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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:
01 September 2015 - 27 October 2015
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
no
Remarks:
No formal claim. Study conducted in a facility operating to GLP.
Type of method:
ring method
Key result
Surface tension:
72.7 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Table 3 Water Calibration Data relevant To Sample Solution A

 Reading (mN/m)  Temperature (ºC)  Literature Value (mN/m)  Calibration Factor
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
 73.0  20.0  72.72  0.996
     Mean Calibration Factor:  0.996 (1)

(1) Calculated using the last six calibration factor values which bracket the sample solution reading values used in the definitive test result.

Table 4 Water Calibration Data relevant To Sample Solution B

 Reading (mN/m)  Temperature (ºC)  Literature Value (mN/m)  Calibration Factor
 72.5 20.0  72.72  1.003
 73.0 20.0  72.72  0.996
 73.0 20.0  72.72  0.996
 73.0 20.0  72.72  0.996
 73.0 20.0  72.72  0.996
 73.0 20.0  72.72  0.996
 73.0 20.0  72.72  0.996
    Mean Calibration Factor:   0.996 (1)

(1) Calculated using the last six calibration factor values which bracket the sample solution reading values used in the definitive test result.

Table 5 Sample Solution A Surface Tension Measurements

Time (mins)  Temperature (°C)  Reading (mN/m)
 69  20.0 72.5
 93  20.0 73.0
 117  20.0 73.0
 142  20.0 73.0
 165  20.0 73.0
 189  20.0 73.0
   Mean Sampling Reading:    73.0 (1)

(1) Last five values considered to be a stable plateau of surface tension readings and therefore used in the calculation of the mean.

Table 6 Sample Solution B Surface Tension Measurements

Time (mins)  Temperature (°C)  Reading (mN/m)
 81 20.0 72.5
 105 20.0 73.0
130 20.0  73.0
 154 20.0  73.0
 177 20.0  73.0
 201 20.0  73.0
    Mean Sampling Reading:  73.0 (1)

(1) Last five values considered to be a stable plateau of surface tension readings and therefore used in the calculation of the mean.

Conclusions:
In a reliable and conclusive study according to OECD TG 115 (1995) and EU Method A5 (2008), the average surface tension of duplicate solutions of the test item in water has been determined to be 72.7 mN/m at 20.0 ± 0.5 °C.
Executive summary:

The determination of the surface tension of an aqueous solution of the test item was based on the OECD Guideline No. 115 "Surface Tension of Aqueous Solutions" (1995). The surface tension of test item in water was determined according to the ring method to be 72.7 mN/m at 20.0 ± 0.5 °C.

Description of key information

The determination of the surface tension of an aqueous solution of the test substance was based on the OECD Guideline No. 115 "Surface Tension of Aqueous Solutions" (1995). The surface tension of test substance in water was determined according to the ring method to be 72.7 mN/m at 20.0 ± 0.5 °C.

Key value for chemical safety assessment

Surface tension:
72.7
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information