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EC number: 204-066-3
CAS number: 115-11-7
The results of the QSAR predictions for the butenes category (but-1-ene (CAS 106-98-9), 2-butene (CAS 107-01-7) and 2-methylpropene (CAS 115-11-7)) indicate that they are expected to degrade rapidly, with estimated half lives of 2.8 days, 2 day and 2 days for each of the isomers respectively.
The results of the QSAR predictions for the
butenes category (but-1-ene (CAS 106-98-9), 2 -butene (CAS 107-01-7) and
2-methylpropene (CAS 115-11-7)) indicate that they are expected to
degrade rapidly, with estimated half lives of 2 days to 2.8 days for the
isomers. These results indicate that they would not meet the criteria
for persistent in the PBT assessment and do not indicate the potential
for long term effects in the environment for the classification and
As the butenes are gases at standard
temperature and pressure, conducting a standard ready biodegradability
test is technically difficult and, based on exposure estimates, the test
may not be relevant. Therefore, the use of a QSAR to predict the
biodegradability of the butenes category members is an appropriate
technique to use a part of a weight of evidence approach. The use of
BioHCwin v 1.01 (Howard et al. 2005) and Biowin v 4.1 (Howard et al.
1992) is appropriate for the butenes as these compounds clearly fall
within the applicability domains of these models as all substructures in
butenes category are included in the models. The results from both QSAR
models indicate that butenes are expected to biodegrade rapidly.
In addition, various researchers have
isolated micro-organisms that are capable of metabolising but-1-ene
(e.g. Hou et al. 1983). Although this study does not follow standard
guidelines for ready biodegradability tests, it does demonstrate that
micro-organisms can biodegrade butenes in aerobic conditions. This
review adds to the weight of evidence that members of the butenes
category can be expected to biodegrade if released to the environment.
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