Registration Dossier
Registration Dossier
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EC number: 292-605-3 | CAS number: 90640-84-9 A complex combination of hydrocarbons produced by the distillation of coal tar and boiling in the range of approximately 240°C to 280°C (464°F to 536°F). Composed primarily of acenaphthene, naphthalene and alkyl naphthalene.
Endpoint summary
Administrative data
Description of key information
Additional information
Creosote oil, acenaphthene fraction (wash oil) is a liquid organic UVCB substance which cannot be tested for ready biodegradability under standard test conditions. The complex mixture consists of 2- and 3-ring aromatic compounds from naphthalene to phenanthrene, naphthalene, methylnaphthalenes, and acenaphthene amounting to about 50 %.
Individual substances are known to be resistant to ready biodegradation to large extent (see above). Some are expected to be inherently biodegradable. Conflicting results are reported for naphthalene: While not biodegradable in a MITI(II) test (= OECD 302C) (NITE 1979), it proved to be readily biodegradable in a different ready test [MITI(I) = OECD 301C] (Yoshida et al. 1983). The same group found easy biodegradation also for 1- and 2-methylnaphthalene in a MITI(II) test (= OECD 302C).
In a biodegradation study in soil, half-lives of several key constituents of wash oil were determined to be in the range between ca. 2 and 50 days. This demonstrates that wash oil even if not being readily biodegradable can be biodegraded in the environment.
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