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EC number: 203-710-0
CAS number: 109-83-1
This endpoint is not expected to be an importent environmental fate for N-Methylethanolamine. Two different calculation methods were used to estimate the logPow and Pow value of the substance. KOCWIN will only take the uncharged molecule into account, whereby the calculation method according to Franco and Trapp considers the ionic structure at different pH values.
Considering the low logPow (-0.91) the adsorption / desorption won´t be
an important environmental fate for the substance N-Methylethanolamine.
In additon, the chemical is readily biodegradable. Due to this
assumption, experimental data are not necessary for this endpoint. A
calculation was performed with the help of the US-EPA computer tool
EPIWIN (software KOCWINv2.00) to receive a first indication for the
adsorption / desorption properties of N-Methylethanolamine. The MCI
method gives a Koc value of 1.303 L/kg, whereby the traditional method
shows a value of 0.8915 L/kg. The MCI method is taken more seriously
into account, due to the fact that it uses correction factors. The
traditional method is estimation from the logPow value. The data of this
calculation tool refer to the uncharged molecule. Since
N-Methylethanolamine possess a pKa value of 9.95, it will exist almost
completely as a cation in the environment. Cations generally adsorb
stronger to soil containing organic carbon and clay than their neutral
counterparts. Hence, the KOCWIN model may underestimeate adsorption to
organic carbon since it does not consider the ionic structure of the
For this reason another calculation approach was used: according to
Franco and Trapp the logKoc (as well as the Koc) value will not change
at a range from pH 5 to pH 9. This indicates that for the substance
N-Methylethanolamine the surrounding pH will not have a great influence
on its adsorption coefficients.
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