Registration Dossier
Registration Dossier
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EC number: 267-500-0 | CAS number: 67874-72-0
Endpoint summary
Administrative data
Description of key information
Abiotic degradation:
Air: Based on estimation with the QSAR model Aopwin, the substance undergoes rapid degradation in air after reaction with hydroxyl radicals. The DT50 values after reaction with hydroxyl radicals is 24.6 hours(in accordance with EU TGD, 2003, 2.3.6.3).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: Based on read-across from the close structural analogues Verdox and Cyclabute, the hydrolytical half-life is determined at <28 days.
Biotic degradation:
Coniferan biodegraded up to 12% in an OECD TG 310 study, based on this result the substance is not readily biodegradable.
Bioaccumulation:
Assessment of bioaccumulation in aquatic species is based on the available information (BCF from read-across) and is deemed sufficient for the PBT assessment, classification and labelling and the chemical safety assessment. The BCF for aquatic organisms is derived from read-across to the close structural analogue Verdox (CAS# 20298-69-5) and determined at 156 L/kg w.w. In addition, the BCF in earthworms was estimated with the equation from Jager (1998) which is incorporated in the EUSES model and calculated to be to be 3020 L/kg w.w.
Transport and distribution:
A Koc value of 3236 L/kg w.w. (log Koc = 3.51), as derived from read across to the close structural analogue Verdox, indicates that the substance has high potential to adsorb to sediment/soil.
To assess the volatilisation potential of the substance a Henry's law constant was calculated which showed a value of 59.9 Pa·m3/mol (at 12 °C). Based on this value partitioning from water to air may 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 67874 -72 -0 and the measured physico-chemical parameters (water solubility and log Kow) as input, it is estimated that the substance released to the environment will partition into air (0.98%), water (13.6%), soil 84.8% and sediment (0.65%).
The SimpleTreat model, which is incorporated in EUSES, simulates the distribution of the substance in a Sewage Treatment Plant. Model calculations show that 0% of the substance will be degraded and that 32.1%, 39.3% and 28.6% will partition to water, sewage sludge and air, respectively.
Additional information
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