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Effect of formulation and repeated applications on the enantioselectivity of metalaxyl dissipation and leaching in soil

Otros títulosEnantioselective behavior of metalaxyl in soil under repeated applications
AutorCelis, R. ; Gámiz, B. ; Adelino, M. A. ; Cornejo, J. ; Hermosín, M.C.
Palabras claveChiral pesticides
Layered double hydroxides
Fecha de publicación1-oct-2015
EditorSociety of Chemical Industry
John Wiley & Sons
CitaciónPest Management Science (71)11: 1572-1581 (2015)
ResumenBACKGROUND: Soil incubation and column leaching experiments were conducted to address the question of whether the type of formulation (unsupported versus clay supported) and repeated applications of the chiral fungicide (RS)-metalaxyl affected the enantioselectivity of its dissipation and leaching in a slightly alkaline, loamy sand agricultural soil. RESULTS: Regardless of the type of formulation and the number of fungicide applications, the R-enantiomer of metalaxyl was degraded faster than the S-enantiomer, but the individual degradation rates of R- and S-metalaxyl were highly affected by the different application regimes assayed (t1/2 = 2-104 days). Repeated applications accelerated the degradation of the biologically active R-metalaxyl enantiomer, whereas they led to slower degradation of the non-active S-metalaxyl enantiomer. The type of formulation had less influence on the dissipation rates of the enantiomers. For all formulations tested, soil column leachates became increasingly enriched in S-enantiomer as the number of fungicide applications was increased, and application of metalaxyl to soil columns as clay-based formulations reduced the leaching of both enantiomers. CONCLUSION: Pesticide application conditions can greatly influence the enantioselective dissipation of chiral pesticides in soil, and hence are expected to exert a great impact on both the biological efficacy and the environmental chiral signatures of pesticides applied as mixtures of enantiomers or racemates to agricultural soils. © 2015 Society of Chemical Industry.
Descripción10 páginas.-- 5 imágenes.-- 2 tablas.-- 52 referencias
Versión del editorhttp:// dx.doi.org/10.1002/ps.3963
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