Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
3rd May 2005 - 4th May 2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The experimental procedure used complied with that specified in Method A5 of Commission Directive 92/69/EEC, and was carried out in accordance with GLP. The test material was well characterised.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2006
Report Date:
2006

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
The surface tension result was not correct using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and the ring assembly used in this test give a direct reading for the surface tens
GLP compliance:
yes
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Surface tension
Surface tension:
54.6 mN/m
Temp.:
20.5 °C
Conc.:
1.02 g/L

Any other information on results incl. tables

The calibration factor for doule-distilled water was generated using 7 surface tension readings at 20.4 -20.6oC and comparing to the literature values. The Mean calibration Factor was shown to be = 1.002.

Sample solution readings:

 Time (mins) Reading (mN/m)  Temperature (oC) 
57 54.0  20.4 
67  54.5  20.4 
76  54.5  20.4 
83  54.5  20.6 
89  54.5  20.4 
96  54.5  20.6 

Mean reading (last 5) : 54.5 mN/m

Surface tension = reading x calibration factor

= 54.5 x 1.002

= 54.6 mN/m

Temperature : 20.5 +/- 0.5 oC

pH of sample solution : 6.2

Applicant's summary and conclusion

Conclusions:
The surface tension of a 1.02 g/L solution of test material has been determined to be 54.6 mN/m at 20.5 degrees celsius. The test material is considered to be a surface-active material.
Executive summary:

Substances haveing a surface tension below 60 mN/m are regarded as being surface-active. Although the test material is surface active, for a test material to be classified as a true surfacant a value of below 40 mN/m should be obtained. This has been deemed to have no significant effect on the adsorption coefficient test ( section 5.4.1).

It is evident from the information obtained in the hydrolysis study (see section 5.1.2) and data relating to pH of the test material in water that negligable hydrolysis of the sample solution occurred during the course of the surface tension study.