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Research article - Peer-reviewed, 2020

Decyl glucoside surfactant Triton CG-110 does not significantly affect the environmental fate of glyphosate in the soil at environmentally relevant concentrations

Carretta, Laura; Cardinali, Alessandra; Masin, Roberta; Zanin, Giuseppe; Cederlund, Harald

Abstract

Glyphosate is the most common herbicide worldwide, and its impact on the environment has increasingly been scrutinized. Glyphosate-based formulations can contain co-formulants, among which are surfactants. This study aimed to investigate whether the presence of an alkyl polyglucoside-based surfactant, Triton CG-110, affects the adsorption, leaching, and mineralisation of glyphosate in the soil. The experiments were conducted in two soils with different textures (sandy and clay) and in washed sand. Glyphosate and surfactant mixtures were applied at realistic field rates. Because of ponding and scarce leaching from the field soil, the leaching experiments were conducted only with washed sand. The results indicate a reduction of glyphosate adsorption in washed sand (from K-f = 13.5 to 3.99 mu g(1-1/n) (ml)(1/n) g(-1)) and in sandy soil (from K-f = 165 to 90.8 mu g(1-1/ n) (ml)(1/n) g(-1)) when using a Triton CG-110 concentration of 0.5 %, which corresponds to that of a spraying solution applied in the field, whereas adsorption in clay soil was unaffected. Triton CG-110 did not significantly affect glyphosate leaching in washed sand or mineralisation in any of the tested soils. The results indicate that Triton CG-110 is unlikely to significantly affect the environmental fate of glyphosate in the soil at environmentally relevant concentrations.

Keywords

Herbicide; Alkyl polyglucosides; Adsorption; Leaching; Mineralization

Published in

Journal of Hazardous Materials
2020, Volume: 388, article number: 122111

    Associated SLU-program

    SLU Plant Protection Network

    UKÄ Subject classification

    Soil Science
    Environmental Sciences
    Environmental Sciences related to Agriculture and Land-use

    Publication identifier

    DOI: https://doi.org/10.1016/j.jhazmat.2020.122111

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/103925