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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Substance is a gas of low solubility and is expected to quickly disappear from the aquatic phase. Therefore, 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.

Key value for chemical safety assessment

EC50 for freshwater algae:
64 mg/L

Additional information

Substance is a gas of low solubility and is expected to quickly disappear from the aquatic phase. Therefore, 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.

The growth inhibition concentration (EC50) of TFE to Algae was estimated by ECOSAR v1.00 as 64 mg/l. This predicted value is below the solubility limit of 110 mg/L which, however was only obtained in equilibrium with 1 atmosphere TFE. Moreover, experience with other fluorocarbons shows that for this endpoint ECOSAR v1.00 predictions tend to be signifcantly lower than experimental values, and so the predicted algae EC50 of 64 mg/l for TFE may well be conservative. Given that there is no direct or indirect exposure of the aquatic environment to TFE, and that it will disappear rapidly from water, likely concentrations would be many orders of magnitude below the solubility limit. Therefore, it is concluded that TFE will not be toxic to algae.