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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Ecotoxicological Summary

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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.