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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2018-02-21 to 2018-06-02
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
31 May 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
43.48 mN/m
Temp.:
20.2 °C
Conc.:
90 vol%
Remarks on result:
other: RSD: 0.575%

The instrument was calibrated with 0.3, 0.5, and 0.8 g of standard weights. The surface tensions of standard weights were observed and recorded as 24.30, 40.60, and 65.40 mN/m, respectively, A calibration curve was drawn between the observed surface tension and the standard weights.

The surface tensions of water were observed and recorded as 72.60 and 72.80 mN/m for replicates R1 and R2, respectively. The literature value for the surface tension of water was divided by the measured surface tension of water.

The test item of 90% of saturation concentration of the solution was used for the analysis. Triplicate samples of the test item were prepared for the analysis and the values obtained were 43.71, 43.51, and 43.21 mN/m for replicates R1, R2 and R3, respectively. The calculated mean surface tension of the test item was determined to be 43.48 mN/m with RSD of 0.575% at 20.2 °C. 



    

      Table 1: Determination of surface tension of 
      test item 
    


    

      

        
Replication Number

        
Surface Tension of Test item (mN/m) (20.2 °C)

        
Water calibration Correction Factor

        
Corrected Surface Tension (mN/M)

        
Mean of Corrected Surface Tension (mN/m)

        
SD (±)

        
RSD (%)

      

      

        
1

        
43.70

        
1.0003

        
43.71

        
43.48

        
0.25

        
0.575

      

      

        
2

        
43.50

        
1.0003

        
43.51

      

      

        
3

        
43.20

        
1.0003

        
43.21

      

    

    

      SD: 
      Standard Deviation
    


    

      RSD: 
      Relative Standard Deviation
    
Conclusions:
The surface tension of the test item was determined to be 43.48 mN/m at 20.2 °C.
Executive summary:

      A test was 
      conducted according to OECD 115 and EU Method A.5 to determine the 
      surface tension of the test item using the ring method. 90 % saturated 
      solution of the test items solution was used for the analysis. 
      Triplicate samples were prepared for the analysis and tested. The values 
      obtained for the surface tension were 43.71, 43.51, and 43.21 mN/m for 
      each replicate, respectively. The calculated mean surface tension was 
      determined to be 43.48 mN/m with RSD of 0.575 % at 20.2 ºC.
    
Description of key information

      The surface tension of the test item was 
      determined to be 43.48 mN/m at 20.2 °C.
    
Key value for chemical safety assessment
Surface tension:
43.48
Additional information

      A test was 
      conducted according to OECD 115 and EU Method A.5 to determine the 
      surface tension of the test item using the ring method. 90 % saturated 
      solution of the test items solution was used for the analysis. 
      Triplicate samples were prepared for the analysis and tested. The values 
      obtained for the surface tension were 43.71, 43.51, and 43.21 mN/m for 
      each replicate, respectively. The calculated mean surface tension was 
      determined to be 43.48 mN/m with RSD of 0.575 % at 20.2 ºC.