Registration Dossier
Registration Dossier
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EC number: 201-944-8 | CAS number: 89-83-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 38 µg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 44.6 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 3.8 µg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 4.46 µg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 396 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 5.71 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.571 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:
- 1.12 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Derivation of PNECs
The PNECs for the different compartments are calculated either by application of an assessment factor (PNEC freshwater, PNEC marine water, PNEC intermittent release and PNEC stp) or by using the equilibrium assumption method (PNEC sediment-freshwater, PNEC sediment-marine-water and PNEC soil). The PNEC air is not considered as relevant based on the chemical structure and intrinsic properties of the registered substance. Secondary exposure of mammals and birds is not expected, and since no adequate bird or mammalian data are available, the PNECsecondary poisoning is omitted. The utilized procedures are described in detail in the ECHA REACH Guidance of May 2008, Chapter R.10 ("Characterisation of dose [concentration]-response for environment").
Conclusion on classification
Thymol is listed in Annex VI to Regulation (EC) No 1272/2008 (CLP Regulation) with Index No. 604 -032 -00 -1 with the following harmonised classification regarding the environment: Aquatic Chronic 2, H411
According to the up-to-date information, classification is considered unnecessary:
The most sensitive acute toxicity is to aquatic fish (Oryzias latipes) and invertebrates (Daphnia magna) with an LC50(96h) of 4.67 mg/L (MITI, 2005) and LC50(48h) of 4.46 mg/L (MITI, 2005), respectively. The most sensitive chronic aquatic toxicity is to aquatic algae (Pseudokirchneriella subcapitata) and aquatic daphnia (Daphnia magna) with NOEC(72h) of 1.9 mg/L (MITI, 2005) and NOEC(48h) of 2.0 mg/L (MITI, 2005), respectively. In addition the test material is proven to be readily biodegradable (Currenta, 2010) and it is not considered bioaccumulative due to the measured BCF of 48 (MITI, 1996), that is lower than 500.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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