Registration Dossier
Registration Dossier
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EC number: 221-374-3 | CAS number: 3081-01-4
Endpoint summary
Administrative data
Description of key information
Additional information
7PPD has a relatively high Koc value of 11480 (calculated). As the hydrolyis occurs fast (half-life 5.15h) also the hydrolysis product(s) are taken into account. For 4 -Hydroxydiphenylamine, the Koc was calculated to be 398.
The distribution of the parent compound and the two hydrolysis products 4 -hydroxydiphenylamin and N-Phenyl-p-benzoquinone monoimine was calculated using the Mackay distribution model:
| Compartment | 7PPD | 4-hydroxydiphenylamine |
N-phenyl-p-benzoquinone monoimine |
| Air (%) | 0.17 | 0.16 | 0.09 |
| Water (%) | 4.06 | 95.87 | 99.2 |
| Soil (%) | 47.43 | 2.19 | 0.39 |
| Sediment (%) | 47.95 | 1.77 | 0.32 |
| Suspended sediment (%) | 0.3 | 0.014 | 0.003 |
| Biota (%) | 0.03 | 0.001 | 0.0002 |
| Aerosol (%) | 0.06 | 0.001 | 0.0001 |
The model indicates that the parent compound has a high affinity to soil and sediment whereas the primary hydrolysis products are expected to be distributed mainly in water.
It should be mentioned here that the distribution modelling gives only a rough indication about the distribution of a substance in the environment. Paraphenylenediamins are transported to the environment mainly by tyre abrasion. Tyre road wear particles are distributed differently than estimated by the distribution model: About 78% end up in soil and about 22% in water and sediment (Danish EPA 2015). Thus, soil is the most relevant compartment.
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