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EC number: 204-066-3
CAS number: 115-11-7
The calculated earthworm 14 day LC50 for butenes range from 92.4 mg/kg soil dw to 95.5 mg/kg soil dw. This range was derived from the members of the butenes category: but-1-ene (CAS 106-98-9), 2-butene (CAS 107-01-7) and 2-methylpropene (CAS 115-11-7) using QSAR estimates (Nabholz and Mayo-Bean 2009).
Butenes are gases at standard temperature and
pressure and are expected to partition primarily to air; therefore
terrestrial toxicity tests may not be relevant. In addition, it is
technically difficult to maintain terrestrial concentrations of gases
for toxicity testing.
Measured data are not available for butenes
for this endpoint. Due to the practical difficulties associated with the
ecotoxicity testing of gases (i.e. maintaining exposure concentrations),
the use of QSAR toxicity estimates is an appropriate alternative. The
ECOSAR model is a reliable and appropriate QSAR model to apply to
butenes 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 its baseline toxicity.
A QSAR (ECOWIN v1 ECOSAR, Nabholz and
Mayo-Bean 2009) has been used to give an indication of the toxicity of
butenes to the earthwom. The calculated 14 day LC50 are 93.7 mg/kg soil
dw for but-1-ene, 95.5 mg/kg soil dw for 2-butene and 92.4 mg/kg soil dw
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