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EC number: 284-895-5 | CAS number: 84989-06-0 The fraction of tar acids, rich in 2,4- and 2,5-dimethylphenol, recovered by distillation of low-temperature coal tar crude tar acids.
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 100 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 24 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 10 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 15 µg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 1.14 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 1.84 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.184 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.096 mg/kg soil dw
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
The ecotoxicity assessment based on a weight-of-evidence approach considering studies for the registered UVCB mixture on acute aquatic toxicity to fish, Daphnia and algae as well as numerous ecotoxicity data for constituents of Tar acid, xylenol fraction, (CAS 84989-06-0). The acute aquatic toxicity data for fish, Daphnia and algae indicates that Tar acid, xylenol fraction (CAS 84989-06-0) is slightly less toxic than some of its constituents. In a weight-of-evidence approach all data were considered and the lowest effect value for each endpoint was chosen as key value for the chemical safety assessment. Thus, even in cases where less sensitive values would be available for Tar acids, Xylenol fraction itself, these values were not considered in favour to base the hazard assessment and classification on a worst case (e.g. see PNEC derivation above or conclusion on classification below).
Conclusion on classification
Classification related key information
Biodegradation in water: Not readily biodegradable
Bioaccumulation: low bioaccumulation potential based on log Kow <3
Aquatic acute toxicity
- Fish (freshwater): LC50 (96 h) = 4.4 mg/L (Salmo trutta) (read-across to p-cresol)
- Fish (marine): EC50 (96 h) = 3.7 mg/L (Gadus morrhua, eggs) (read-across to 2,4-xylenol)
- Aquatic invertebrates (freshwater): EC50 (48 h) = 2.37 mg/L (Daphnia magna) (read-across to 2,4-xylenol)
- Aquatic invertebrates (marine): EC50 (96 h) = 1.5 mg/L (Strongylocentrotus droebachiensis, eggs) (read-across to 2,6 -xylenol)
- Algae (freshwater): ErC50 (48 h) = 7.8 mg/L (Desmodesmus subspicatus) (read-across to p-cresol)
Aquatic chronic toxicity
- Fish (freshwater): NOEC (32 d) = 1.35 mg/L (Pimephales promelas) (read-across to p-cresol)
- Aquatic invertebrates (freshwater): NOEC (21 d) = 1.0 mg/L (Daphnia magna) (read-across to p-cresol)
- Algae (freshwater): NOEC (72 h) = 1.7 mg/L (Pseudokirchneriella subcapitata) (read-across to mixed xylenols)
Classification justification according to CLP
As a worst case assumption an analogue read-across approach considering the most toxic cosntituents was followed. Acute and chronic data on the toxicity of constituents of Tar acids, Xylenol fraction (CAS 84989-06-0) to aquatic organisms are available for all trophic levels. Tar acids, Xylenol fraction (CAS 84989-06-0) is considered to be not rapidly biodegradable and to have a low bioaccumulation potential (log Kow <3). The lowest acute aquatic toxicity value is 1.5 mg/L (EC50-96h, marin fish) and the lowest chronic toxicity value is 1 mg/L (NOEC-21d, water flea). Therefore, Tar acids, Xylenol fraction (CAS 84989-06-0) is classified and labelled as Category Chronic 2 for environmental hazards according to the consolidated version of Regulation (EC) No 1272/2008 (dated: 01.01.2017) and further amendments (ATPs).
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