Registration Dossier
Registration Dossier
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reaction mass of: pentasodium bis[6-anilino-3,5'-disulfonatonaphthalene-2-azobenzene-1,2'-diolato]cobaltate(III);tetrasodium [6-anilino-3,5'-disulfonatonaphthalene-2-azobenzene-1,2'-diolato][6-anilino-5'-sulfamoyl-3-sulfonatonaphthalene-2-azobenzene-1,2'-diolato]cobaltate(III);trisodium bis[6-anilino-5'-sulfamoyl-3-sulfonatonaphthalene-2-azobenzene-1,2'-diolato]cobaltate(III)
EC number: 444-290-0 | CAS number: 508202-43-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (72 h) = 42.6 mg/l
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 42.6 mg/L
Additional information
The acute toxicity of the test item to aquatic algae and cyanobacteria was investigated in a 96 –hour static test to Scenedesmus subspicatus, according to the OECD Guideline 201 (1984) and the method C.3 of EEC-Directive 92/69 EEC. The test method was modified to quantify the algicidal effect of the test item, but also the growth inhibition effect caused by reduced light intensities in the coloured test solutions. The nominal test concentrations ranged from 0.38 to 120 mg/l in parallel with a control.
The growth inhibition effect on Scenedesmus subspicatus was caused in part by the indirect effect (the light absorption in the coloured test solutions). At the higher test concentrations a real toxic effect of the test item on the growth cannot be excluded.
The ErC50 (72 h) for algicidal effect was found to be 42.6 mg/l.
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