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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-03-09 to 2010-03-09
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study completed in accordance with the test method A.5 Surface Tension as desribed in the Official Journal of the European Communities L383A similar to OECD guideline 115.
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Surface tension:
72.3 mN/m
Temp.:
23 °C
Conc.:
1 g/L

Study Results

Water calibration : Temperature = 24 deg C, density = 0.997 g/cm3

Surface tension of purified water

  Surface Tension/mN/m 
Measurement 1   71.3
Measurement 2   71.2
Measurement 3   71.2
Measurement 4   71.1
Measurement 5   71.1
Measurement 6   71.1
Arithmetic mean  71.1 
Standard deviation  0.1 

Theoretical value : 72.0 mN/m ; correction factor 1.0127

First Test Solution

Concentration = 0.9990 g/L, Temperature = 24 deg C, Density = 0.997 g/cm3, Age of solution = 4 minutes

  Surface Tension/mN/m 
Measurement 1  71.3 
Measurement 2  71.3 
Measurement 3  71.3 
Measurement 4  71.2 
Measurement 5  71.2 
Measurement 6  71.2 
Arithmetric mean  71.2 
Standard deviation  0.1 

Second Test Solution

Concentration = 1.001 g/L, Temperature = 23 deg C, density = 0.997 g/cm3, Age of solution = 14 minutes

  Surface Tension/mN/m 
Measurement 1  71.6 
Measurement 2  71.6 
Measurement 3  71.6 
Measurement 4  71.6 
Measurement 5  71.5 
Measurement 6  71.5 
Arithmetic mean  71.6 
Standard deviation  0.0 

Third Test Solution

Concentration = 0.9992 g/L, Temperature = 23 deg C, density = 0.997 g/cm3, Age of solution = 22 minutes

  Surface Tension 
Measurement 1  71.4 
Measurement 2  71.4 
Measurement 3  71.4 
Measurement 4  71.4 
Measurement 5  71.3 
Measurement 6  71.3 
Arithmetic mean  71.4 
Standard deviation  0.0 

By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.

Arithmetic mean of three test solutions : 71.4 mN/m (+/- 0.2 mN/m)

Arithmetic mean corrected by calibration factor determined via water calibration : 72.3 mN/m

Remarks : The solution has a coloration (magenta) in the area of the platinum ring.

Conclusions:
The surface tension of a 1 g/L aqueous solution of N,N-Bis(2-hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined to be 72.3 mN/m at a temperature of 23 deg C.
Executive summary:

The surface tension of the test item N,N-Bis(2 -hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined in accordance with the test method A.5 'Surface Tension' as described in the Official journal of the European Communities L383A similar to OECD guideline 115. The surface tension of a 1 g/L aqueous solution of N,N-Bis(2-hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined to be 72.3 mN/m at a temperature of 23 deg C.

Description of key information

The surface tension of a 1 g/L aqueous solution of N,N-Bis(2-hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined to be 72.3 mN/m at a temperature of 23 deg C.

Key value for chemical safety assessment

Surface tension:
72.3
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of the test item N,N-Bis(2 -hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined in accordance with the test method A.5 'Surface Tension' as described in the Official journal of the European Communities L383A similar to OECD guideline 115. The surface tension of a 1 g/L aqueous solution of N,N-Bis(2-hydroxyethyl)-p-phenylenediamine sulphate monohydrate was determined to be 72.3 mN/m at a temperature of 23 deg C.