Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The test substance is a volatile liquid at STP. It has a measured water solubility of 763.3 mg/L at 25°C. The measured vapour pressure is 6.04E+04 Pa (453 torr). The Henry's Law constant is 1.29E+04 Pa m3/mol using measured values for water solubility (WS) and vapour pressure (VP) and a molecular weight (MW) of 164.05 g/mol. Henry's Law constant was calculated using equation R.16-10 (Henry = (VP*MW) /WS) in the REACH guidance R.16.4.3.2.A Partition coefficient log Kow <3 indicates that the test substance is expected to have low potential for adsorption to soils and sediments.

The test substance is not ready or inherently biodegradable. No Biochemical Oxygen Demand (BOD) and change in the test substance concentration were observed in a 28-day ready biodegradation test. The BOD of the test substance was 2.18% after 28 days in an inherent biodegradation test (OECD 302C).

The atmospheric fate of the test substance is dominated by reaction with tropospheric OH radicals. The atmospheric lifetime due to loss by reaction with OH is approximately 20 days. The atmospheric degradation pathway is well understood and proceeds via a number of short-lived intermediates. The final atmospheric degradation products are HF and CO2. The test substance has no ozone depletion potential and a 100-year time horizon GWP is 2 after correction for the short atmospheric lifetime. The contribution of the test substance to regional photochemical ozone formation is expected to be small. A full Maximum Incremental Reactivity (MIR) analysis of the test substance has been performed and the reactivity in the MIR scale was found to be 0.04 grams ozone per gram of test substance, which is about 14% of that calculated for ethane.

Based on the properties discussed above, the substance – while not readily or inherently biodegradable – will not persist in water or soil/sediment as it will rapidly volatilize to the atmosphere. In the atmosphere, fate and degradation of the substance is well known with HF and CO2 as the ultimate degradation products.