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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Abiotic degradation:

Air: Based on estimation with the QSAR model Aopwin the substance undergoes in air rapid degradation after reaction with hydroxyl radicals. The DT50 value after reaction with hydroxyl radicals is 6.7 hours. 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, 6th Edition, CLP, 2008).

Water: The substance is hydrolytically stable based on its structural properties.

Biotic degradation:

In a biodegradation screening study (OECD TG 301C), after 28 days exposure of secondary activated sludge to 100 mg/L substance, 92% biodegradation was observed. Based on these findings the substance is considered to be readily biodegradable.

Bioaccumulation:

Based on the log Kow of 3.8 it can be concluded that the substance has low bioaccumulation potential with calculated BCF values for aquatic and terrestrial organisms of 339 and 77 L/kg ww, respectively.

Transport and distribution:

The adsorption potential of the substance was determined in a study according to OECD TG 121 (HPLC method). Under the conditions of the test, the log Koc of the substance was determined at 3.76 (equivalent Koc = 5780 L/kg). Based on this value it may be concluded that the substance has some potential for adsorption to solid surfaces.

A Henry's law constant of 7.14 Pa·m³/mol (at 12 °C) was calculated in EUSES (Vap pressure 2.4 Pa at 24°C, 182.31 molecular weight and 31 mg/l at 24°C water solubility). Based on this value the substance will partition from water to air.

Based on Level III environmental distribution modelling using EPISUITE (assuming equal and continuous releases to air, water and soil) using the CAS number 137-03-1, it is estimated that the majority of the substance released to the environment will partition mainly into soil (77.2%) and water (20.7%) with small amounts to air (1.66%) and sediment (0.473%).

The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant (STP). Model calculations show that 58.7% of the substance will be degraded and that 1.5%, 8.8% and 30.9% will partition to air, water and sewage sludge, respectively.

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