Photochemical behaviour of 4-chloro-2-methylphenoxyacetic acid

Zertal, Abdennour; Sehili, Tahar; Boule, Pierre

doi:10.1016/s1010-6030(01)00534-2

Cited by 59 publications

(34 citation statements)

References 23 publications

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“…Therefore, the phototransformation of MCPA can lead to toxic and potentially mutagenic secondary (and tertiary) pollutants in the environment. Field data are further supported by the laboratory finding that the intermediates of MCPA direct photolysis are more toxic than the parent compound (Zertal et al, 2001). …”

Section: Introductionmentioning

confidence: 79%

“…In contrast, in water bodies where the direct photolysis is comparable to the reaction with • OH, the effect of DOM on Φ MCPA could be critical to the photochemical fate of the herbicide. The direct photolysis intermediates of MCPA (including most notably 4-chloro-2-methylphenol; Zertal et al, 2001) are more toxic than the parent compound, while the reaction with • OH affords an at least partial depollution (Bojanowska-Czajka et al, 2007). Therefore, the inhibition of the direct photolysis by DOM could direct the phototransformation of MCPA toward less toxic intermediates.…”

Section: Discussionmentioning

confidence: 99%

“…MCPA absorbs UV radiation with a maximum around 280 nm, and the ability of both the anionic and the undissociated forms to absorb sunlight is quite limited. However, the low sunlight absorption is compensated for by the rather elevated quantum yield of direct photolysis, around 0.6 for the anionic form and 0.35 for the neutral one (Zertal et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The main intermediate that is produced upon direct photolysis of MCPA is 4-chloro-2-methylphenol (Zertal et al, 2001 and. The latter compound has been detected in the Rhône delta waters, where MCPA is extensively used as post-emergent herbicide in flooded rice farming.…”

Section: Introductionmentioning

confidence: 99%

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Effect of dissolved organic compounds on the photodegradation of the herbicide MCPA in aqueous solution

Vione

Khanra²,

Das³

et al. 2010

Water Research

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This works shows that the addition of phenol and 2-propanol as model organic compounds significantly decreases the direct photolysis quantum yield of 4-chloro-2-methylphenoxyacetic acid (MCPA) upon UVB irradiation in aqueous solution. Laser flash photolysis data suggest that 2-propanol is able to decrease the formation of the MCPA excited states under irradiation. A decrease from 0.54 to 0.34 of the photolysis quantum yield of the anionic form of MCPA (which prevails over the undissociated one in surface waters) could have a considerable impact on the MCPA lifetime in ecosystems where the direct photolysis is the main phototransformation pathway. In surface water bodies where the direct photolysis has comparable kinetics as the reaction with • OH, a decrease of the quantum yield would enhance the relative importance of the • OH pathway, which yields considerably less toxic intermediates than the direct photolysis.

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Section: Introductionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of dissolved organic compounds on the photodegradation of the herbicide MCPA in aqueous solution

Vione

Khanra²,

Das³

et al. 2010

Water Research

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“…), which can act as promoters of the chain reaction. In this way, Zertal et al (2001) report the significant role played by quinonic derivatives in MCPA photodegradation. These authors claim the occurrence of an auto-photocatalytic mechanism according to:…”

Section: Influence Of Free Hydroxyl Radicals Scavengersmentioning

confidence: 90%

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Rivas

Solís

Gimeno

et al. 2013

Int. J. Environ. Sci. Technol.

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An attempt to synthesize an active photocatalyst for 2-methyl-4-chlorophenoxyacetic acid removal has been accomplished. Black light (main emission wavelength at 365 nm) photocatalytic experiments with bare and N-doped titania have been carried out, and the results compared to those obtained in the presence of titania Degussa P-25. Doping percentage and calcination temperature influences have been investigated in photocatalytic runs using pure and commercial 2-methyl-4-chlorophenoxyacetic acid. In no case, the results obtained with synthesized titania improved the activity of P-25. Some kinetic tests allowed for the proposal of a pseudoempirical reaction mechanism capable of acceptably simulating the process in the presence of P-25. From the proposed mechanism, the roles played by hydroxyl, peroxyl and organic radicals have been suggested.

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Phototransformation Processes of Emerging Contaminants in Surface Water

Vione

Chirón

2014

Transformation Products of Emerging Contaminants in the Environment

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Photochemical behaviour of 4-chloro-2-methylphenoxyacetic acid

Cited by 59 publications

References 23 publications

Effect of dissolved organic compounds on the photodegradation of the herbicide MCPA in aqueous solution

Effect of dissolved organic compounds on the photodegradation of the herbicide MCPA in aqueous solution

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Phototransformation Processes of Emerging Contaminants in Surface Water

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