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EC number: 266-028-2
CAS number: 65996-93-2
The residue from the distillation of high temperature coal tar. A black solid with an approximate softening point from 30°C to 180°C (86°F to 356°F). Composed primarily of a complex mixture of three or more membered condensed ring aromatic hydrocarbons.
In general, the volatility of dissolved constituents of pitch, coal tar,
high-temp. (CTPht) from the water phase is very low. Benzo[a]pyrene
(BaP) has been selected as marker substance in order to characterise the
environmental fate of CTPht. Hence, an experimental value of Henry's Law
Constant for BaP is used for the chemical safety assessment.
The experimental HLC value for BaP is taken from the publication of de
Maagd et al. (1998, see Reference). Reported value is 0.034 Pa*m³/mol.
In addition, a HLC value for CTPht is calculated for comparison using
the water solubility (0.242 mg/L) and the vapour pressure (5.8*10-06
Pa) of CTPht at 20 °C. As there is no definite molecular weight for
CTPht (UVCB), the molar mass of BaP (252.3) is used in the calculation.
H = VP / WS x MW = 5.8*10-6 Pa / 0.242
mg/L x 252.3 g/mol = 0.006 Pa*m³/mol
de Maagd P. G.-J., ten Hulscher D. Th.E.M., van den Heuvel H.,
Opperhuizen A., and Sijm D. T.H.M. (1998) Physicochemical Properties of
Polycyclic Aromatic Hydrocarbons: Aqueous Solubilities, n-Octanol/Water
Partition Coefficients, and Henry's Law Constants. Environmental
Toxicology and Chemistry 17, 251-257
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