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Long-term toxicity to aquatic invertebrates

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Description of key information

A 29 d NOEC of 0.066 mg NH3/l has been reported for toxicity of ammonia to the aquatic invertebrate Deleatidium sp.

Key value for chemical safety assessment

Additional information

Testing for long-term toxicity to invertebrates is not considered necessary because:

- Short-term toxicity of the the silanol hydrolysis product, trimethylsilanol, to invertebrates is low.

- The risk characterisation ratio (RCR) based on PNECaquatic derived from the short-term data is <1 (see Section 10 of the CSR).

- For the hydrolysis by-product, ammonia, reliable chronic data are available.

- The substance is used under highly controlled conditions and, therefore, exposure of the aquatic environment is low (see Section 9 for further details).

Reliable long-term data are available sourced from the Environment Agency Proposed EQS for Water Framework Directive Annex VIII Substances: Ammonia (unionised) 2007. A 29 d NOEC of 0.066 mg NH3/l has been reported for toxicity of ammonia to the aquatic invertebrate Deleatidium sp. (Champ et al, 1977).