Effect of Undesalted Dissolved Organic Matter from Composts on Persistence, Adsorption, and Mobility of Cyhalofop Herbicide in Soils

The effect of undesalted dissolved organic matter (DOM) extracted from composts on the degradation, adsorption, and mobility of cyhalofop herbicide in soils was studied. A paddy-field sediment poor in organic matter (OM), an OM-rich forest soil, and DOM from agroindustrial or municipal waste compost...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2008-06, Vol.56 (11), p.4102-4111
Main Authors: Blasioli, Sonia, Braschi, Ilaria, Pinna, Maria V, Pusino, Alba, Gessa, Carlo E
Format: Article
Language:English
Subjects:
Adsorption
Biological and medical sciences
Butanes - analysis
Butanes - chemistry
Cations
chemical degradation
composts
cyhalofop
dissolved organic matter
Environmental Chemistry
Food industries
forest soils
Fundamental and applied biological sciences. Psychology
half life
herbicide residues
Herbicides - analysis
Herbicides - chemistry
hydrolysis
hydrophobicity
Kinetics
leaching
metabolites
metals
MSW composts
Nitriles - analysis
Nitriles - chemistry
paddy soils
Pesticide
potassium
Potassium - pharmacology
Soil - analysis
soil columns
soil organic matter
soil transport processes
Solubility
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Summary:The effect of undesalted dissolved organic matter (DOM) extracted from composts on the degradation, adsorption, and mobility of cyhalofop herbicide in soils was studied. A paddy-field sediment poor in organic matter (OM), an OM-rich forest soil, and DOM from agroindustrial or municipal waste compost were used. DOM increased the cyhalofop-acid but not the cyhalofop-butyl solubility in water. The degradation of cyhalofop-butyl in the sediment was slow, giving cyhalofop-acid as the only metabolite, whereas in forest soil, the process was faster, and three byproducts were detected. Soil pretreatment with DOM did not modify the degradation pattern but only reduced the adsorption of cyhalofop-butyl by soil, whereas it increased the adsorption of cyhalofop-acid. Among the cationic components of DOM solutions, the potassium ion seems to be related to the increased adsorption of the cyhalofop-acid in both OM-poor and OM-rich soils, yielding reversible complexes with the former and favoring hydrophobic interactions with the latter.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf7036906