Registration Dossier
Registration Dossier
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EC number: 212-344-0 | CAS number: 793-24-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Experimental testing is not applicable as the substance is hydrolytically unstable (half-life is 8 h at 26°C).
However, the calculated low Koc values from 6PPD are useful for the calculation of PNECs using the equilibrium partition method.
Key value for chemical safety assessment
- Koc at 20 °C:
- 2 818
Other adsorption coefficients
- Type:
- other: logKow using MCI method
- Value in L/kg:
- 4.36
Additional information
N-(1,3-dimethylbutyl) -N'-phenylbenzene-1,4-diamine.For assessment, the values LogKoc 3.45 (logKow method) and 4.36 (MCI metode)were taken (Currenta, 2014a). It has to be taken into account, that the substance is hydrolytically unstable (half-life 8 h). The lower of the two values was taken for assessment as it yields the higher PNEC sediment when using the equilibrium partition method (worst case).
4-Hydroxydiphenylamine (CAS 122-37-2)and 1,3-dimethylbutylamine (CAS 108-09-8) were identified as the primary hydrolysis product.
The estimated Log Koc values for 4-hydroxydiphenylamine, using different accepted calculation methods are 3.03 (MCI method), and 2.41 (logKow method) (Currenta, 2014b)
The physico-chemical properties of 4-hydroxydiphenylamine are different especially concerning the Koc value, it should be taken into account that this metabolite has a different behaviour in the environment.
Amine data: The estimated Log Koc values for 1,3-Dimethylbutylamine (CAS 108-09-8), using different accepted calculation methods are 1.83 (logKow method) and 2.02 (MCI method (Currenta, 2014c)
[LogKoc: 3.45]
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