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Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
22 December 2017 - 07 June 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes
Type of method:
OECD harmonised ring method

Test material

Constituent 1
Chemical structure
Reference substance name:
(1R,3aS,3bR,9aR,9bS,11aS)-1-ethynyl-1-hydroxy-11a-methyl-1H,2H,3H,3aH,3bH,7H,8H,9H,9aH,9bH,10H,11H,11aH-cyclopenta[a]phenanthren-7-one
EC Number:
608-630-3
Cas Number:
31528-46-8
Molecular formula:
C20H24O2
IUPAC Name:
(1R,3aS,3bR,9aR,9bS,11aS)-1-ethynyl-1-hydroxy-11a-methyl-1H,2H,3H,3aH,3bH,7H,8H,9H,9aH,9bH,10H,11H,11aH-cyclopenta[a]phenanthren-7-one
Test material form:
solid: particulate/powder
Details on test material:
Appearance: Off-white powder
Test item storage: At room temperature

Results and discussion

Surface tension
Key result
Surface tension:
73.2 mN/m
Temp.:
20 °C
Remarks on result:
other: Conc. is 90% of test item saturation solubility in water

Any other information on results incl. tables

Calibration Experiments (with double distilled water)

Measurement

Time passed after transfer calibration solution to test vessel
[minutes]

Surface tension
(mN/m)

individual

mean

1

15

70.9

71.1

2

16

70.9

 

3

17

71.4

 

4

18

71.0

 

5

19

71.1

 

The calibration factor (Φb) was calculated to be 1.02.

Table: Surface tension measurements

Measurement

Time passed after transfer test solution to test vessel
[minutes]

Surface tension
(mN/m)

individual

mean

mean multiplied by
Φband Harkins-Jordan corrected value

1

15

71.8

71.8

73.2

2

16

72.0

 

 

3

17

71.5

 

 

4

18

72.0

 

 

5

19

71.5

 

 

Applicant's summary and conclusion

Conclusions:
The surface tension of an aqueous solution of the substance at 90% of its saturation solubility in water was determined to be 73.2 mN/m (at 20°C).