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Long-term toxicity to aquatic invertebrates

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Key value for chemical safety assessment

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For risk assessment of ammonium bicarbonate the total topic of ammonia toxicity was regarded. Species mean chronic values (SMCV), as given by U.S. EPA (1999) were considered as relevant endpoints. The lowest species mean chronic value (EC10, adjusted to pH 8 and 25°C) was 0.66 mg N/L = 3.7 mg/L Ammonium hydrogencarbonate for Hyalella azteca (Borgmann 1994). The adjusted species mean chronic values at pH = 8 and 25 °C for reproduction tests in Daphnia magna and Ceriodaphnia dubia are:

-Daphnia magna: adjusted species mean EC20 = 12.3 mg N/l i.e. 69.4 mg/l ammonium hydrogencarbonate

-Ceriodaphnia dubia: adjusted species mean EC20 = 13.5 mg N/l i.e. 76.2 mg/l ammonium hydrogencarbonate

Conclusion:

The EC10 of 3.7 mg/L for Hyalella azteca represents the most sensitive species mean chronic value for the assessment of chronic toxicity of ammonium to aquatic organisms and has consequently been used for the derivation of PNEC freshwater.