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Environmental fate & pathways

Adsorption / desorption

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Description of key information

In accordance with column 2 of REACH Annex IX, the study does not need to be conducted as the substance is hydrolytically unstable, the half-life of 7PPD is 5.15 h. 
However, the calculated low Koc values from 7PPD were used for the calculations of the PNECs for sediment and soil.

Key value for chemical safety assessment

Koc at 20 °C:
11 480

Additional information

N-(1,4-dimethylpentyl)-N'-phenylbenzene-1,4-diamine. For assessment, the value LogKoc = 4.06 was taken. It has to be taken into account, that the substance is hydrolytically unstable (half-life 5.15 h).

4-Hydroxydiphenylamine (CAS 122-37-2) was identified as the primary hydrolysis product. The Benzoquinoneimine-n-phenyl is the oxidized form of 4-hydroxydiphenylamine (Monsanto, 1986). The estimated LogKoc values for 4-hydroxydiphenylamine was 406 L/kg (logKow method), and 1061 L/kg(MCI method. (Currenta, 2016)

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.