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EC number: 292-607-4
CAS number: 90640-86-1
Distillate from the fractional distillation of coal tar of bituminous coal, with boiling range of 240°C to 400°C (464°F to 752°F). Composed primarily of tri- and polynuclear hydrocarbons and heterocyclic compounds.
No specific Koc value can be determined for AOH due to the complexity of its composition. The mean of the Koc values estimated for the key constituents phenanthrene, anthracene, fluoranthene and pyrene is considered to represent best the overall distribution properties of AOH.
Due to the complex
composition of the substance distillates (coal tar), heavy
oils (anthracene oil >50 ppm BaP, AOH),
a specific Koc value cannot be determined for the substance following
standard procedures. Main components (all PAH) will have their
individual Koc values. An extract on Koc values for individual PAH and
an estimated Koc value for AOH is presented in the following paragraphs.
Koc values of PAH have been
estimated by calculations based on Pow/log Pow values using different
relations between Pow/log Pow and Koc/log Koc. Well established is the
equation by Karickhoff et al. (1979) derived from experimental data: log
Koc = log Pow - 0.21 (or Koc = 0.63 Kow). Koc data quoted will originate
from this equation. Koc data derived using this equation have also been
used in the EU Risk Assessment Report for Coal-tar pitch, high
temperature (European Union 2008).
Overall properties of AOH
will best be represented by the range of Koc values corresponding to the
main PAH present in the substance (phenanthrene to pyrene, see Chapter
1.). The estimated adsorption coefficients (Koc) extend from approx.
23,000 to 100,000 (range of log Koc = 4.36 - 4.99) for the key
constituents in AOH. It is considered that an average Koc will best
represent the distribution properties of the substance AOH. Therefore,
the arithmetic mean of the Koc values of the four main constituents in
AOH (phenanthrene, anthracene, fluoranthene, pyrene) is calculated. This
way, a Koc of 52,250 for AOH is estimated. Log Koc is 4.718.
(For Log Pow values of AOH
and of relevant PAH see CSR Chapter 1.3 and IUCLID Sect. 4.7).
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