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Research Articles
Evaluation of Fate and Exposure Models. Uptake of Terbuthylazine and its Medium Polar Metabolites into Maize Plants
Sebastian Gayler; Stefan Trapp; Michael Matthies; Reiner Schroll; Herwart Behrendt
Corresponding author:: Prof. Dr. Michael Matthies, University of Osnabrück, Institute of Environmental Systems Research, D-49069 Osnabrück, Germany
The uptake of terbuthylazine and its medium polar metabolism into maize plants under outdoor conditions is investigated. For this purpose, a dynamical fate model consisting of soil, plant and air is developed.
The model calculations are compared with experimental results of outdoor lysimeter tests, carried out with 14C-labelleda herbicide applied to sandy agricultural soil at a single application rate of 890 g/ha. Approximately 0.3% of the applied activity remains in all the plants after the vegetation period.
The model predicts that about three times that amount is volatilized from the plants into the air. Activity uptaken from soil and volatized from plant surface into air is predominately associated with metabolites. During the whole vegetation period the fraction of unchanged terbuthylazine in the plants is very small (less than 1% of the extractable activity). |
2 ESPR (2) 98-103 (1995)
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