Registration Dossier
Registration Dossier
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EC number: 258-649-2 | CAS number: 53585-53-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.14 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.014 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 1 g/L
- Assessment factor:
- 1
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.05 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.005 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:
- 2 mg/kg soil dw
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 11.1 mg/kg food
- Assessment factor:
- 90
Additional information
Dibenzyltoluene shows a very low solubility in water (ca. 20 µg/L). No acute toxicity is observed up to the solubility limit (slightly different from a test to another depending on experimental conditions and medium composition). A long term toxicity to fish was performed given a NOEC = 5.5 µg/L. Moreover, a long term toxicity study on invertebrates was performed given an EC10 = 1.4 µg/L. This value is used to derive a PNECaqua value of 0.14 µg/L using an assessment factor of 10 (considering chronic data available for three trophic level : algae, invertebrates and fish).
A PNECsediment is calculated using the results of the acute toxicity on a marine reworker on the one hand and on the other hand, the equilibrium partitioning method. The worst PNECsediment value is retained. Nevertheless, from information available on production dry process and uses that are in closed systems, recovery of the used product for incineration, no exposure of sediment is expected.
A PNECsoil is derived from studies on terrestrial organisms, even if from information available on uses no exposure of soil compartment is expected.
Conclusion on classification
No toxicity related to acute classification is proposed due to lack of observed effects in acute tests.
A long term toxicity study on invertebrates was performed given an EC10 = 1.4 µg/L which is the most toxic effect observed in the chronic toxicity studies for aquatic organisms.
Based on this result and given the logKow > 6 and a lack of ready biodegradability, according to CLP criteria, the substance is classified as "Chronic category 1" : H410 with a chronic M-factor of 10.
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