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:
- 0.038 mg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.032 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.004 mg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 0.396 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 3.16 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.316 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.606 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
According to Directive 67/548/EEC, thymol is legally classified as "Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" with the phrase of R 51-53 and is assigned the symbol "N" in Annex I.
According to the up-to-date information, classification is considered unnecessary:
- The most sensitive acute toxicity is to aquatic fish (Pimephales promelas) and invertebrate (Daphnia magna): 96h- LC50 of 3.2 mg/L and 48h-LC50 of 3.2 mg/l (Ewell et al., 1986).
- The acute toxicity observed is much lower than the water solubility of thymol (ca. 980 mg/l).
- Thymol is readily biodegradable (Currenta, 2010).
- Measured BCF of ca. 48 is lower than 100 (MITI, 1996)
Based on the data listed above, thymol is considered not necessarily to be classified according to GHS (Regulation EC 1272/2008).
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