Iodonium, bis[4-(1,1-dimethylethyl)phenyl]-, hexafluorophosphate(1-) (1:1)

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 Nov 2011 – 13 Jan 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP study according to ISO standard, almost equivalent to EU and OECD methods (because Harkins-Jordan correction was not applied)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: ISO 304

Deviations:

no

Test guideline 2

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

No Harkins-Jordan correction applied in view of the apparatus used. Once calibrated, the balance and ring assembly give a direct reading for surface tension (within the required accuracy (± 0.5 mN/m)); this is as a result of the reduced ring dimensions.

Test guideline 3

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

see OECD 115

GLP compliance:

yes (incl. QA statement)

Remarks:

Department of Health, UK GLP Monitoring Authority (2011)

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

bis(4-tert-butylphenyl)iodanium; hexafluoro-λ⁵-phosphanuide

EC Number:

620-341-4

Cas Number:

61358-25-6

Molecular formula:

C20H26F6IP

IUPAC Name:

bis(4-tert-butylphenyl)iodanium; hexafluoro-λ⁵-phosphanuide

Details on test material:

- Name of test material (as cited in study report): PF-6
- Physical state: white powder
- Analytical purity: 99.2 %
- Batch No.: 20101020
- Expiration date of the batch: 12 April 2012
- Storage condition of test material: In the dark, at room temperature

Results and discussion

Surface tension

Surface tension:

53.9 mN/m

Temp.:

22 °C

Remarks on result:

other: surface-active substance

Any other information on results incl. tables

Calibration factor:

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

Reading (mN/m)	Temperature (°C)	Literature Value (mN/m)	Calibration Factor
72.50	22.2	72.38	0.998
72.50	21.8	72.44	0.999
72.50	21.8	72.44	0.999
72.50	21.8	72.44	0.999
72.50	21.8	72.44	0.999
72.50	21.8	72.44	0.999
Mean Calibration Factor = 0.999 (n=6)

 

Sample solution readings:
Several sample readings were taken that during the course of the test were considered to have been incorrectly recorded and have not been reported. Hence, further readings were concurrently performed for confirmation and these are the readings that are reported and used in the determination of the surface tension.

 

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

Time (mins)	Reading (mN/m)	Temperature (°C)
295	54.0	21.8
314	54.0	21.8
330	54.0	21.8
343	54.0	21.8
354	54.0	21.8

 

Mean reading: 54.0 mN/m
Surface tension = reading x calibration factor
= 54.0 x 0.999
= 53.9 mN/m

Temperature: 22.0 ± 0.5 °C
pH of sample solution: 4.0

 

Determination of sample concentration: Mean sample solution concentration = 0.259 g/L (based on analysis of cationic part)

 

The hexafluorophosphate counter ion was not individually monitored for.

Applicant's summary and conclusion

Conclusions:

The surface tension of a 0.259 g/L solution of PF-6 has been determined to be 53.9 mN/m at 22.0 ± 0.5 °C using the ring method. Based on this result is PF-6 considered to be a surface-active substance.