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Short-term toxicity to aquatic invertebrates

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Description of key information

EL50 (48 h) = 3.9 mg/L (Daphnia) (freshwater)
LL50 (48 h) = 2.1 mg/L (Mysidopsis) (saltwater)

Key value for chemical safety assessment

Additional information

There are measured acute toxicity data available for heptane on four different species of freshwater and marine aquatic species including the genera Daphnia, Chaetogammarus, Mysidopsis, and Crassostrea (Adema & van den Bos Bakker 1987, Bringmann & Kühn 1977, Legore 1974). However, due to significant methodological deficiencies in some works only the data provided by Adema & van den Bos Bakker (1987) are considered reliable. The tests conducted by the latter authors did not follow a standard test guideline. However, test 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, Normal-Heptane produced acute toxicity to Daphnia at 3.9 mg/L, to Chaetogammarus at 3.1 mg/L, and to Mysidopsis at 2.1 mg/L based on nominal loadings of the test substance in water.