Registration Dossier
Registration Dossier
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EC number: 701-305-8 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Data for Pitch, coal tar, high-temp., < 1% 4- to 5-membered condensed ring aromatic hydrocarbons [EC no. 701-305-8] (CTPhtht) is not available. Results from a cell multiplication inhibition test with the supporting substance Pitch, coal tar, high temp. [CAS no. 65996-93-2] is used instead to characterise the toxicity of CTPhtht to microorganisms. No inhibitory effect was observed up to a nominal concentration of 10000 mg/L (loading).
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 10 000 mg/L
Additional information
No experimental data is available for the substance Pitch, coal tar, high-temp., < 1% 4- to 5-membered condensed ring aromatic hydrocarbons [EC no. 701-305-8] (CTPhtht) itself, but data have been identified for Pitch, coal tar, high temp. [CAS no. 65996-93-2], the precursor material. This is used as supporting substance. Coal tar pitch, high termp. is closely structure-related to CTPhtht, and comprises also an inert matrix of highly ring-condensed polycyclic aromatic hydrocarbons. Due to the production process, the target substance CTPhtht will be depleted of available single PAH constituents compared to Pitch, coal tar, high temp. [CAS no. 65996-93-2]. Therefore, results originating from coal tar pitch, high temp., can be considered as worst-case situation.
Toxicity to microorganism was tested with coal tar pitch in a Pseudomonas putida cell multiplication inhibition test (Hillmann E. 1991). No inhibition was detected at a loading of 10,000 mg/L (EL0 = 10,000 mg/L).
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