Chlorpyrifos-methyl solubilisation by humic acids used as bio-surfactants extracted from lignocelluloses and kitchen wastes. (September 2016)

• Record Type: Journal Article
• Authors: Scaglia, Barbara; Baglieri, Andrea; Tambone, Fulvia; Gennari, Mara; Adani, Fabrizio
• Is Part Of: Chemosphere. Volume 159(2016)
• Page Start: 208
• Page End: 213
• Publication Date: 2016-09
• Subjects: Biosurfactant -- Chlorpyrifos-methyl -- Humic acid -- Organic waste -- SDS; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2016.06.008
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Chlorpyrifos-methyl (CLP-m) is a widely used organophosphate insecticide that can accumulate in soil and become toxic to humans. CLP-m can be removed from soil by its solubilisation using synthetic surfactants. However, synthetic surfactants can accumulate in soil causing contamination phenomena themselves. Bio-surfactants can be used as an alternative to synthetic ones, reducing costs and environmental issues. In this work, humic acid (HA) extracted from raw biomasses, i.e. lignocelluloses (HAL ) and lignocelluloses plus kitchen food waste (HALF ), corresponding composts (C) (HALC and HALFC ) and leonardite (HAc), were tested in comparison with commercial surfactants, i.e. SDS, Tween 20 and DHAB, to solubilize CLP-m. Results obtained indicated that only biomass-derived HA, composted biomass-derived HA, and SDS solubilized CLP-m: SDS = 0.006; HAL = 0.007; HALC = 0.009 g; HALF = 0.025; HALFC = 0.024) (g CLP-m g −1 surfactant). Lignocelluloses HAs (HAL, HALF ) solubilized CLP-m just as well as SDS while lignocellulosic plus kitchen food waste HA (HALF, HALFC ) showed a three times higher CLP-m solubilisation capability. This difference was attributed to the higher concentration of alkyl-Carbon that creates strong links with CLP-m in the hydrophobic micelle-core of the surfactants. Graphical abstract: Highlights: The insecticide Chlorpyrifos-methyl (CLP-m) accumulates in soil becoming toxic. CLP-m can be removed from soil by its solubilisation using synthetic surfactants. Humic acid (HA) from biomasses solubilized CLP-m as well as synthetic ones. HA from kitchen waste showed highest CLP-m solubilisation capability. HA alkyl-C fraction amount and composition affected CLP-m solubilisation.