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Short-term toxicity to aquatic invertebrates

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Description of key information

The acute toxicity of ammonia was investigated in Daphnia magna. The 48 hour LC50 value for was determined to be 101 mg/L

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
110 mg/L

Additional information

The acute toxicity of ammonia was investigated in Daphnia magna. The 48 hour LC50 value for was determined to be 101 mg/L (with 95% confidence limits of 92.4 -110 mg/l) (Gersich & Hopkins 1986).

 

A series of toxicity studies were conducted exposing either Chironomous tentans or Lumbriculus variegatus to various concentrations of ammonium chloride (Schubauer-Bergan et al, 1995). For non-ionised ammonia, the lowest LC50 to L. variegatus was 0.455 mg/L at a pH of 6.3. The lowest endpoint for C. tentans was 0.72 mg/L at a pH of 6.52. For total ammonia, the lowest LC50 to L. variegatus was 6.6 mg/L at a pH of 8.59. The lowest endpoint for C. tentans was 82.4 mg/L at a pH of 8.53. Total ammonia was more toxic to both species with increasing pH. The degree of pH dependence of toxicity, however, was more pronounced for L.variegatus. The smaller pH dependence of total ammonia toxicity to C. tentans suggests that the ammonium ion contributes more significantly to the toxicity of total ammonia for this species.