment are mecoprop, 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorprop, 2,4-dichlorophenoxyacetic acid (2,4-D), and their metabolites which are chlorophenol derivatives. In water, the concentrations of phenoxy acids are effectively lowered by hydrolysis, biodegradation, and photodegradation, and a key role is played by microbial decomposition. This process is determined by the qualitative and quantitative composition of microorganisms, oxygen levels in water, and the properties and concentrations of phenoxy acids. In shallow and highly insolated waters, phenoxy acids can be decomposed mainly by photodegradation whose efficiency is determined by the form of the degraded compound. Numerous studies are underway on the use of advanced oxidation processes (AOPs) to remove phenoxy acids. The efficiency of phenoxy acid degradation using AOPs varies depending on the choice of oxidizing system and the conditions optimizing the oxidation process. Most often, methods combining UV radiation with other reagents are used to oxidize phenoxy acids. It has been found that this solution is more effective compared with the oxidation process carried out using only UV.

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Dissolved organic matter isolates obtained by solid phase extraction exhibit higher absorption and lower photo-reactivity: Effect of components

Du,

Wen,

Huang

et al. 2024

Water Research

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Modeling of Indirect Phototransformation Reactions in Surface Waters

Cited by 6 publications

References 110 publications

Modelling the occurrence and reactivity of the carbonate radical in surface freshwater

Modelling the occurrence and reactivity of the carbonate radical in surface freshwater

Occurrence and transformation of phenoxy acids in aquatic environment and photochemical methods of their removal: a review

Dissolved organic matter isolates obtained by solid phase extraction exhibit higher absorption and lower photo-reactivity: Effect of components

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