Registration Dossier
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EC number: 201-052-9 | CAS number: 77-73-6
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with column 2 of REACH Annex VIII and IX, the adsorption/desorption study does not need to be conducted as based on the physico-chemical properties the substance can be expected to have a low potential for adsorption (the substance has a log octanol water partition coefficient less than 3). The calculated log Koc is 2.35 and the QSAR estimated log Koc is 2.74-3.18.
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 514
Additional information
In accordance with column 2 of REACH Annex VIII and IX, the adsorption/desorption study does not need to be conducted as based on the physico-chemical properties the substance can be expected to have a low potential for adsorption (the substance has a log octanol water partition coefficient less than 3). The EU risk assessment for dicyclopentadiene stated a Log Pow of 2.78, using OECD TG 107, performed by MITI Japan (1977). The data was unavailable for review. The WHO ICSC (2005), which is considered a reliable source adequate for assessment, provides a Log Kow of 2.78.
However, as the value is used in other parts of the risk assessment, data on the log Koc has been included in the dossier. The Koc for DCPD has been calculated based on the log Kow using the Sabljic et al. (1995) method as set out in the Technical Guidance Document (ECB 2003). The calculated log Koc of DCPD is 2.35 based on a measured log Kow of 2.78.
The Koc of DCPD has been estimated using QSAR models (USEPA 2008). KOCWIN Program (v2.00) uses MCI (molecular connectivity index) and a series of group contribution factors to predict Koc. The log Koc of DCPD has been estimated using QSAR models to be 2.74 (kow method) and 3.18 (MCI method).
[LogKoc: 3.18]
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