Registration Dossier
Registration Dossier
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EC number: 263-000-1 | CAS number: 61788-71-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Aquatic toxicity studies of naphthenic acids, nickel salts are not available. Thus, read-across to the assessment entities soluble nickel substances and naphthenic acid is applied since the ions of naphthenic acids, nickel salts determine its fate and toxicity in the environment. Reliable studies indicate that the moiety of ecotoxicological concern are nickel cations. Nickel toxicity data are available for many algal pecies and EC50 values range from 58.8 µg Ni/L for Chlamydymonas species (Deleebeeck et al., 2009a) to 52300 µg Ni/L for Anacystis nidulans (Azeez and Banerjee, 1991). Respective NOEC/EC10 values range from 12.3 μg Ni/L for Scenedesmus accuminatus (Deleebeeck et al., 2009a) to 425 μg Ni/L for Pseudokirchneriella subcapitata (Deleebeeck et al., 2009b). Data for naphthenic acid point to a low toxic potential to freshwater algae with 72-h NOErC and ErC50 values of 7.38 and 29.6 mg/L (measured dissolved), respectively, for the inhibition of growth rate of Pseudokirchneriella subcapitata.
Key value for chemical safety assessment
Additional information
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