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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Link to relevant study record(s)

Description of key information

One proprietray and one published studt are available.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
1.3 mg/L

Additional information

A 21-day reproduction test was carried out in Daphnia magna to determine the NOEC for tributyl phosphate (Kuehn et al, 1989). Evaluation parameters for fixing the NOEC were parent animal mortality, reproduction rate and the appearance of the first offspring during the test period. Animals were aged 24 hours at the start of the test. A semi-static procedure was used with open vessels maintained under fluorescent lighting, animals were fed daily with algae suspension (the test was carried out in accordance with an FEA guideline). The 24 hour EC50 value was also determined. The NOEC was found to be 1.3 mg/l in the 21 day reproduction test.

The 21 day EC50 (immobilisation) of tributyl phosphate in Daphnia magna is also reported to be >2.1mg/l (ABC Laboratories, 1991).