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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

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Description of key information

Aquatic toxicity studies of copper naphthenate arenot available. Thus, read-across to the assessment entities soluble copper substances and naphthenic acid is applied since the ions of copper naphthenate determine its fate and toxicity in the environment. Reliable studies indicate that the moiety of ecotoloxicological concern are copper cations. Regarding copper toxicity in aquatic environments, a large set of data is available including multiple studies on Ceriodaphnia dubia and Daphnia magna as summarized in the attached report “Derivation of acute Ecotoxicity Reference Values (ERVs) for copper” with species-specific geometric mean E(L)C50 values ranging from 12.6 to 40.0 microg Cu/L and 16.3 to 66.2 microg Cu/L, respectively. Data for naphthenic acid point to a moderate toxic potential to freshwater and marine invertebrates with a 48-h LC50 of 20 mg/L naphthenic acid (measured) for Daphnia magna and a 96-h LC50 of 4.8 mg/L calcium naphthenate for the marine copepod, Nitocra spinipes.

Key value for chemical safety assessment

Additional information