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EC number: 604-569-1
CAS number: 147126-62-3
The results showed that at 30° and 50°C, the
test substance degraded into products similar to those observed during
exposure to water. None of the starting material, as indicated by a peak
at 5.5 minutes in the HPLC chromatogram, was observed.
The crystalline material in the saturation
tube was analyzed to determine whether this material had also degraded.
The. results showed that it had not, indicating that the degradation
occurred while in the vapour state.
An estimate of the amounts of
material"present in the vapour was made by calibrating the HPLC
using samples of the test substance deliberately degraded in water. These
values were used to estimate the vapour pressure. These results are
summarized in Table 13. Raw data can be found in Appendix 2.
The measurements show that the test
substance displays a vapour pressure of 3.53 Pa
at 30°C and 4.14 Pa at 50°C. This
result is based on an estimate of the amounts of degradation products
present in the imp Inger solutions and assumes that the breakdown
products in vapour are the same as occur in water. There was some carryover
into the second impinger in each case, but given the nature of the
breakdown occurring in the vapour phase, this was not further
investigated. Given these analytical uncertainties, the reported vapour
pressure must be. considered a crude estimate. Further refinement of the
value, would require a significant level of effort beyond the scope of
the OECD method.
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