Sorption of low levels of nonionic and anionic surfactants on soil: effects on sorption of triticonazole fungicide

Abstract

: The sorption of two anionic surfactants and a series of seven nonionic alkylphenolethoxylate surfactants of increasing hydrophilic/lipophilic balance (HLB) in a loamy clay soil was evaluated. The e †ect of low doses of these surfactants on the sorption characteristics of the fungicide triticonazole was investigated. The critical micellar concentration (CMC) of the surfactants in pure water and soilÈwater systems, and surfactant sorption were estimated by surface tension measurements using a batch equilibration technique. Triticonazole sorption, alone and in the presence of low doses of surfactants, was also measured by batch equilibration. CMC of the alkylphenol surfactants increased with their HLB. The sorption of surfactants increased with their lipophilicity. CMC in the soilÈwater systems were considerably higher than in pure water. Sorption of the most lipophilic alkylphenol surfactants at the higher doses signiÐcantly increased triticonazole sorption. Proposed mechanisms are modiÐcations of soil surface properties, and increase of soil organic carbon content. Sorption of the other nonionic and anionic surfactants only resulted in monomeric surfactant concentrations in pore water, and did not a †ect triticonazole sorption.1998 Society ( of Chemical Industry Pestic. Sci., 54, 52È60 (1998)

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

“…This was because secondary aggregates began to form in the solution, and as the secondary aggregates adsorbed onto the soil matrix, the adsorption capacity increased further. This result was consistent with a previous study [39], where they observed that at low concentrations, surfactants are not likely to increase contaminant partitioning into the soil phase. However, the soilwater partition coefficient of the contaminant increased at higher nonionic surfactant doses.…”

Surfactant–soil interactions during surfactant-amended remediation of contaminated soils by hydrophobic organic compounds: A review

“…Chappell et al (2005) concluded that partitioning of the pesticide atrazine into soil-sorbed surfactant may lead to enhanced atrazine sorption by soil (Chappell et al, 2005). However, Beigel et al (1998) observed that at the low concentrations employed in most pesticide formulations, surfactants are not likely to increase pesticide partitioning to soil phase. The soil-water partition coefficient of the pesticide did, however, increase at higher nonionic surfactant doses (Beigel et al, 1998).…”

“…However, Beigel et al (1998) observed that at the low concentrations employed in most pesticide formulations, surfactants are not likely to increase pesticide partitioning to soil phase. The soil-water partition coefficient of the pesticide did, however, increase at higher nonionic surfactant doses (Beigel et al, 1998).…”

Biosurfactantes y su papel en la biorremediación de suelos contaminados con plaguicidas

“…Iglesias-Jiménez et al (1996) publicaron datos referente a la adsorción de plaguicidas en sistemas suelo-agua en presencia de los surfactantes Tween 80 y Tetradecil trimetil amonio bromuro sobre los plaguicidas diazinon, acefato, atrazina y etofumesate. Otro informe similar fue publicado por Beigel et al (1998) sobre la desorción que presenta un suelo sometido a concentraciones bajas de surfactantes aniónicos y no iónicos en presencia del fungicida triconazol. Así mismo Jayashree et al (2006), desarrollaron trabajos de investigación sobre el mejoramiento de suelos contaminados con el endosulfán, con la ayuda de los surfactantes Tween 80, Triton X -100 y surfactin.…”