Registration Dossier
Registration Dossier
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EC number: 249-854-8 | CAS number: 29797-40-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
A log Koc of 3.36 was determined for DCT mixture according to OECD 121 (Reference: Neuland, 2010), indicating that DCT mixture is slightly mobile in soil. Following this result the substance is not highly adsorptive according to REACH guidance document Table R. 7.11-2 (ECHA 2012).
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 291
Additional information
Key study
The adsorption coefficient was determined for dichloromethylbenzene mixture by the HPLC-method according to the OECD Guideline 121. The test temperature was 40 °C. The elevated temperature had no impact on the result, which can therefore be related to 25°C.
The adsorption coefficient was determined to be log Koc = 3.36.
Reference: Neuland, 2010
Supporting study
The distribution coefficient log Koc of the dichloromethylbenzene mixture was calculated to be 3.65 - 3.73. The programme KOCWIN v.2.00 and the experimental result of log kow = 4.2 - 4.3 obtained with the HPLC method according to OECD Guideline 117 (Neuland, 2010) were used.
Reference: Keller, 2010
Further studies
The log Koc was calculated for 2,4-DCT, 2,5-DCT, 3,4 - and 2,3 -DCT with PCKocWin v.1.66 to be 2.9.
As being a calculation, the reliability is lower or equal to 2, but cannot be assigned definitely, because the information on the used log kow is missing. (Reliability: 4)
Reference: Lanxess, 2009
The Koc value was calculated for 2,4-dichlorotoluene to be 4800 (log koc = 3.68) by using a measured log Kow of 4.24 according to Hansch and Leo, 1985 and a regression-based equation by Lyman, 1990.
As only a short abstract from a peer-reviewed database is available, the reliability cannot be assigned definitely.The result refers only to one of the isomers of the mixture and was obtained by calculation, therefore the reliability is not comparable to the reliability of the key study. (Reliability: 4)Reference: HSDB, 2009
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