Photodegradation of Pesticides on Plant and Soil Surfaces

Katagi, Toshiyuki

doi:10.1007/978-1-4419-9098-3_1

Cited by 166 publications

(192 citation statements)

References 514 publications

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“…Studies on the photochemical oxidation of xenobiotic organic carbon (herbicides, insecticides and pesticides) in agricultural soils suggested that 1 O 2 generated by sunlight via the photosensitization of soil organics (and possibly of Ti-and Zn-oxides) to be the main oxidant 5 . The involvement of other reactive oxygen species (ROSs) such as superoxide (O 2 Á À ) and hydroxy ( Á OH) radical has been hypothesized as well [6][7][8][9][10][11] . OH is postulated to result indirectly from the reaction of water with humic substances in the excited triplet state or from degradation of H 2 O 2 by transition metal (Me tr ) cations such as Fe 3 þ via a photo-Fenton reaction 10 .…”

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confidence: 99%

Evidence for photochemical production of reactive oxygen species in desert soils

et al. 2015

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The combination of intense solar radiation and soil desiccation creates a short circuit in the biogeochemical carbon cycle, where soils release significant amounts of CO 2 and reactive nitrogen oxides by abiotic oxidation. Here we show that desert soils accumulate metal superoxides and peroxides at higher levels than non-desert soils. We also show the photogeneration of equimolar superoxide and hydroxyl radical in desiccated and aqueous soils, respectively, by a photo-induced electron transfer mechanism supported by their mineralogical composition. Reactivity of desert soils is further supported by the generation of hydroxyl radical via aqueous extracts in the dark. Our findings extend to desert soils the photogeneration of reactive oxygen species by certain mineral oxides and also explain previous studies on desert soil organic oxidant chemistry and microbiology. Similar processes driven by ultraviolet radiation may be operating in the surface soils on Mars.

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confidence: 99%

Evidence for photochemical production of reactive oxygen species in desert soils

et al. 2015

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“…For example, Willis and McDowell [24] created a data set of dissipation rates for 79 different pesticide substances on plant leaves in 1987, Katagi [25] reported data for 65 pesticides on a variety of matrices in 2004 and, Fantke and Juraske [15] collated a much larger data set of 346 pesticides, again on a range of plant matrices using 811 published studies in 2013. All of these data sets, particularly the latter one, have been hugely valuable to the risk assessment community but the value of these data, and indeed other risk assessment data, is timelimited.…”

Section: Discussionmentioning

confidence: 99%

Development of a Data Set of Pesticide Dissipation Rates in/on Various Plant Matrices for the Pesticide Properties Database (PPDB)

Lewis¹,

Tzilivakis²

2017

Preprint

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Data relating to the rate at which pesticide active substances dissipate on or within various plant matrices are important for a range of different risk assessments however, despite the importance of this data, dissipation rates are not included in the most common online data resources. Databases have been collated in the past but these tend not to be maintained or regularly updated. The purpose of the exercise described herein was to collate a new database in a format compatible with the main online pesticide database resource (the Pesticide Properties Database, PPDB), to validate this database in line with the Pesticide Properties Database protocols and thus ensure that the data is maintained and updated in future. Data was collated using a systematic review approach using several scientific databases. Collated literature was subjected to a quality assessment and then data was extracted into an MS Excel spreadsheet. The outcome of the study is a database based on data collated from 1390 published articles covering over 400 pesticides and over 200 crops across a wide variety of different matrices (leaves, fruits, seeds etc.) for pesticide residues on the crop surface as well as residues absorbed within the plant material. This data is now fully incorporated into the PPDB.Data Set: available as a supplementary file: 'Plant dissipation data August 2017.xlxs'. Data Set License: This data set was made available under a CC-BY licenseKeywords: pesticide dissipation; risk assessment; environmental fate SummaryData relating to the rate at which pesticide active substances dissipate or decay on or within various plant matrices (e.g. leaves, stems, seeds, fruits) are important for a range of different risk assessments. For example, dissipation rates can be used to determine when workers can safely reenter fields and glasshouses following a pesticide application [1] and may also be used to estimate the potential exposure of individuals who may come in contact with, for example, sprayed sports turf or golf greens [2,3]. Dissipation rates also have application in consumer safety. For example, these values are used in calculations for predicting residue concentrations in harvested produce and for determining the time interval needed between crop spraying and harvesting or potential processing/consumption in order to minimise residue concentrations [4][5]. Dissipation rates also have value when considering the potential risk to non-target and beneficial organisms (e.g. pollinators) that may forage or otherwise come in contact with a pesticide treated plant as well as informing on how long the chemical is likely to offer satisfactory pest control before it decays [6][7][8]. As a consequence plant matrix half-lives are often an important input parameter into various risk assessment models [9][10][11][12].In this context dissipation rate is defined as the rate at which the pesticide active substance disappears from the part of the plant measured due to the combined effects of different processes including volatilisatio...

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“…It may occur in surface waters, in soil, in the atmosphere and on the leaf surface. Ultraviolet radiation (UV) reaching the earth's surface is the most important factor that can affect herbicide photodecomposition (Katagi, 2004). This can be biologically harmful, but on the other hand, decomposition of environmental pollutants, including herbicides, has a positive effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of Simulated Radiation on Sethoxydim Performance Used with and without Vegetable Oils

Hammami

Mohassel

Parsa³

et al. 2014

Not Sci Biol

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The photodecomposition of post emergence herbicides on leaf surface can be affected via adding vegetable oils to spray tank. Nine vegetable oils were compared to assess the photodecomposition of sethoxydim on wild oat leaf surface under simulated light conditions. The experiment was conducted as completely randomized factorial design with three replications at the College of Agriculture, Ferdowsi University of Mashhad, Iran, in 2013. Each herbicidal solution (with and without vegetable oil) was exposed to simulated light at 0, 5, 10, 20, 30, 60, 120 and 240 MAS (min after spray), for 30 min. The performance of sethoxydim in the presence of turnip, olive, soybean, corn, sunflower, canola, sesame, castor and cotton seed oils, compared to non-vegetable oil solution, increased up to 4.02-, 3.44-, 3.22-, 3.08-, 2.86-, 2.09-, 1.96-, 1.77-and 1.25-fold. All vegetable oils significantly improved the resistance of sethoxydim to light treatment. The effect of vegetable oils on the resistance to photodecomposition of sethoxydim was significant different at less than 60 MAS, while no significant differences were noted among vegetable oils when light treatment occurred at 120 and 240 MAS. Data from the light treatments have confirmed that when vegetable oils were added to sethoxydim, light adverse effect was lower, which is presumably due to disturbance of the cuticule and the rapid absorption of sethoxydim by wild oat leaves. Vegetable oils fatty acids composition effect the resistance to photodecomposition of sethoxydim, as with increasing the unsaturated fatty acid values, the resistance to photodecomposition was improved.

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Photodegradation of Pesticides on Plant and Soil Surfaces

Cited by 166 publications

References 514 publications

Evidence for photochemical production of reactive oxygen species in desert soils

Evidence for photochemical production of reactive oxygen species in desert soils

Development of a Data Set of Pesticide Dissipation Rates in/on Various Plant Matrices for the Pesticide Properties Database (PPDB)

Effect of Simulated Radiation on Sethoxydim Performance Used with and without Vegetable Oils

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