Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Measured ecotoxicity 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. 1,3 -Butadiene is a gas at standard temperature and pressure and is expected to partition primarily to air, therefore aquatic toxicity tests may not be relevant. In addition, it is technically difficult to maintain aqueous concentrations of gases for toxicity testing. Therefore, in the absence of measured data, the toxicity of 1,3-butadiene has been estimated using two suitable QSARs described below. The equations used are suitable for non-polar narcotic chemicals. The endpoints calculated here are therefore a reasonable estimate of the baseline toxicity of 1,3-butadiene.