[No public or meaningful name is available]

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Testing was conducted between 16 May 2008 and 02 July 2008.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Principles of method if other than guideline:

The determination was carried out using a White Electrical Institute interfacial tension balance and a procedure based on the ISO 304 ring method. With the exception of the following deviation, the experimental procedure used complied with that specified in Method A5 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC).

GLP compliance:

yes (incl. QA statement)

Remarks:

The work described was performed in compliance with UK GLP standards (Schedule 1, Good Laboratory Practice Regulations 1999 (SI 1999/3106 as amended by SI 2004/0994)).

Type of method:

ring method

Test material

Test material information

Constituent 1

Results and discussion

Surface tension

Surface tension:

73.9 mN/m

Temp.:

22 °C

Conc.:

1.01 g/L

Any other information on results incl. tables

Calibration factor ( Ф)

The readings, temperatures and the corresponding calibration factors for glass double-distilled water are shown in the following table:

 

Reading (mN/m)	Temperature (ºC)	Literature Value (mN/m)	Calibration Factor
73.0	22.0	72.41	0.992
73.0	22.0	72.41	0.992
73.0	22.0	72.41	0.992
73.0	22.0	72.41	0.992
73.0	22.0	72.41	0.992
73.0	22.0	72.41	0.992
Mean Calibration Factor = 0.992

Sample solution readings

The readings, times and temperatures for the sample solution are shown in the following table

 

Time (mins)	Reading (mN/m)	Temperature (ºC)
110	74.5	22.0
120	74.5	22.0
130	74.5	22.0
138	74.5	22.0
142	74.5	22.0

Mean reading                     :    74.5 mN/m
Surface tension                   =  reading x calibration factor
                                          =  74.5 x 0.992
                                          =  73.9 mN/m
Temperature                       :    22.0 ± 0.5ºC
pH of sample solution         :    5.1

Discussion

Substances showing a surface tension lower than 60 mN/m should be regarded as being surface-active.

Conclusion

The surface tension of a 1.01 g/l solution of test material has been determined to be 73.9 mN/m at 22.0 ± 0.5°C.  The test material is considered not to be a surface-active material.

Applicant's summary and conclusion

Conclusions:

The surface tension of a 1.01 g/l solution of test material has been determined to be 73.9 mN/m at 22.0 ± 0.5°C. The test material is considered not to be a surface-active material.

Executive summary:

The determination for substance NDS-Li in project number 1307 -0447 was carried out by using a White Electrical Institute interfacial tension balance and a procedure based on the ISO 304 ring method.  With the exception of the following deviation, the experimental procedure used complied with that specified in Method A5 of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC). The surface tension of a 1.01 g/l solution of test material has been determined to be 73.9 mN/m at 22.0 ± 0.5°C. The test material is considered not to be a surface-active material.