Registration Dossier
Registration Dossier
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EC number: 203-250-0 | CAS number: 104-90-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
According to column 2 of REACH Annex VIII section 9.3.3 testing for adsorption/desorption was waived, as the substance is expected to have a low potential for adsorption based on the low octanol water partition coefficient (logPow = 2.1 at 22 °C). Further, the substance and its relevant degradation products decompose rapidly (ready biodegradable, but failing the 10-day window).
The test method for determination of the adsorption coefficient (Koc) according to EU Method C.19 was replaced by a theory based evaluation. The log Koc was calculated using the US EPA EPIWIN (v4.0) software. The resulting Koc was 352.2 and 265.1 and log Koc was 2.55 and 2.42 for MCI method and log Kow, respectively.
The Koc value suggests that the chemical is expected to have moderate mobility in soil. The pKa of 6.6 indicates that the chemical exist in the protonated form under acidic conditions. Cations adsorb more strongly to soil surfaces than neutral molecules. If released to water, the substance is not expected to adsorb to suspended matter and sediment.
Key value for chemical safety assessment
- Koc at 20 °C:
- 352.2
Additional information
[LogKoc: 2.55]
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