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Short-term toxicity to aquatic invertebrates

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Description of key information

EL50 (48 h) = 2.4 mg/L (Daphnia) (freshwater)
LL50 (48 h) = 2.4 mg/L (Mysidopsis) (saltwater)

Key value for chemical safety assessment

Additional information

No studies are available on the acute toxicity to aquatic invertebrates for isoheptane. Based on an analogue approach data are read-across to another isoalkane substance, i.e. 2,3,4-trimethylpentane. A study on 2,3,4-trimethylpentane was conducted by Adema & van den Bos Bakker (1987) with three different species of freshwater and marine aquatic species including the genera Daphnia, Chaetogammarus, and Mysidopsis. The tests did not follow a standard test guideline, however, they were conducted similar to OECD 202. The acute toxicity, as measured by immobilisation of Daphnia and mortality to Chaetogammarus and Mysidopsis, was evaluated in fresh- and saltwater by using water accomodated fractions (WAFs). Under the conditions of these tests, 2,3,4-trimethylpentane produced acute toxicity to Daphnia and Mysidopsis at 2.4 mg/L and to Chaetogammarus at 5.4 mg/L based on nominal loadings of the test substance in water.