Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Abiotic degradation:

Air: Based on estimation with the QSAR model Aopwin the substance undergoes in air rapid degradation after reaction with hydroxyl radicals or ozone. The DT50 values after reaction with hydroxyl radicals and ozone are 1.25 hours and 0.64 hours respectively. The substance will not reach the stratosphere and is therefore not considered to be a long-range transported chemical in air. The substance does not have an ozone depletion potential because it does not contain halogens and does not have the potential to reach the stratosphere (GHS, 3rd Edition, CLP, 2008).

Water: In accordance with column 2 of REACH Annex VIII the hydrolysis test does not need to be conducted as the substance is readily biodegradable. The substance does not contain any hydrolysable groups and therefore the estimated half-life for hydrolysis is estimated to be > 1 year at 25oC.

Biotic degradation:

In a ready biodegradation study (OECD Guideline 310), after 28 days exposure of activated sludge to 25.7 mg/L of Terpineol multi (mainly consisting of alpha-Terpineol), >10% biodegradation of the test substance was reached on Day 5 and >60% biodegradation was reached on Day 12. Hence, the test material met the 10 day window requirement for ready biodegradability. On Day 28, the biodegradation was 80%. The substance and it main constituent alpha-Terpineol is therefore characterised as being readily biodegradable. At the concentration tested, the substance is not inhibitory to micro-organisms.

Bioaccumulation:

Overall it can be concluded that alpha-Terpineol has low bioaccumulation potential with calculated BCF values (based on a log Kow of 2.6 of Terpineol multi, which is can be used for alpha-Terpineol too, as explained at the log Kow) for aquatic and terrestrial organisms of 32.4 and 5.6 L/kg, respectively.

Transport and distribution:

To assess the adsorption potential of the substance, an organic carbon-water partition coefficient (Koc) of 235 L/kg was calculated based on the log Kow value of alpha-Terpineol (being derived from Terpineol multi) in EUSES. Based on this value it may be concluded that alpha-Terpineol has low potential for adsorption to solid surfaces.

A Henry's law constant of 0.186 Pa·m³/mol (at 12 °C) was calculated in EUSES. Based on this value partitioning from water to air is not to be expected.

Based on Level III environmental distribution modelling using EPISUITE (assuming equal and continuous releases to air, water and soil) using the CAS number 98 -55 -5 and the measured physico-chemical parameters as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (73.9%) and water (25.9%) with small amounts to sediment (0.15%) and air (0.03%).

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant. Model calculations show that 85.4% of the substance will be degraded and that 12.4%, 2.16% and 0.073% will partition to water, sewage sludge and air, respectively.