Photochemical behaviour of dichlorprop [(±)‐2‐(2,4‐dichlorophenoxy)propanoic acid] in aqueous solution

Meunier, Laurence; Gauvin, Emmanuelle; Boule, Pierre

doi:10.1002/ps.537

Cited by 10 publications

(7 citation statements)

References 16 publications

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“…The reported trend was also observed in other sampling sites (see Table 1). 4CP is a possible intermediate of the direct photolysis of DCP (Climent and Miranda 1997;Meunier et al 2002), a post-emergent herbicide used for rice crops in the delta (Comoretto et al 2007). The time evolution of DCP is also reported in Figure 2 and in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Laboratory and field evidence of the photonitration of 4-chlorophenol to 2-nitro-4-chlorophenol and of the associated bicarbonate effect

Maddigapu

Vione

Ravizzoli

et al. 2009

Environ Sci Pollut Res

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Section: Resultsmentioning

confidence: 99%

Laboratory and field evidence of the photonitration of 4-chlorophenol to 2-nitro-4-chlorophenol and of the associated bicarbonate effect

Maddigapu

Vione

Ravizzoli

et al. 2009

Environ Sci Pollut Res

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“…The direct photolysis of MCP in water was found to be rather low. 22,23 On this basis, one may expect that the photosensitizing reactions will contribute to the overall photodegradation process for a significant part.…”

Section: Introductionmentioning

confidence: 99%

Fulvic acid-mediated phototransformation of mecoprop. A pH-dependent reaction

Halladja¹,

Halle²,

Pilichowski³

et al. 2009

Photochem Photobiol Sci

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Elliott soil fulvic acid sensitized the phototransformation of mecoprop in aqueous medium. The reaction was selective, leading to the main formation of 4-chloro-2-methylphenol in aerated and in deoxygenated neutral solution. In turn, 4-chloro-2-methylphenol underwent a fulvic acid-mediated phototransformation. A pH decrease from 8 to 2.2 led to an increase of the rate of mecoprop loss by a factor of 10. The roles of hydroxyl radicals, fulvic triplets and singlet oxygen were investigated using the scavenging technique. At pH 6.5 where mecoprop was in the anionic form, triplet excited states and hydroxyl radicals were the main oxidant species contributing to 40 +/- 10% and 20 +/- 5% of the reaction, respectively. At pH 2.2 where mecoprop was protonated, fulvic triplets and hydroxyl radicals contributed to 75 +/- 10% and 16 +/- 5%, respectively. The enhancement of the reaction upon acidification might result from two phenomena tending to the same effect: (i) the capacity of protonated MCP to reach intra-humic microdomains and there interact with reactive species, and (ii) a greater photosensitizing property of FA in acidic medium.

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“…The distribution of photoproducts generated during the direct photolysis of dichlorprop is sensitive to oxygen concentrations, but does not vary with pH. 65,122,123 The observed photodegradation rates of dichlorprop increased in natural waters compared to pure water, demonstrating that the moderately persistent herbicide is susceptible to indirect photolysis. 121 Based on measured steady-state concentrations of cOH produced by photolysis of a lagoon water, 45% of the loss of dichlorprop was attributed to its reaction with cOH.…”

Section: Chlorophenoxyacid or Ester Herbicidesmentioning

confidence: 94%

The role of indirect photochemical degradation in the environmental fate of pesticides: a review

Remucal

2014

Environ. Sci.: Processes Impacts

190

141

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Photochemical degradation contributes to the environmental fate of many pesticides in surface waters. A better understanding of the role of direct and indirect photochemical degradation of pesticides is necessary in order to predict their environmental fate and persistence. This review includes all major pesticide classes and focuses on the importance of dissolved organic matter (DOM) as a sensitizer in indirect photodegradation within aquatic systems. Photochemical studies conducted under environmentally relevant conditions (i.e., aqueous solutions with irradiation wavelengths >290 nm) are included. Comparisons are made between observed photodegradation rates in pure or buffered water and in water containing DOM to assess the extent of pesticide susceptibility to DOM-sensitized indirect photolysis. When data is available, the role of specific reactive species in indirect photodegradation is described. While it is possible to assess the relative importance of direct and indirect photodegradation on a pesticide-by-pesticide basis in many cases, it is often difficult to make generalizations based on compound class. Knowledge gaps and inconstancies in the current body of literature are discussed and areas that require additional research are described.

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Photochemical behaviour of dichlorprop [(±)‐2‐(2,4‐dichlorophenoxy)propanoic acid] in aqueous solution

Cited by 10 publications

References 16 publications

Laboratory and field evidence of the photonitration of 4-chlorophenol to 2-nitro-4-chlorophenol and of the associated bicarbonate effect

Laboratory and field evidence of the photonitration of 4-chlorophenol to 2-nitro-4-chlorophenol and of the associated bicarbonate effect

Fulvic acid-mediated phototransformation of mecoprop. A pH-dependent reaction

The role of indirect photochemical degradation in the environmental fate of pesticides: a review

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