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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

EC50 (48h) = 8.18 mg/l, as measured concentration of a.i., in daphnia magna

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
8.18 mg/L

Additional information

As no data on the target substance was available, a read across approach was followed, using available data on Similar Substance 01. Details on the read-across are attached in section 13.

Acute toxicity of test substance to daphnia magna was determined in a 48-hour static test according to OECD guideline 202.

Nominal concentrations tested were 219, 99.8, 45.3, 20.6 and 9.37 mg/l a.i. based on a sample of ca. 73.15 % purity. Each concentration was tested in duplicate, using 20 daphnids per vessel. A negative control was run in triplicate, using 20 daphnids per vessel.

Based on concentrations measured by HLPC at 0 h, test substance resulted as partially soluble in daphnia medium. However, it was found to be stable over the 48 h test period. Geometric mean of measured concentrations at 48 h were: 42.1, 12.0, 5.95, 3.37 and 1.85 mg/l, corresponding to 97 - 101 % of the 0 h value. After 48 h, immobilisation rates were: 87.5 % at 219 mg/l, 77.5 % at 99.8 mg/l, 55 % at 45.3 mg/l and no significant at lower concentrations.

An EC50 (48h) value of 8.18 mg/l as mean measured concentration of a.i. was determined.