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Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Description of key information

Most sensitive toxicity data for 8 different freshwater algae species are summarised in the EU-RAR (2008). According to these data, the effect concentrations (parameter: growth rate) for Nickel hydrogencitrate were calculated:
Scenedesmus accuminatus: NOEC (3d) = 0.039 mg Trinickel dicitrate/L
Desmodesmus spinosus: NOEC (3d) = 0.071 mg Trinickel dicitrate/L
Pediastrum duplex: EC10 (3d) = 0.063 mg Trinickel dicitrate/L
Chlamydomonas sp.: EC10 (3d) = 0.064 mg Trinickel dicitrate/L
Ankistrodesmus falcatus: EC10 (3d) = 0.042 mg Trinickel dicitrate/L
Chlorella sp.: EC10 (3d) = 0.132 mg Trinickel dicitrate/L
Coelastrum microporum: EC10 (3d) = 0.130 mg Trinickel dicitrate/L
Pseudokirchneriella subcapitata: EC10 (3d) = 0.80 mg Trinickel dicitrate/L
Most sensitive toxicity data for 4 different marine algae species (as cited in EU-RAR, 2008):
Macrocystis pyrifera: EC10 (48h, growth) = 0.305 mg Trinickel dicitrate/L
Champia parvula: EC10 (10d, reproduction) = 0.453 mg Trinickel dicitrate/L
Skeletonema costatum: EC10 (72h, specific growth rate) = 0.386 mg Trinickel dicitrate/L
Dunaliella tertiolecta: EC10 (72h, specific growth rate) = 56.302 mg Trinickel dicitrate/L
Lowest toxicity data for 2 different aquatic plant species (as cited in EU-RAR, 2008), effect parameter: growth
Lemna gibba: EC10 (7d) = 0.157 mg Trinickel dicitrate/L
Lemna minor: EC10 (7d) = 0.026 mg Trinickel dicitrate/L

Key value for chemical safety assessment

Additional information

Accepted data on chronic single-species toxicity tests resulting in accepted high quality reliable NOEC/L(E)C10 values (expressed as Ni) for freshwater algae are given in EU-RAR, 2008 (see attachment of key study record chap. 6.1.5). From the database, 58 individual NOEC’s (ranging between 12.3 (for the species Scenedesmus accuminatus) and 425 μg Ni/L for the algae species Pseudokirchneriella subcapitata were reported. Recalculated values are 0.039 mg Trinickel dicitrate/L for Scenedesmus accuminatus and 1.337 mg Trinickel dicitrate/L for Pseudokirchnerialla subcapitata. The data for Scendesmus accuminatus were shown in detail in the key study record of chapter 6.1.5. Further detailed data were given for Pseudokirchneriella subcapitata in a supporting study record, all other results were only summarized in the attached document of the mentioned key study record.

Accepted data on chronic single-species toxicity tests resulting in accepted high quality reliable NOEC/L(E)C10 values (expressed as total Ni concentration) for marine algae are summarized in the EU-RAR 2008, too. From the database, EC10 values for four species are reported, ranging from 97 μg Ni/L for growth of giant kelp (Macrocystis pyrifera) to 17891 μg Ni/L for growth of the dinoflagellate, Dunaliella tertiolecta. Expressed as Trinickel dicitrate the range was between 0.305 and 56.302 mg/L. The results are also only shown in an attached document of the key study record, since the original reports are not public available.

All reports for toxicity testing of Ni to aquatic plants (Lemna gibba and Lemna minor) are not public available. Nevertheless the results, given in the EU-RAR (2008) are reported here, because the data were taken in the EU-RAR for the PNEC derivation via the species sensitivity distribution method. Overall, six individual NOEC/L(E)C10 values, ranging between 8.2 and 80 µg Ni/L (0.026 mg and 0.252 mg Trinickel dicitrate/L, respectively) were stated.