Please use this identifier to cite or link to this item:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Effect of the nature of exogenous organic matter on pesticide sorption by the soil

AuthorsIglesias Jiménez, Emeterio CSIC; Poveda, E.; Sánchez Martín, M. Jesús CSIC ORCID ; Sánchez Camazano, M.
Keywordshumic acids
exogenous organic matter
humic acids
hydrophobic pesticides-humic acid interaction
wershaw's micellar model
Soil contamination
Soil decontamination
Environmental pollution
Soil Science
Issue Date1997
CitationArch. Environ. Contam. Toxicol. 33 (1997), 117-124
AbstractA study was carried out on the sorption of two sparingly water-soluble pesticides (diazinon and linuron) by a sandy loam soil modified with different exogenous organic materials (EOMs) containing humic like substances: city refuse compost (CRC), peat (P), commercial humic acid (HA), liquid humic acid (LHA) extracted from leonardite and two (non humic) model compounds (surfactants): tetradecyltrimethylammonium bromide (TDTMA) and sodium dodecyl sulphate (SDS) before and after 2 and 8 months incubation periods with the soil. In all cases, the isotherms fitted the Freundlich sorption equation (x/m=KCen), generally with r2 values greater than 0.99. The value of the sorption constant K for the natural soil was 8.81 for diazinon and 2.29 for linuron. These values increased significantly for EOM modified soils with respect to natural soil, with the exception of the samples modified with SDS and LHA, in which cases they decreased, possibly due to the micellar properties of these compounds. Incubation of EOMs with soil increased their sorption capacity: the Koc values were increased proportionally to the incubation time for both pesticides and for all treatments carried out. Accordingly, the sorption capacity of hydrophobic pesticides increases with the degree of evolution in the soil of EOMs with humic type compounds, possibly due, among other causes, to the increase in the EOMs colloidal properties and the modifications occurring in the hydrophobic- hydrophilic characteristics of the soil surfaces. The main conclusion is that application to the soil of solid carbon rich wastes, especially those with a high degree of maturity, may offer an important strategy for reducing pesticide leaching, and for eliminating pesticide residues from soil with the use of liquid humic acids.
Appears in Collections:(IRNASA) Artículos

Files in This Item:
File Description SizeFormat
AECT-1997.pdf383,85 kBAdobe PDFThumbnail
Show full item record
Review this work

Page view(s)

checked on May 15, 2022


checked on May 15, 2022

Google ScholarTM


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.