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Ecotoxicological information

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Acute data of various reliability, some based on international guidelines, are available for three trophic levels: Algae, Invertebrates and Fish and are summarised in the table below. In aqueous solution, the pH of the substance is naturally low and for testing on organisms either the sodium salt (NaTFA) or pH adjustment were required.

Among all the species tested, an adverse effect (growth inhibition) was found only for the algae Selenastrum capricornutum. Six other freshwater algae, three marine algae and three freshwater aquatic plants were tested and no toxicity was found on none of the species at the highest concentrations tested (up to 2 g/L).

Three acute studies (one key and two supportives) and one chronic study (reproduction test) are available on Daphnia magna to assess the toxicity of TFA on invertebrates. No short term nor long term toxicity was observed for Daphnia magna as all studies had an EC50 (48h) greater than or equal to the highest concentration tested of 1000 mg/L and a chronic daphnid 21 d reproduction test performed up to a maximal concentration of 25 mg/L of TFA. While this value is taken as the NOEC for invertebrates it is not a true NOEC as no effect concentration was statistically calculated.

Two acute studies (one key and one supportive) are available on Danio rerio and no toxicity was observed at the highest concentrations tested. Therefore, an LC50 (96h) > 999 mg/L TFA was derived for the fish.

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