Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Measured data are not available for the terrestrial toxicity endpoints. In accordance with column 2 of REACH Annex IX and X, the terrestrial toxicity tests do not need to be conducted if direct and indirect exposure of the soil is unlikely to occur. Butenes are gases at standard temperature and pressure and is expected to partition primarily to air, therefore terrestrial toxicity tests are not required.

In the absence of measured data, the ECOSAR model (ECOWIN v1 ECOSAR, Nabholz and Mayo-Bean 2009) has been used to calculate the toxicity of butenes to earthworms. The ECOSAR model is a reliable and appropriate QSAR model to apply 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. The endpoint calculated here is therefore a reasonable estimate of their baseline toxicity.