Influence of formulation on triticonazole solubilisation and sorption in a soil-water system

Beigel, C.; Barriuso, Enrique

doi:10.1002/(sici)1526-4998(200003)56:3<271::aid-ps134>3.0.co;2-2

Cited by 5 publications

(6 citation statements)

References 17 publications

(21 reference statements)

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“…These effects were consistent across all time intervals studied. Whilst we have not investigated the mechanisms underpinning this finding, it is likely that the surfactants within the Kerb® Flo formulation remained associated with the active substance, keeping a greater proportion in soil solution and acting to retard extent of sorption to soil and thus to exacerbate leaching ( Beigel and Barriuso, 2000;Oukali-Haouchine et al, 2013). The findings are consistent with the literature whereby propyzamide is found reasonably frequently in water quality monitoring studies despite the relatively strong sorption to soil constitutents within the literature.…”

Section: Discussionsupporting

confidence: 75%

“…Yet, there are conflicting results even for this highly standardised and unrealistic test system. Beigel and Barriuso (2000) and Oukali-Haouchine et al (2013) suggested that co-formulants may favour maintaining pesticide molecules in solution, thus weakening sorption relative to that of the technical pesticide material. It has also been suggested that slow separation of the pesticide molecule from the surrounding co-formulants within soil may slow the rate of sorption processes relative to technical material (Pose-Juan et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Influence of commercial formulation on the sorption and leaching behaviour of propyzamide in soil

Khan

Brown

2017

Science of The Total Environment

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Experiments compared sorption and leaching behaviour for the herbicide propyzamide when applied to two soils either as technical material or in the commercial formulation Kerb® Flo. Sorption was investigated in batch systems as well as using a centrifugation technique to investigate changes in pesticide concentration in soil pore water over incubation periods of up to 28days. Studies with small soil columns compared leaching of technical and formulated pesticide for irrigation events (6 pore volumes) 1, 7, 14, 21 and 28days after treatment. There were no differences in sorption of technical and formulated propyzamide when measured by batch systems. Sorption of technical material was significantly greater than that of formulated pesticide in sandy loam (p<0.05), but not in sandy silt loam when measured by centrifugation of soil incubated at field capacity. Partition coefficients measured by batch and centrifugation methods were similar after 1day and those measured by centrifugation increased by factors of 5.3 to 7.5 over the next 4weeks. The mass of propyzamide leached from soil columns ranged between 1.1±0.33% and 14.4±3.2% of the applied amount. For all time intervals and in both soils, the mass of propyzamide leached was significantly greater (two-sided t-tests, p<0.001) for the formulated product than for the technical material. Leached losses decreased consistently with time in the sandy loam soil (losses after 28days were 14-17% of those after 1day), but with less consistency in the sandy silt loam. There was a highly significant effect of formulation on the leaching of propyzamide through soil (two-way ANOVA, p<0.001) as well as highly significant effects of time and soil type (p<0.001). Results are consistent with modelling studies where leaching from commercial products in the field could only be simulated by reducing sorption coefficients relative to those measured with technical material in the laboratory.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Influence of commercial formulation on the sorption and leaching behaviour of propyzamide in soil

Khan

Brown

2017

Science of The Total Environment

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“…Other studies have explored the effects of formulation on pesticide behavior. In studies with chlorsulfuron, coformulants reduced sorption (Foldenyi et al ); studies with propyzamide (Khan and Brown ) showed sorption to increase; and studies with triticonazole, cyprodinil, propetamphos, and fludioxinil showed sorption to increase (Beigel et al ; Beigel and Barriuso ; Garcia‐Ortega et al ; Pose‐Juan et al ). The impacts of coformulants therefore likely depend on the a.i.…”

Section: Resultsmentioning

confidence: 99%

Fate, uptake, and distribution of nanoencapsulated pesticides in soil–earthworm systems and implications for environmental risk assessment

Firdaus

Agatz

Hodson

et al. 2018

Enviro Toxic and Chemistry

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Nanopesticides are novel plant protection products offering numerous benefits. Because nanoparticles behave differently from dissolved chemicals, the environmental risks of these materials could differ from conventional pesticides. We used soil-earthworm systems to compare the fate and uptake of analytical-grade bifenthrin to that of bifenthrin in traditional and nanoencapsulated formulations. Apparent sorption coefficients for bifenthrin were up to 3.8 times lower in the nano treatments than in the non-nano treatments, whereas dissipation half-lives of the nano treatments were up to 2 times longer. Earthworms in the nano treatments accumulated approximately 50% more bifenthrin than those in the non-nano treatments. In the non-nano treatments, most of the accumulated material was found in the earthworm tissue, whereas in the nano treatments, the majority resided in the gut. Evaluation of toxicokinetic modeling approaches showed that models incorporating the release rate of bifenthrin from the nanocapsule and distribution within the earthworm provided the best estimations of uptake from the nano-formulations. Overall, our findings indicate that the risks of nanopesticides may be different from those of conventional formulations. The modeling presented provides a starting point for assessing risks of these materials but needs to be further developed to better consider the behavior of the nanoencapsulated pesticide within the gut system. Environ Toxicol Chem 2018;37:1420-1429. © 2018 SETAC.

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“…A few recent studies have investigated formulation types other than controlledrelease, undertaking batch experiments that compare sorption of pesticides in soil slurry systems when added as pure substances or as commercial formulations (e.g. Beigel & Barriuso, 2000;Pose-Juan et al, 2010;Földényi et al, 2013). We have shown that such experiments will not always capture formulation effects and proposed that a centrifugation methodology provides a better measure of any influence of formulation under natural soil conditions (Khan & Brown, this issue).…”

Section: Introductionmentioning

confidence: 99%

Influence of commercial formulation on leaching of four pesticides through soil

Khan

Brown

2016

Science of The Total Environment

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Influence of formulation on triticonazole solubilisation and sorption in a soil-water system

Cited by 5 publications

References 17 publications

Influence of commercial formulation on the sorption and leaching behaviour of propyzamide in soil

Influence of commercial formulation on the sorption and leaching behaviour of propyzamide in soil

Fate, uptake, and distribution of nanoencapsulated pesticides in soil–earthworm systems and implications for environmental risk assessment

Influence of commercial formulation on leaching of four pesticides through soil

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