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EC number: -
CAS number: -
The readings and temperatures for the
sample solutions are shown in the following table:
1.015 x 103
Mean surface tension values were based
on the last three readings for a particular concentration which were
considered to be constant.
and mean surface tension values for the sample solutions are shown in
the following table:
Mean Surface Tension (mN/m)
The plot of log10[concentration
(mg/L)] versus surface tension (mN/m) can be found under 'Attached
background materials' :
In this graph, line 1(red) was
generated from linear regression of 5 sample solution concentrations for
which the surface tension was shown to be concentration dependent and
line 2 (green) was generated from linear regression of 3 sample solution
concentrations for which the surface tension was observed to be
essentially independent of concentration.
The intersection of these two lines
gave the critical micelle concentration and was calculated by solving
the two equations:
Line 1 equation: y =-29.6x
Line 2 equation: y =-1.49x +34.4
sample solution at30.44 mg/L was not used in generating the two
lines. At this concentration the surface tension appeared to be
transitioning to Line 2 at a shallower gradient than Line 1.
sample solution at1.015 mg/L was not used in generating the two
lines. At this concentration the surface tension was only slightly
affected and was approaching that of purified water.
The CMC was determined to be25.0mg/L.
A study was conducted to determined the
water solubility of the test substance, C10-12 and C18-unsatd. DEA,
based on critical micelle concentration (CMC), according to OECD
Guideline 115 and EU Method A.5, in compliance with GLP. Due to the
surface activity of the test substance, the CMC value was considered as
a water soluibility equivalent in accordance with the ECHA R.7a
Guidance. Under study conditions, the CMC of the test substance was
determined to be 25
mg/L at 20.0 ± 0.5°C (Envigo, 2018).
water solubility of the test substance was determined based on the
critical micelle concentration (a water solubility equivalent of
surfactant), according to OECD Guideline 115 and EU Method A.5 (Envigo,
(based on CMC)
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