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Nanoengineered Sorbents to Increase the Persistence of the Allelochemical Carvone in the Rhizosphere

AuthorsGámiz, B. ; Fracenda, G.; Celis, R.
Chiral pesticides
Soil amendments
Issue Date15-Jan-2019
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry 67(2): 589–596 (2019)
AbstractThis study investigates the changes in sorption/desorption, dissipation, and leaching of the two enantiomeric forms of the allelochemical carvone, R-carvone and S-carvone, after amending an agricultural soil sample with two nanoengineered sorbents: biochar (BC) and organoclay (OCl). The sorption of carvone enantiomers was nonenantioselective and similarly improved by the addition of OCl and BC to the soil. However, OCl-amended soil showed reversible sorption, whereas BC-amended soil displayed sorption-desorption hysteresis. Dissipation of carvone enantiomers was enantioselective. Both amendments increased the half-life of the enantiomers in the soil. This effect was more pronounced for BC-amended soil and for S-carvone. Leaching of R- and S-carvone through soil columns was scarce in unamended soil (<7%), due to their rapid degradation during leaching, and null for OCl- and BC-amended soil, for which much of the applied R- and S-carvone remained in the top 0-5 cm of the amended soil layer. Addition of biochars and organoclays could help increase the persistence of carvone enantiomers in the rhizosphere, which may favor their use as residual pest-management substances
Description8 páginas.-- 4 figuras.-- 2 tablas.--50 referencias.-- The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jafc.8b05692.
Publisher version (URL)http://dx.doi.org/10.1021/acs.jafc.8b05692
Appears in Collections:(IRNAS) Artículos
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