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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The ErC50(72h) for Desmodesmus subspicatus was determined as 26 mg/L and the NOECr(72h) as 6 mg/L, respectively.

Key value for chemical safety assessment

EC50 for freshwater algae:
26 mg/L
EC10 or NOEC for freshwater algae:
6 mg/L

Additional information

An acute toxicity study was conducted with Desmodesmus subspicatus (Safepharm Laboratories, 2007) according to OECD Guideline 201 using a static design. Nominal exposure concentrations were 6.25; 12.5; 25; 50 and 100 mg/L. The test concentrations were prepared by diluting a saturated solution prepared from an initial test material dispersion at 1000 mg/L. Based on measured test concentrations (geometric mean) the 72-hour EC50 value for growth rate was determined to be 26 mg/L, the respective 72-hour NOEC was determined to be 6 mg/L.

Supporting study:

An acute toxicity study was conducted with Scenedesmus subspicatus (BASF AG 1995) according to OECD Guideline 201 using a static design. Nominal exposure concentrations were 6.25; 12.5; 25; 50 and 100 mg/L. The analytical recovery after after 0 hours was 24.8 - 30.6% in all analysed test solutions and after 72 hours below detection limit. No significant effects on growth were observed up to the highest concentration tested. The 72-hour EC50 value for growth rate is therefore > 100 mg/L of the nominal concentration.