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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

OECD 211, GLP, key study, reliability 1:
- 21d NOEC reproduction = 0.076 mg Al/L, corresponding to 1.28 mg/L of AlNH4(SO4)2.12H2O (aluminium ammonium bis(sulfate))
- 21d NOEC immobilisation = 0.137 mg Al/L, corresponding to 2.30 mg/L of AlNH4(SO4)2.12H2O (aluminium ammonium bis(sulfate))

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater invertebrates:
1.28 mg/L

Additional information

One key study is available, according to OECD Guideline 211 with GLP statement, to assess the inhibition effect of Aluminium powder on the reproduction of the fresh water crustacean Daphnia magna. The test animals were exposed to 7 concentrations of the aqueous medium from a transformation/dissolution (T/D) test of aluminium powder. Chemical analysis of test solutions showed that the dissolved aluminium concentration in the T/D medium at the end of the 28 days T/D test was 1083 µg/L. Chemical analysis of test solutions prepared from the T/D medium showed on average 30% lower than nominal concentrations, which probably is an effect of a drop in pH from 8.5 to approximately 8.0 when the medium is in equilibrium with air. The Daphnia magna reproduction test showed that NOEC for effect on reproduction was 10% of the T/D medium. The nominal concentration of dissolved aluminium at this concentration was 108 µg/L. However, analyses of the test solutions showed that the actual concentrations on average were 70% of the nominal which gives a NOEC reproduction = 76 µg Al/L (corresponding to 1.28 mg AlNH4(SO4)2.12H2O /L). All adult animals were immobilised at 32% but none at 18% T/D solution. This implies that the NOEC immobilisation (21 days) was 18% T/D medium corresponding to NOEC immobilisation = 137 µg Al/L (=2.30 mg AlNH4(SO4)2.12H2O /L).

One non standard study is also available, to assess the the toxicity of AlCl3 to Daphnia magna. The study is considered as not assignable because if the methodology is scientifically acceptable, crucial information is missing in the report.