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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

ErC50 (72h) > 100 mg/L for Desmodesmus subspicatus (OECD 201)
NOErC (72h) > 10 mg/L for Desmodesmus subspicatus (OECD 201)

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
10 mg/L

Additional information

The toxicity of Sodium methyl cocoyl taurate to the unicellular freshwater green alga Desmodesmus subspicatus was determined according to the principles of OECD 201 (Scheerbaum, 2013). The study was conducted under static conditions with an initial cell density of 4E+03 cells/mL. Based on a preliminary test 5 concentration levels were tested in a geometrical series with 1.00, 3.16, 10.0, 31.6 and 100 mg/L nominal concentrations. Three replicates were tested for each test item concentration and six replicates for the control. Environmental conditions were determined to be within the acceptable limits.

The concentrations of Sodium methyl cocoyl taurate were analytically verified by LC-MS/MS at test start and test end of all test concentrations and the control. The measured concentrations of the active ingredient of Sodium methyl cocoyl taurateat test start were in the range of 105 to 111 % and after 72 hours in the range of 111 to 114 % of the nominal values. Therefore, all effect values given are based on the nominal test item concentrations Sodium methyl cocoyl taurate. The NOEC/EC50 for growth inhibition after 72 hours was calculated as 10 and > 100 mg/L (nominal), respectively.