Registration Dossier
Registration Dossier
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EC number: 801-093-8 | CAS number: 1315251-11-6
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption/desorption characteristics of the substance were studied in 5 different soils: Soil type 2 (loam), Soil type 3 (Silt loam), Soil type 4 (Silt loam), Soil type 5 (Loamy sand) and Soil type 7 (loamy sand) using a standard batch equilibrium method at 25 ± 2°C. The study was conducted in according to OECD TG 106 and was in compliance with GLP criteria. The soils used had a pH in the range 3.1 to 7.3 and an organic carbon contents in the range 1.01 to 22.7%. Preliminary experiments were conducted to ascertain the time required to achieve an equilibrium between the test substance in solution and adsorbed to soil and to confirm that an appropriate soil : solution ratio was used for the definitive experiments. These experiments indicated a soil: soil to solution ratios of 1:100, 1:25 and 1:100 would optimise the analytical results for soil type 2, soil type 5 and soil type 7 respectively. Soil to solution ratios of 1:50 and 1:100 were selected for soil type 3 and soil type 4 respectively. For the definitive experiment, the selected soil to solution rations were followed by mixing appropriated amount of soil to 25 mL of 0.01M calcium chloride solution. The 24-h adsorption step was followed by 24-h desorption step. Results: The results showed that the mean values for adsorption distribution coefficients (Kd) per soil were in the range of 40.2 to 1500 L/kg and the organic carbon normalised adsorption coefficient (Koc) values were in the range of 3580 to 6860 L/kg. Log Koc per soil were in the range of 3.55 to 3.84. The mean values for desorption coefficients (Kdes) per soil were in the range 68 to 3530 L/kg and the organic carbon normalised Kdes values were in the range 5680 to 15600 L/kg. Log Kdes per soil were in the range of 3.75 to 4.19. Based on the findings, it was concluded that the substance has a geometric mean Koc of 4923 L/kg and a mean log Koc of 3.70.
Key value for chemical safety assessment
- Koc at 20 °C:
- 4 923
Additional information
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