Registration Dossier
Registration Dossier
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EC number: 248-383-5 | CAS number: 27277-00-5
Endpoint summary
Administrative data
Description of key information
Additional information
Adsorption / desorption
In a GLP-compliant study according to OECD 121, the log Koc of the test item was determined to be <1.25. The sorption potential to sediment/soil is considered negligible.
Leaching in soil
The mobility of 14C-labeled test substance was determined by soil thick-layer chromatography.
In a first experiment 167.6 µg/chromatogram (6.7 kg/ha) of the test substance was applied, and 4 soils were used Gore Hill (a calcareous clay loam), Lily Field (a coarse sand), Pear Tree (a coarse sandy loam), and Blackborough (a peat). Atrazine, a moderately mobile herbicide, was studied under the same conditions as a standard. On applying 32 cm ‘rain’ the distance of leaching of the test substance as measured by peak concentrations were >20 cm, 10 cm, >7 cm and 2 cm in Lily Field, Gore Hill, Pear Tree and Blackborough soils, respectively. Under the same conditions the leaching of atrazine reached peak concentration at a distance of 5 to 10 cm.
In a second experiment using Lily field Soil, 182.2 µg and 11.39 µg were applied to separate chromatograms. After leaching, the distribution of the test substance on chromatograms and in leachates was similar to that of the first study. The 14C in these leachates was shown by TLC to be the test substance.
It is concluded that the test substance has a moderate mobility in clay loam, sandy loam, and peat soils and a high mobility in coarse sandy soils i.e. with less than 1.5% organic matter. From a normal rate application (2.5 g/ha) the concentration of the test substance in soil solution which has percolated through the top soil will be less than 0.0001 µg/mL.
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