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EC number: 701-196-7 | CAS number: -
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 26MAY2010-26MAY2010
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- ring method
- Remarks:
- though type of method not specifically mentioned, the type was deduced from the fact that the Harkins-Jordan correction was applied to the measured data
- Key result
- Surface tension:
- 29.9 mN/m
- Temp.:
- 20 °C
- Remarks on result:
- other: This is the average surface tension value obtained on two aqueous solutions of concentrations 277 and 239 mg/L.
- Conclusions:
- The surface tension of an aqueous test substance solution at ca. 250 mg/L and 20°C was found to be 29.9 mN/m, in accordance with EC A.5 and OECD 115 guidelines. Because the surface tension is < 60 mN/m, the substance is regarded to be surface active, following EC A.5 guideline.
Reference
Study results:
Water calibration: temp.= 26 degrees C, density = 0.997 g/cm3
Surface tension of purified water
Value 1: 71.4 mN/m
Value 2: 71.4 mN/m
Value 3: 71.4 mN/m
Value 4: 71.4 mN/m
Value 5: 71.4 mN/m
Value 6: 71 .5 mN/m
Arithmetic mean value: 71.4 mN/m; standard deviation: 0.1 mN/m (theoretical value: 71,6 mN/m, resulting a correction factor of 1.0028)
First test solution: (conc. =277 mg/L), temp.= 22 degrees C, density = 0.997 g/cm3; age of solution = 54 min.
Surface tension of solution 1
Value 1: 30.5 mN/m
Value 2: 30.5 mN/m
Value 3: 30.1 mN/m
Value 4: 29.9 mN/m
Value 5: 29.2 mN/m
Value 6: 29.6 mN/m
Arithmetic mean value: 30.0 mN/m; standard deviation 0.5 mN/m
Second test solution: (conc.=239 mg/L), temp.= 22 degrees C, density = 0.997 g/cm3; age of solution = 61 min.
Surface tension of solution 2
Value 1: 30.5 mN/m
Value 2: 29.9 mN/m
Value 3: 29.6 mN/m
Value 4: 29.4 mN/m
Value 5: 29.6 mN/m
Value 6: 29.3 mN/m
Arithmetic mean value: 29.7 mN/m; standard deviation 0.4 mN/m.
By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.
Arithmetic mean of two test solutions: 29.85 mN/m (+/- 0.21 mN/m)
Arithmetic mean value corrected by calibration factor determined via water calibration: 29.9 mN/m
Description of key information
The surface tension of an aqueous test substance solution at ca. 250 mg/L was found to be 29.9 mN/m at 20°C. Because the surface tension is < 60 mN/m, the substance is regarded to be surface active.
Key value for chemical safety assessment
- Surface tension:
- 29.9
- in mN/m at 20°C and concentration in mg/L:
- 250
Additional information
Determined in a study performed in accordance with OECD 115, using the ring method.
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