Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

HFC 134a, when released to the environment, will enter almost exclusively into the ambient air; it has little tendency to partition to biota or soil. Because of its moderate sorption affinity, HFC 134a is expected to be mobile in soil. Atmospheric degradation of HFC 134a occurs mainly in the troposphere by reaction with hydroxyl radicals leading to trifluoroacetic acid, formic acid, hydrofluoric acid and carbon dioxide as ultimate degradation products. Trifluoroacetic acid appears to be rather stable in environmental conditions and is known to be naturally occurring. The overall atmospheric lifetime of HFC 134a is estimated to range from 13.6 to 14.0 years. HFC 134a has a global warming potential of 1300 relative to carbon dioxide (=1) using an integration time horizon of 100 years. The actual contribution of HFC 134a to the greenhouse effect is, currently, insignificant (0.14% of that of carbon dioxide) due to its low atmospheric concentration (13.6 ppt).