Registration Dossier
Registration Dossier
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EC number: 246-014-2 | CAS number: 24085-08-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
One key study completed on the substance; klimisch 1, OECD method and per GLP.
Key value for chemical safety assessment
- Koc at 20 °C:
- 355
Additional information
Note: The results quoted above under the heading " Key value for chemical safety assessment" refer to tests performed at 25°C (and not 20°C)
The distribution coefficient (K d) and organic carbon normalized adsorption coefficient(K o c) for five different soil types, determined after 24 hours incubation at 25 ± 2°C, are shown in the following table:
Soil Type* |
Mean Distribution Coefficient for Adsorption (Kd,cm3/g) |
Mean Organic Carbon Normalized Adsorption Coefficient (Koc,cm3/g) |
Log10Koc |
2 |
84.5 |
2.24x103 |
3.35 |
3 |
18.9 |
760 |
2.88 |
4 |
13.6 |
355 |
2.55 |
5 |
8.04 |
884 |
2.95 |
7 |
206 |
806 |
2.91 |
Overall Kdrange: 8.04 to 206 cm3/g
Overall Kocrange: 355 to 2.24 x103cm3/g
log10Kocrange: 2.55 to 3.35
With the exception of soil type 7, no adsorption equilibrium plateaux were obtained on monitoring the relationship of percentage adsorption against time, up to a maximum incubation time of 48 hours. Through repeating the procedure with sterilized soils, it was confirmed that this relationship did not originate from biodegradation, but may be attributable to a slow diffusion interaction with the soils. Therefore the above results have been calculated from the24 hour incubation period samples, in order to provide a “snapshot” of potential partitioning in the environment. The success of soil type 7 in reaching adsorption equilibrium was attributed to a combination of a significantly higher percentage organic carbon content as well as stronger cationic interactions originating from a lower, more acidic pH, both potentially accelerating adsorption.
Other adsorption coefficient indicated as dimensionless:
- other: Log Koc ,3.35 at the temperature 25.0°C
[LogKoc: 2.55]
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