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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:
27 June 2019 to 10 September 2019
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:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes
Type of method:
ring method
Key result
Surface tension:
55 mN/m
Temp.:
20 °C
Conc.:
23.6 mg/L

RESULTS AND DISCUSSION

- The surface tension of the test substance was determined at 20.0 ± 0.5 °C using a surface tensiometer.

- Prior to analysis, a water calibration correction factor was determined and applied to the initial instrument reading.

- The surface tension determination was performed in triplicate on two separate aliquots of the test substance.

- The corrected mean measured surface tension of the test substance was 55.0 ± 0.8 (n = 6, CV = 1.52 %) at 20 ± 0.5 °C.

- The results of the surface tension analysis are presented in Table 7 (attached).

Conclusions:
The surface tension of the test substance was determined using a surface tensiometer. The corrected mean measured surface tension was 55.0 ± 0.8 (n = 6, CV = 1.52 %) at 20.0 ± 0.5 °C and was measured at a concentration of 23.6 mg/L as test material.
Executive summary:

GUIDELINE

The investigation was performed in accordance with Organisation for Economic Cooperation and Development (1995) Guideline 115 "Surface Tension of Aqueous Solutions" and Council of the European Communities Directive 92/69/EEC(1992) Method A.5 "Surface Tension".

 

METHODS

The surface tension was determined using a surface tensiometer. The surface tension was obtained at a constant temperature of 20.0±0.5 °C, measured using a certified thermometer. The temperature was recorded immediately prior to analysis. This method utilised the principles of operation originally devised by Dr. Pierre du Nouy and employed a platinum-iridium ring of precisely known dimensions suspended from a counter-balanced lever arm. The arm was held horizontal by torsion applied to a taut stainless steel wire to which it was clamped. Increased torsion in the wire raised the arm and the ring. The ring carried with it the liquid in which it was immersed. Surface tension was measured as the force necessary to pull the test ring free from the surface film.

 

RESULTS

The surface tension of the test substance was determined using a surface tensiometer. The corrected mean measured surface tension was 55.0 ± 0.8 (n = 6, CV = 1.52 %) at 20.0 ± 0.5 °C and was measured at a concentration of 23.6 mg/L as test material.

Description of key information

The surface tension of the test substance was determined using a surface tensiometer. The corrected mean measured surface tension was 55.0 ± 0.8 (n = 6, CV = 1.52 %) at 20.0 ± 0.5 °C and was measured at a concentration of 23.6 mg/L as test material (OECD 115 and EU Method A.5).

Key value for chemical safety assessment

Surface tension:
55
in mN/m at 20°C and concentration in mg/L:
23.6

Additional information

GUIDELINE

The investigation was performed in accordance with Organisation for Economic Cooperation and Development (1995) Guideline 115 "Surface Tension of Aqueous Solutions" and Council of the European Communities Directive 92/69/EEC(1992) Method A.5 "Surface Tension".

 

METHODS

The surface tension was determined using a surface tensiometer. The surface tension was obtained at a constant temperature of 20.0 ± 0.5 °C, measured using a certified thermometer. The temperature was recorded immediately prior to analysis. This method utilised the principles of operation originally devised by Dr. Pierre du Nouy and employed a platinum-iridium ring of precisely known dimensions suspended from a counter-balanced lever arm. The arm was held horizontal by torsion applied to a taut stainless steel wire to which it was clamped. Increased torsion in the wire raised the arm and the ring. The ring carried with it the liquid in which it was immersed. Surface tension was measured as the force necessary to pull the test ring free from the surface film.

 

RESULTS

The surface tension of the test substance was determined using a surface tensiometer. The corrected mean measured surface tension was 55.0 ± 0.8 (n = 6, CV = 1.52 %) at 20.0 ± 0.5 °C and was measured at a concentration of 23.6 mg/L as test material.