Registration Dossier
Registration Dossier
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EC number: 477-690-9 | CAS number: 874819-71-3
Endpoint summary
Administrative data
Description of key information
Adsorption of N-(2-nitrophenyl)phosphoricacid triamide on Soils:
The extent of adsorption of N-(2-nitrophenyl)phosphoricacid triamide was studied on basis of the OECD/OCDE Guideline no.106 for the testing of chemicals, adopted January 21, 2000.
The respective adsorption coefficients on the basis of soil organic carbon content (Koc) were calculated to be
•LUFA 2.1 soil test system38 mL/g (ratio 1:1) and 20 mL/g (ratio 5:1) at 1.21 % org. carbon
•LUFA 2.2 soil test system125 mL/g (ratio 1:1) and 103 mL/g (ratio 5:1) at 2.29 % org. carbon
•LUFA 2.3 soil test system180 mL/g (ratio 1:1) and 132 mL/g (ratio 5:1) at 1.02 % org. carbon
N-(2-nitrophenyl)phosphoricacid triamide showed a significant adsorption onto the experimental soils (reflected by values > 25 %). The clay content of soil is assumed to be a responsible factor for the adsorption of N-(2-nitrophenyl)-phosphoricacid triamide onto soils.
Distribution modelling:
To assess the leaching potential of pesticides PELMO, the Pesticide Leaching MOdel was usecd by German authorities who are involved in the licensing procedure of plant protection products (ÜBA Umweltbundesamt Berlin, and BBA Biologische Bundesanstalt Braunschweig). The versions PELMO 1.0 and 2,01 were developed by the Fraunhofer-Institut für Umweiichemie und Ökotoxikologie and is based on R.F. Carsel's PRZM-Model. The current version PELMO 3.0 is additionally able to simulate the fate of metabolites (development of the institute „SLFA" in Neustadt (Germany). PELMO is a compartmental model for the simulation of chemical movement in the unsaturated soil system within and below the plant root zone. Transport on the passage of time including advection and dispersion are represented in the program. Sorption is estimated based on the Freundlich equation, degradation of pesticides in soil is corrected based on temperature and soil moisture. In this study the fate of N-(2-nitrophenyl)phosphoricacid triamide was simulated using the German standard scenario for applications in winter wheat, winter barley, winter rape, and maize according to the GAP.
Annual percolate concentrations at 110 cm depth were simulated to be 0.000 µg/L independent on the crop simulated. If the input data on degradation and sorption which were used in the computer simulations are valid under agricultural conditions considerable annual concentrations of N-(2-nitrophenyl)phosphoricacid triamide above 0.1 µg/L in the percolate at 1.1 m soil depth are not expected.
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