Document Detail

Ability of the MACRO model to predict long-term leaching of metribuzin and diketometribuzin.
MedLine Citation:
PMID:  19534138     Owner:  NLM     Status:  MEDLINE    
In a regulatory context, numerical models are increasingly employed to quantify leaching of pesticides and their metabolites. Although the ability of these models to accurately simulate leaching of pesticides has been evaluated, little is known about their ability to accurately simulate long-term leaching of metabolites. A Danish study on the dissipation and sorption of metribuzin, involving both monitoring and batch experiments, concluded that desorption and degradation of metribuzin and leaching of its primary metabolite diketometribuzin continued for 5-6 years after application, posing a risk of groundwater contamination. That study provided a unique opportunity for evaluating the ability of the numerical model MACRO to accurately simulate long-term leaching of metribuzin and diketometribuzin. When calibrated and validated with respect to water and bromide balances and applied assuming equilibrium sorption and first-order degradation kinetics as recommended in the European Union pesticide authorization procedure, MACRO was unable to accurately simulate the long-term fate of metribuzin and diketometribuzin; the concentrations in the soil were underestimated by many orders of magnitude. By introducing alternative kinetics (a two-site approach), we captured the observed leaching scenario, thus underlining the necessity of accounting for the long-term sorption and dissipation characteristics when using models to predict the risk of groundwater contamination.
Annette E Rosenbom; Jeanne Kjaer; Trine Henriksen; Marlene Ullum; Preben Olsen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  43     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-06-18     Completed Date:  2009-07-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3221-6     Citation Subset:  IM    
Geological Survey of Denmark and Greenland, Oster Voldgade 10, DK-1350 Copenhagen, Denmark.
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MeSH Terms
Models, Chemical*
Reference Standards
Soil / analysis
Time Factors
Triazines / analysis*
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Soil; 0/Triazines; 0/Water Pollutants, Chemical; 0/diketometribuzin; 21087-64-9/metribuzin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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