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New insights into the interactions between cork chemical components and pesticides. The contribution of π-π interactions, hydrogen bonding and hydrophobic effect

The role of chemical components of cork in the sorption of several pesticides has been investigated. For this purpose raw cork and three cork extracted fractions (i.e. cork free of aliphatic extractives, cork free of all extractives and cork free of all extractives and suberin) were used as sorbent of three ionic pesticides (propazine, 2,4-dichlorophenoxy acetic acid (2,4-D) and alachlor) and five non-ionic pesticides (chlor-pyrifos, isoproturon, metamitron, methomyl and oxamyl) with a logK(ow) within the range -0.47 to 4.92. The effect of cations on the ionic pesticides, propazine and 2,4-D sorption was also analyzed. Results indicated that the highest yields were obtained for chlorpyrifos and alachlor sorption onto raw cork (>55%). After removal of aliphatic extractives sorption of all pesticides increased that ranged from 3% for propazine to 31% for alachlor. In contrast, removal of phenolic extractives caused a sorption decrease. Low sorption yields were obtained for hydrophobic pesticides such as metamitron, oxamyl and methomyl (<11%) by using all cork fractions and extremely low when using raw cork (<1%). FTIR analysis was useful to indicate that lignin moieties were the main components involved on the sorption process. Modelling calculations evidenced that pi-stacking interactions with the aromatic groups of lignin play a major role in determining the adsorption properties of cork toward aromatic pesticides. Results presented in this paper gain insights into the cork affinities for pesticides and the interactions involved in the sorption process and also enables to envisage sorption affinity of cork for other organic pollutants

This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2012-37215-C02-01

© Chemosphere, 2015, vol. 119, p. 863-870

Elsevier

Author: Olivella Costa, Àngels
Bazzicalupi, C.
Bianchi, A.
Fiol Santaló, Núria
Villaescusa Gil, Isabel
Date: 2015 January
Abstract: The role of chemical components of cork in the sorption of several pesticides has been investigated. For this purpose raw cork and three cork extracted fractions (i.e. cork free of aliphatic extractives, cork free of all extractives and cork free of all extractives and suberin) were used as sorbent of three ionic pesticides (propazine, 2,4-dichlorophenoxy acetic acid (2,4-D) and alachlor) and five non-ionic pesticides (chlor-pyrifos, isoproturon, metamitron, methomyl and oxamyl) with a logK(ow) within the range -0.47 to 4.92. The effect of cations on the ionic pesticides, propazine and 2,4-D sorption was also analyzed. Results indicated that the highest yields were obtained for chlorpyrifos and alachlor sorption onto raw cork (>55%). After removal of aliphatic extractives sorption of all pesticides increased that ranged from 3% for propazine to 31% for alachlor. In contrast, removal of phenolic extractives caused a sorption decrease. Low sorption yields were obtained for hydrophobic pesticides such as metamitron, oxamyl and methomyl (<11%) by using all cork fractions and extremely low when using raw cork (<1%). FTIR analysis was useful to indicate that lignin moieties were the main components involved on the sorption process. Modelling calculations evidenced that pi-stacking interactions with the aromatic groups of lignin play a major role in determining the adsorption properties of cork toward aromatic pesticides. Results presented in this paper gain insights into the cork affinities for pesticides and the interactions involved in the sorption process and also enables to envisage sorption affinity of cork for other organic pollutants
This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2012-37215-C02-01
Format: application/pdf
ISSN: 0045-6535
Document access: http://hdl.handle.net/10256/10938
Language: eng
Publisher: Elsevier
Collection: MINECO/PN 2013-2015/CTM2012-37215-C02-01
MICINN/PN 2011-2013/CTM2010-15185
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.chemosphere.2014.08.051
Articles publicats (D-EQATA)
Is part of: © Chemosphere, 2015, vol. 119, p. 863-870
Rights: Tots els drets reservats
Subject: Plaguicides -- Absorció i adsorció
Pesticides -- Absorption and adsorption
Suro
Cork
Contaminants orgànics
Polluants organiques
Plaguicides -- Aspectes ambientals
Pesticides -- Environmental aspects
Title: New insights into the interactions between cork chemical components and pesticides. The contribution of π-π interactions, hydrogen bonding and hydrophobic effect
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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