6,8-dimethylnon-7-enal

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

disregarded due to major methodological deficiencies

Study period:

6-10 August 2010

Reliability:

3 (not reliable)

Rationale for reliability incl. deficiencies:

unsuitable test system

Remarks:

The determination was conducted on the neat substance, which does not comply with guideline requirements.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

neat substance

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Remarks:

effective 24 July 2009 (validity 18 months)

Type of method:

ring method

Remarks:

Dunouy tensiometer

Test material

Test material information

Constituent 1

Reference substance name:

7-nonenal, 6,8-dimethyl-, (6S)

Cas Number:

899810-99-2

Molecular formula:

C11 H20 O

IUPAC Name:

7-nonenal, 6,8-dimethyl-, (6S)

Constituent 2

Reference substance name:

7-nonenal, 6,8-dimethyl-,(6R)-

Cas Number:

899810-91-4

Molecular formula:

C11 H20 O

IUPAC Name:

7-nonenal, 6,8-dimethyl-,(6R)-

Test material form:

liquid

Details on test material:

- Physical state: colourless translucent liquid
- Storage condition of test material: Room temperature

Specific details on test material used for the study:

Storage conditions of test material: Stored at room temperature protected from direct sun light.

Results and discussion

Surface tension

Key result

Surface tension:

29.1 mN/m

Temp.:

20 °C

Any other information on results incl. tables

Test with acetone at 20 °C:

Corrected surface tension = 24.03 mN/m

Known value = 23.70 mN/m

Percent error = + 1.4 %

 

Test with demineralised water at 20 °C

Corrected surface tension = 72.94 mN/m

Known value = 72.88 mN/m

Percent error = +0.1 %

 

The raw data are reported here after of time evolution of the surface tension for neat item at 20 °C.

Table 4.10/1: Surface tension results

 

No	Time	Temperature	Measure
1	0 min 59 sec	20.1 °C	32.5 mN/m
2	3 min 52 sec	20.2 °C	32.4 mN/m
3	6 min 11 sec	20.2 °C	32.4 mN/m
4	8 min 25 sec	20.2 °C	32.4 mN/m

 

Mean value was calculated as 32.46 mN/m as mean from tests 2 to 4.

Surface tension at 20 °C = 29.1 mN/m

With f (correction factor) = 1.001722, F = 0.89668 and D = 0.848 g/mL

Applicant's summary and conclusion

Executive summary:

The surface tension of the test substance was determined under GLP according to EU A5 guideline, using Dunouy ring tensiometer method.

 

After calibration with water and acetone, 4 measurements were recorded on the neat item at 20 °C. Results were found stable overtime, so the average value was retained.

 

The surface tension of test substance was 29.1 mN/m at 20 °C.