Phosphorodithioic acid, mixed O,O-bis(2-ethylhexyl and iso-Bu and pentyl) esters, zinc salts

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Between 08 October 2012 and 03 December 2012.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

The surface tension result was not corrected using the Harkins-Jordan correction table

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

The surface tension result was not corrected using the Harkins-Jordan correction table

Principles of method if other than guideline:

The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy
(± 0.5 mN/m); this is as a result of the reduced ring dimensions.

GLP compliance:

yes

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

Phosphorodithioic acid, mixed O,O-bis(2-ethylhexyl and iso-Bu and pentyl) esters, zinc salts

EC Number:

273-527-9

EC Name:

Phosphorodithioic acid, mixed O,O-bis(2-ethylhexyl and iso-Bu and pentyl) esters, zinc salts

Cas Number:

68988-45-4

Molecular formula:

Not applicable

IUPAC Name:

Phosphorodithioic acid, mixed O,O-bis(2-ethylhexyl and iso-Bu and pentyl) esters, zinc salts

Details on test material:

Identification: A-197
Description: Pale brown liquid
Batch: B12-12212
Purity: 77 % in mineral oil
Expiry / Retest Date: 20 September 2013
Storage Conditions: Approximately 4 °C in the dark

Results and discussion

Surface tension

Surface tension:

54.4 mN/m

Temp.:

21.8 °C

Remarks on result:

other: The surface tension of duplicate 90% saturated solutions of test item in water has been determined to be 54.4 ± 0.5 mN/m at 21.8 ± 0.5 °C. The test item is considered to be surface-active.

Any other information on results incl. tables

Results

Calibration factor (Φ_b)

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

 

Table 3.7 – Sample 1

 

Reading (mN/m)	Temperature (ºC)	Literature Value (mN/m)	Calibration Factor
72.5	21.8	72.44	0.999
72.0	21.8	72.44	1.006
72.5	21.8	72.44	0.999
73.0	21.8	72.44	0.992
72.5	21.8	72.44	0.999
72.5	21.8	72.44	0.999
Mean Calibration Factor = 0.999

 

Table 3.8 – Sample 2

 

Reading (mN/m)	Temperature (ºC)	Literature Value (mN/m)	Calibration Factor
72.0	21.8	72.44	1.006
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
72.0	21.8	72.44	1.006
Mean Calibration Factor = 1.003

   

Sample solution readings

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

 

Table 3.9 – Sample 1

 

Time (mins)	Reading (mN/m)	Temperature (ºC)
209	54.5	21.8
218	54.0	21.8
230	54.5	21.8
242	54.0	21.8
255	54.5	21.8
Mean sample reading = 54.3

 

Table 3.10 – Sample 2

 

Time (mins)	Reading (mN/m)	Temperature (ºC)
283	54.5	21.8
293	54.5	21.8
304	54.0	21.8
316	54.5	21.8
329	54.0	21.8
Mean sample reading = 54.3

 

Surface tension          =                    reading x calibration factor
Sample 1                   =                    54.2 mN/m
Sample 2                   =                    54.5 mN/m
Mean                          :                     54.4 mN/m
Temperature               :                     21.8 ± 0.5 ºC
pH of sample solution:                      Sample 1 = 4.1
                                                        Sample 2 = 4.2

Applicant's summary and conclusion

Conclusions:

The surface tension of duplicate 90% saturated solutions of test item in water have been determined to be 54.4 ± 0.5 mN/m at 21.8 ± 0.5 °C. The test item is considered to be surface-active.

Executive summary:

The determination was carried out using a White Electrical Institute Co. Ltd. torsion balance for surface and interfacial tension measurements, using a procedure designed to be compatible with that specified in Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995.

  

Conclusion

The surface tension of duplicate 90% saturated solutions of test item in water has been determined to be 54.4 ± 0.5 mN/m at 21.8 ± 0.5 °C. The test item is considered to be surface-active.