Registration Dossier
Registration Dossier
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EC number: 810-533-8 | CAS number: 330459-31-9
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The adsorption and desorption of the test substance are concentration dependent, with the highest adsorption and the lowest desorption occurring at the lowest test substance concentration. The Koc values place the test substance in the slightly mobile to hardly mobile category according to FAO classification.
Key value for chemical safety assessment
- Koc at 20 °C:
- 2 973
Additional information
A study was conducted to assess the adsorption / desorption characteristics of the test substance using the batch equilibrium method given in OECD Guideline 106 and US EPA OCSPP Guideline 835.1230, in compliance with GLP. Six soils typical of growing regions in North America were used. The study included preliminary tests, tier 2 adsorption kinetics, tier 3 desorption kinetics and tier 3 adsorption / desorption isotherm tests. All tests were conducted in the dark in a temperature-controlled chamber maintained at 20 ± 2°C. HPLC/UV technique was used to detect the concentrations of the test substance. The sorption Kd values ranged from 20.41 in the Grangeville sandy loam (Madera) soil to 247.60 in the Webster sandy clay loam (Dana) soil. The Kom values ranged from 1,729 in the Hoyleton silt loam (Carlyle) soil to 5,895 in the Webster sandy clay loam (Dana) soil, while the Koc values ranged from 2,973 in the Hoyleton silt loam (Carlyle) soil to 10,140 in the Webster sandy clay loam (Dana) soil. The desorption Kd des values ranged from 36.14 mL/g in the Grangeville sandy loam (Madera) soil to 369.74 mL/g in the Webster sandy clay loam (Dana) soil. The desorption Kom des values ranged from 2,563 mL/g in the Hoyleton silt loam (Carlyle) soil to 8,803 mL/g in the Webster sandy clay loam (Dana) soil. The desorption Koc des values ranged from 4,409 mL/g in the Hoyleton silt loam (Carlyle) soil to 15,142 mL/g in the Webster sandy clay loam (Dana) soil. Based on the results of the study, it was concluded that the adsorption and desorption of the test substance are concentration dependent with the highest adsorption and the lowest desorption occurring at the lowest test substance concentration. The Koc values place the test substance in the slightly mobile to hardly mobile category according to the FAO classification based on Koc (Clark B, 2013).
[LogKoc: 3.47]
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