Registration Dossier
Registration Dossier
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EC number: 274-407-9 | CAS number: 70210-10-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (72 h) > 100 % saturated solution.
Key value for chemical safety assessment
Additional information
No data on the target substance was available, thus a read-across approach with a Similar Substance was used. The 2 substances are structural analogues. Details on the read across are reported in section 13.
Green algae were exposed to test substance according to OECD guideline 201. Effect parameters were growth rate and yield over a 72 h exposure period.
The study was conducted under static conditions with an initial cell density of 6839 cells/ml. A saturated solution with a nominal loading of 5.00 mg test item/l was prepared with dilution water 24 ± 1 hour prior to the start of the exposure and undissolved particles were removed by membrane filtration. The saturated solution was used in the test.
The saturated solution and four dilution levels out of the saturated solution were tested in the definitive test in a geometrical series with a dilution factor of 2: 6.25 - 12.5 - 25.0 - 50.0 - 100 % of the saturated solution. Three replicates were tested for each test item concentration and six replicates for the control.The test media were clear throughout the test period.
As for growth rate, an ErC50 > 100 % saturated solution was found.
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