Registration Dossier
Registration Dossier
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EC number: 212-634-7 | CAS number: 834-12-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption Koc values for the substance ranging from 96 to 927, and desorption Koc values ranging from 307 to 990 have been measured using the batch equilibrium method. According to the classification of chemical mobility in soil described by Swann et al. (1993), Koc values in the range 150-500 constitute the Medium mobility class, and those in the range 500-2000 the Low mobility class. On this basis, the substance is expected to demonstrate low to medium mobility in soil.
Key value for chemical safety assessment
- Koc at 20 °C:
- 511
Additional information
Two studies are available that describe the adsorption/desorption of the substance.
The key study is a Klimisch-1, GLP-compliant study, sponsored by Ciba-Geigy and carried out in 1998 by Agrisearch Incorporated (Spare WC) using the batch equilibrium method (equivalent or similar to OECD 106, EC C.18), but using only 4 soil types instead of 5. The adsorption of 14C-labelled ametryn onto soil from solution was quantified by liquid scintillation counting (LSC) and found to reach equilibrium rapidly (2-4 hours) in all 4 soil types. Adsorption Koc values ranged from 96 to 927, and desorption Koc values ranged from 307 to 990. Radiocarbon balance was 99.5% in the range finding study, and validity criteria were fulfilled.
A supporting study, also sponsored by Ciba-Geigy, was carried out in 1985 by Hazleton Laboratories America Inc. (Blair, Puhl & Daun), again using the batch equilibrium method (equivalent or similar to OECD 106, EC C.18), but without a mass balance determination. The adsorption of 14C-labelled ametryn onto soil from solution was quantified by liquid scintillation counting (LSC) and found to reach equilibrium rapidly (2 hours) in all soil types. Adsorption Koc values ranged from 99 to 161, and a desorption step showed that approximately one-fifth to one-third of the ametryn desorbed from the soil in 2 hours.
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