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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Aquatic toxicity studies of fatty acids, C9-13-neo, copper salts are not available. Thus, read-across to the assessment entities soluble copper substances and neodecanoic acids, as structural analogue of fatty acids, C9-13, neo, is applied since the ions of fatty acids, C9-13-neo, copper salts determine its fate and toxicity in the environment. Reliable studies indicate that the moiety of ecotoxicological concern are copper cations. Based on copper toxicity to freshwater algae, species mean NOEC values of 43 µg/L Cu for Pseudokirchernella subcapitata and 138 µg/L Cu for Chlorella vulgaris were reported. In addition, with copper being an essential element to algae and cyanobacteria, a concentration of 1-35 µg/L Cu was determined as optimal concentration range for algal growth. Individual NOECs available for marine diatom species Phaeodactylum tricornutum and macroalgae Macrocystis pyrifera range from 2.9 µg Cu/L to 50 µg Cu/L, respectively with species-mean NOEC values ranging from 2.9 µg/L Cu (Phaeodactylum tricornutum) to 11 µg/L Cu (Fucus vesiculosis). Data for neodecanoic acid (structural analogue of fatty acids, C9-C13-neo) point to a low toxic potential to freshwater algae with a 72-h EL50 of >100 mg/L based on inhibition of growth of R. subcapitata.

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