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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Acutely toxic to aquatic invertebrates.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
7.59 mg/L

Additional information

To determine the toxicity of the substance to aquatic invertebrates, an acute toxicity studys with Daphnia magna was performed which was run under GLP according to EPA OPP 72-2 with flow-through conditions (GAF Chemicals Corp., 1991; report no. 164A-101A). The tst concentrations were analytically verified. Here, the 48 -h EC50 was 7.59 mg/l based on mean measured concentrations.

This result is supported by a GLP study following EU method C.2 using Daphnia magna (BASF AG, 1992; report no. 91/1784/50/1) . The animals were exposed under static conditions. Although analytical verifiying of the test item took place no recalculation of the nominal test concentrations is possible. The 48 -h EC50 was calculated to be 12.2 mg/L (nominal). With high probability, the EC50 value (48 h) falls between 1 mg/L and 10 mg/L. Within the chronic test (see IUCLID Ch. 6.1.4: BASF AG, 2003; report no. 01/0525/51/1), a 21 -d LC0 of 5 mg/l was found.

It can be concluded that NOP is acutely toxic to aquatic invertebrates.