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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The substance was not acutely toxic to Daphnia magna when tested according to OECD 202.  The calculated 24-h EC50 is 75 mg/L (nominal) with 95% CL of 65-90 mg/L.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
75 mg/L

Additional information

Acute toxicity to Daphnia magna was assessed according to OECD 202 in a study not following GLP procedures (Rufli, 1989). Daphnia were exposed under static conditions to the substance at a range of concentrations from 10, 18, 32, 58, or 100 mg/L in freshwater. The test was performed with 5 daphnia per vessel and 20 daphnia per concentration. For each concentration, the percentage of immobilisation at 24-hours was recorded. The test concentrations were not confirmed by analytical monitoring. The following OECD 202 validity criteria were met: immobilisation in the control did not exceed 10% at the end of the test, and concentrations of dissolved oxygen in the control and test vessels remained above 3 mg/L at the end of the test. The 24-h EC50 was calculated as the geometric mean of the EC0 (32 mg/L) and the EC100 (>100 mg/L).  Under the conditions of the test, the calculated 24-h EC50 was 75 mg/L, and the graphically determined 24-h EC50 was 76 mg/L.