Fatty acids, C16-18 and C18-unsatd., branched and linear, reaction products with diethanolamine

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental Starting Date: 06 November 2012 Experimental Completion Date: 08 November 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.
This deviation has been considered not to have affected the integrity of the study.

GLP compliance:

yes

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

Isostearamide DEA

IUPAC Name:

Isostearamide DEA

Details on test material:

Identification: Isostearamide DEA
Description: Amber colored liquid
Batch: OE11124 (6/202593/00)
Purity: 100%
Expiry / Retest Date: Not supplied
Storage Conditions: Room temperature in the dark

Results and discussion

Surface tension

Surface tension:

52.3 - 59.8 mN/m

Temp.:

20.4 °C

Remarks on result:

other: The surface tension of a 90 % saturated solution of duplicate 1.0 g/L preparations of test item in water has been determined to be in the range 52.3 to 59.8 mN/m at 20.4 ± 0.5 °C

Any other information on results incl. tables

Results

Calibration factor (Φ_b )

The readings, temperatures and the corresponding calibration factors for purified water are shown in the following tables:

 

Table 3.2 – Sample 1

 

Reading (mN/m)	Temperature (ºC)	Literature Value (mN/m)	Calibration Factor
72.5	20.4	72.66	1.002
72.5	20.4	72.66	1.002
73.0	20.4	72.66	0.995
72.5	20.2	72.69	1.003
72.5	20.4	72.66	1.002
72.5	20.4	72.66	1.002
72.5	20.4	72.66	1.002
73.0	20.4	72.66	0.995
72.5	20.4	72.66	1.002
Mean Calibration Factor = 1.001 (last six readings)

 

Table 3.3 – Sample 2

 

Reading (mN/m)	Temperature (ºC)	Literature Value (mN/m)	Calibration Factor
73.0	20.6	72.73	0.995
72.5	20.6	72.63	1.002
72.5	20.6	72.63	1.002
72.0	20.2	72.69	1.010
72.5	20.4	72.66	1.002
72.5	20.4	72.66	1.002
73.0	20.4	72.66	0.995
Mean Calibration Factor = 1.002 (last six readings)

 

 

Sample solution readings

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

 

Table 3.4 – Sample 1

 

Time (mins)	Reading (mN/m)	Temperature (ºC)
85	57.0	20.4
105	55.0	20.4
130	54.5	20.6
155	52.5	20.2
175	52.0	20.2
200	52.0	20.4
225	52.0	20.4
240	52.5	20.4
Mean sample reading = 52.2 mN/m (last five readings)

 

Table 3.5 – Sample 2

 

Time (mins)	Reading (mN/m)	Temperature (ºC)
95	59.0	20.6
120	59.5	20.6
140	60.0	20.6
165	59.5	20.4
190	60.0	20.6
210	60.0	20.4
Mean sample reading = 59.8 mN/m (last five readings)

 

Surface tension          =          reading x calibration factor
Sample 1                    =          52.3 mN/m
Sample 2                    =          59.9 mN/m
Temperature               :          20.4 ± 0.5 ºC
Solution pH                :          Sample 1 = 7.3
                                              Sample 2 = 7.9

 

Applicant's summary and conclusion

Conclusions:

The surface tension of a 90 % saturated solution of duplicate 1.0 g/L preparations of test item in water has been determined to be in the range 52.3 to 59.8 mN/m at 20.4 ± 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 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 a 90 % saturated solution of duplicate 1.0 g/L preparations of test item in water has been determined to be in the range 52.3 to 59.8 mN/m at 20.4 ± 0.5 °C. The test item is considered to be surface active.