Registration Dossier
Registration Dossier
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EC number: 200-839-4 | CAS number: 75-10-5
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Based on its physico-chemical properties and according to the distribution modeling, when released to the environment the majority of difluoromethane will partition into the air compartment (99.99%). Moreover difluoromethane is neither expected to sorb significantly to soil and sediment. nor to bioaccumulate in aquatic species due to its low potential for adsorption and bioaccumulation based on a measured log Kow of 0.21. So, Difluoromethane, when released to the environment, will enter almost exclusively into the ambient air; it has little tendency to partition to water, biota or soil. Because of its moderate sorption affinity, difluoromethane is expected to be mobile in soil. The most important degradation process occurs in the atmospheric compartment. Las but not least, a calculation with EpiWin software (US-EPA, 2009) suggests volatilisation half-lives of about 45 minutes for rivers and 69 hours for lakes.
The concerned substance is a gas of low toxicity and any impact on the aquatic environment is expected to be low. According to 9.1.2 Column 2 of REACH Annex VII the study need not be conducted if there are mitigating factors indicating that aquatic toxicity it unlikely to occur.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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