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EC number: 210-519-6 | CAS number: 617-52-7
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Assessment bases on higher aquatic plant growth inhibition, due to known strong effects to terrestrial higher plants
Key value for chemical safety assessment
Additional information
No experimental data on growth inhibition of algae are available and testing on algae, required in Annex VII, column 1, section 9.1.2., has been waived in accordance with Annex XI, 2 (as the submission item is unstable) in combination with column 1 considerations in that toxicity to another aquatic plant (i.e. duckweed) was tested instead. However algae are generally preferred, the choice of duckweed as an aquatic higher plant was required as literature data indicated significant effects of the submission item to the photosynthesis apparatus of higher (terrestrial) plants (Jordanov & Karanov 1977; Karanov, Vasilev and Pogoncheva 1975; Karanov, Vasilev & Hristova 1975 - these results are reported in the terrestrial toxicity section). Therefore the growth inhibition of the submission item on aquatic plants was tested according to OECD TG 221 using duckweed (Lemna minor) as test organism instead of algae (see chapter “Toxicity to aquatic plants other than algae”). The results of this study were used to assess effects to the first aquatic trophic level.
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