Registration Dossier
Registration Dossier
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Reaction mass of Cobalt, 4-[4-[[4-[[[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1Hpyrazol-4-yl)azo]-4-hydroxyphenyl]sulfonyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulfonate 4-[4-[[4-[[[3-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-4-hydroxyphenyl]sulfonyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1Hpyrazol-1-yl]benzenesulfonate sodium complexes and Cobaltate(3-), bis[4-[4-[[4-[[[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxyphenyl]sulfonyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1Hpyrazol-1-yl]benzenesulfonato(3-)]-, trisodium and Cobaltate(5-), bis[4-[4-[[4-[[[3-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-4-hydroxyphenyl]sulfonyl]amino]phenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1Hpyrazol-1-yl]benzenesulfonato(4-)]-, pentasodium
EC number: 916-898-0 | CAS number: -
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (frond number, 7d) = 121.7 mg/l
ErC50 (dry mass, 7d) = 164.5 mg/l
Key value for chemical safety assessment
- EC50 for freshwater plants:
- 121.7 mg/L
Additional information
The acute toxicity of the test item to aquatic plants was investigated in a 7–day static test to Lemna minor, according to the OECD Guideline 221 (2006). The study was performed using 5 concentrations ranging from 4.6 to 100 mg/L. The frond number and the dry mass of each replicate were determined during the experiment. Growth rate µ and the yield were determined from the frond number and the dry mass at the respective observation times. The measured concentrations lay between 85 % and 106 %, at the beginning, 103 and 120 %, at the end, of the nominal concentrations. Thus, the determination of the results was based on the nominal concentrations. All the validity criteria were met.
The 7-day ErC50 vaue, based on frond number and dry mass, were found to be 121.7 mg/l and 164.5 mg/l, respectively.
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