Anthraquinone acid dye

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 December 2008 to 10 March 2009

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

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

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

see below

Principles of method if other than guideline:

Surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. This deviation has been considered not to have affected the integrity of the study.

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Test material

Test material information

Constituent 1

Details on test material:

- Name of test material (as cited in study report): INK BH11 M
- Substance type: dark red powder
- Lot/batch No.: MB-1A
- Storage condition of test material: room temperature in the dark

Results and discussion

Surface tension

Surface tension:

72.5 mN/m

Temp.:

21.8 °C

Conc.:

0.97 g/L

Any other information on results incl. tables

Calibration factor

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

Reading (mNlm)	Temperature (°C)	Literature Value (mNlm)	Calibration Factor
72.0	21.8	72.44	1.006
72.5	21.8	72.44	0.999
72.5	21.8	72.44	0.999
72.5	21.8	72.44	0.999
72.5	21.8	72.44	0.999
72.5	21.8	72.44	0.999
Mean Calibration Factor = 1.000

Sample solution readings

 

The readings, times and temperatures for the sample solution are shown in the followingtable:

Time (mins)	Reading (mNlm)	Temperature (°C)
80	72.5	21.8
97	72.5	21.8
110	72.5	21.8
125	72.5	21.8
139	72.5	21.8

Mean reading Surface tension

 

:72.5 mNlm

= reading x calibration factor

= 72.5 x 1.000 = 72.5 mN/m

Temperature                     : 21.8 ± 0.5°C

pH of sample solution : 4.4

The test material is considered not to be a surface-active material.

Applicant's summary and conclusion

Conclusions:

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

It is evident from the information obtained in a hydrolysis test performed on the substance and data relating to the pH of the test material in water that negligible hydrolysis of the sample solution occurred during the course of the surface tension test.

The surface tension of a 0.970 g/L solution of test material has been determined to be 72.5 mN/m at 21.8 1 0.5°C. The test material is considered not to be a surface-active material.

Executive summary:

In a determination of general physico chemical properties study (0959/0234) the surface tension of a 0.970 g/L solution of the substance has been determined in accordance with EU Method A5 to be 72.5 mN/m at 21.8 1 0.5°C. The test material is considered not to be a surface-active material.

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

 

It is evident from the information obtained in a hydrolysis test performed on the substance and data relating to the pH of the test material in water that negligible hydrolysis of the sample solution occurred during the course of the surface tension test.