Effect of fulvic acid on the photochemical degradation of methylparathion

Manzanilla‐Cano, José A.; Barceló‐Quintal, Manuel H.; Alcocer-Can, Ligia Del C.; Coral-Martínez, Tania Isolina

doi:10.1080/03601231003704549

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…162,216 Sensitized photolysis of parathion methyl in the presence of DOM from river water, compost fulvic acids and Aldrich humic acids has been reported, but direct photolysis controls were not included. 199,231,232 H 2 O 2 photolysis could also contribute to the sensitized photodegradation of parathion methyl under environmentally relevant conditions. 69 Parathion methyl reacts relatively slowly with CO 3 À c. 226 Parathion, also commonly referred to as parathion ethyl, is susceptible to direct photolysis.…”

Section: Organophosphate Insecticidesmentioning

confidence: 99%

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

Remucal

2014

Environ. Sci.: Processes Impacts

188

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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Section: Organophosphate Insecticidesmentioning

confidence: 99%

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

Remucal

2014

Environ. Sci.: Processes Impacts

188

141

View full text Add to dashboard Cite

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Behaviour of ionic herbicides in different forestry soils derived from volcanic ash

Alister,

Becerra,

Vega

et al. 2024

NZJFS

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Background: Weed control has been one of the most significant factors in forest establishment practices that can improve biomass production, and herbicides represent the most effective and convenient way to control weeds. The environmental concern about herbicides in this industry is because the herbicide-treated area is often located near water reservoirs or areas where rivers and creeks originate. This study aimed to determine the adsorption and degradation behaviours of seven ionic herbicides used in forestry production in five Chilean forestry soils and their relation to the leaching and to generate information to validate environmental predictive models. Methods: Adsorption and degradation of ionisable herbicides such as simazine, terbuthylazine, hexazinone, metsulfuron-methyl, indaziflam, flazasulfuron and glyphosate were studied in Andisol, Ultisol, Inceptisol, Entisol and Alfisol forestry soils, to be related to their leaching in 100-cm high and 11-cm diameter soil disturbed lysimeters. Herbicides were quantified using high-pressure liquid chromatography and gas chromatography. Relationships between soil physicochemical properties, herbicide adsorption and degradation, and herbicide leaching were determined. Results: In decreasing order, the herbicides were mobile in Entisol>Alfisol>Ultisol>Inceptisol>Andisol soils. On the other hand, the more leachable herbicides, from high to low, were: hexazinone, metsulfuron-methyl, simazine, glyphosate, terbuthylazine, flazasulfuron and indaziflam. The last two herbicides were not detected below 60 cm soil depth. In general, the maximum soil depth herbicide reached and the percentage mass leached up to 90 cm soil depth were inversely related to soil adsorption (1/Kd), soil porosity, humidity, silt, aluminium, and calcium soil content. Herbicide degradations were generally faster than referential published values. Conclusions: The environmental coefficients of ionic herbicides were more related to soil properties than their physicochemical properties. Persistence of herbicides in soil was smaller than that commonly reported in other studies or international databases and soil adsorption averages were generally higher than international reference values. The stronger relationship between ionic herbicide behaviour and forestry soil properties endorses the requirement to determine the environmental herbicides parameters in situ, avoiding using parameters estimated in other soils.

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Effect of fulvic acid on the photochemical degradation of methylparathion

Cited by 2 publications

References 19 publications

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

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

Behaviour of ionic herbicides in different forestry soils derived from volcanic ash

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