Registration Dossier
Registration Dossier
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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.
Endpoint summary
Administrative data
Description of key information
Additional information
Water solubility
After a 39fold weekly elution of pitch, coal tar, high-temp. (coal-tar pitch) powder from a percolation column, the total cumulative amount of water-extractable EPA PAHs amounted to approx. 370 µg/10g (= ~0.004 %). The water-soluble fraction of single PAHs remained far below their theoretical water solubilities, which confirms that freely available PAHs got gradually depleted.
After eluting 100 mg/L of coal-tar pitch in a cycling system, less than 2 µg/L of 16 EPA-PAH were measured in the eluate.
Stability / Degradation
Coal-tar pitch is highly stable under environmental conditions: It is not volatile, not hydrolysable, and not biodegradable.
Bioaccumulation
As coal-tar pitch consists of a high-molecular chemical matrix structure that is highly water insoluble (< 2 µg Sum PAH/L, << 1mg C/L loading 100 mg/L), the material cannot pass biological membranes due to its complex matrix structure, and hence is not bioaccumulating.
Distribution
Pitch particles are expected to interfere and mix with sediment and soil matter with no or little tendency of mobility.
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