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Content archived on 2024-06-16

Sorption of urea herbicides to black carbon

Objective

Pyrogenic carbon particles (collectively termed black carbon; BC) are ubiquitously present in sediments and soils and appear to explain fractions of strongly sorbed hydrophobic organic contaminants, thus having implications for the fate, availability and toxicity of these compounds.

In common for compound groups exhibiting strong sorption to BC is their (capability of attaining a) planar conformation (e.g. polycyclic aromatic hydrocarbons; PAHs).

Strong adsorption to combustion residues is not yet included in the current scientific picture of how pesticides distribute in the environment, although the molecular structure of many pesticides indicates the potential for a high affinity to BC.

The overarching objective of the proposed study (SUREAL) is to better understand pesticide sequestration and availability in soils and sediments.

The scientific objectives are
- to study the mechanism behind BC sorption for phenyl ureas,
- to investigate competition between PAHs and phenyl ureas, and
- to study the in -field relevance of BC sorption for phenyl ureas.

Phenyl ureas were selected as model pesticides, because
- strong sorption to burned crop residues was reported,
- of their largely planar conformation,
- they are commonly used in Europe, and
- they were frequently detected in the aqueous environment.

Laboratory sorption experiments will be conducted with BC and carefully selected soils and sediments representing different organic matter characteristics, BC and PAH content. SUREAL, contributing to a refined and improved risk assessment of pesticides in the environment, refers in several ways to the European research areas as specified for the sixth framework programme.

More specifically, it relates to the European water framework directive, of which one of the main goals is to achieve a good chemical status, partly by applying a list of priority pollutants to be phased out or undergo review, including two of the proposed phenyl ureas.

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Keywords

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Topic(s)

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Call for proposal

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FP6-2004-MOBILITY-5
See other projects for this call

Funding Scheme

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EIF - Marie Curie actions-Intra-European Fellowships

Coordinator

AGROSCOPE FAL RECKENHOLZ; SWISS FEDERAL RESEARCH STATION FOR AGROECOLOGY AND AGRICULTURE (FAL)
EU contribution
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Total cost

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