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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The estimated 48-hour EC50 is 242 mg/L for fresh water invertebrates.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
242 mg/L

Additional information

Measured data are not available for the aquatic toxicity endpoints. In accordance with column 2 of REACH Annex VII and VIII, the acute toxicity tests do not need to be conducted if there are mitigating factors indicating that aquatic toxicity is unlikely to occur. Acetylene is a gas at standard temperature and pressure and is expected to partition primarily to air.

The ECOSAR model (Nabholz and Mayo-Bean 2009) has been used to calculate the likely toxicity of acetylene to aquatic organisms. The ECOSAR model is an appropriate QSAR model for Acetylene as it is based on a related chemical dataset that calculates the toxicity of neutral organic hydrocarbons whose mode of action is non-polar narcosis.