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EC number: 947-751-9 | CAS number: -
The readings and temperatures for the sample solutions are shown in the following table:
Table1: Surface tension values
1.002 x 104
3.205 x 103
1.068 x 103
Mean surface tension values were based on the last three readings for a particular concentration which were considered to be constant.
The concentration (mg/L), log10 [concentration (mg/L)] and mean surface tension values for the sample solutions are shown in the following table:
Table 2: The concentration (mg/L), log10 [concentration (mg/L)] and mean surface tension values
Mean Surface Tension (mN/m)
The plot of log10 [concentration (mg/L)] versus surface tension (mN/m) was drafted. For graph, kindly refer the attached background material section.
Line 1 (red) was generated from linear regression of 4 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 = -19.0 x + 70.7
Line 2 equation: y = -4.94 x + 49.0
The sample solution at 32.05 and 96.16 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.
The sample solutions at 0.3205 and 0.09616 mg/Lwere 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 be 34.8 mg/L.
A study was conducted to determine the critical micelle concentration (i.e., water solubility equivalent for surfactants) of the test substance by determining the surface tension of a range of aqueous sample solutions of differing concentration, according to OECD Guideline 115 and EU Method A.5. 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 the study conditions, the CMC or water solubility of the test substance was determined to be 35 mg/L at 20.0 ± 0.5°C (Envigo, 2018).
The water solubility of the test substance was determined based on critical micelle concentration (a water solubility equivalent of surfactant), according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).
Water solubility: 35 mg/L (based on CMC)
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