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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Testing was conducted between 14 December 2011 and 24 January 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study.
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.
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 (incl. QA statement)
Type of method:
ring method
Specific details on test material used for the study:
Sponsor's identification: Aldehyde C10 Decylic
Description : Clear colourless liquid
Chemical name: Decanal
CAS Number : 112-31-2
Batch number: AS00074772
Label : ALDEHYDE C10 DECYLIC Batch: AS00074772 Expiry date: 26.07.2012 Net weight 0.008KG
Date received: 03 October 2011
Expiry date : 26 July 2012
Storage conditions: Room temperature in the dark

The integrity of supplied data relating to the identity, purity and stability of the test item is the responsibility of the Sponsor. A Certificate of Analysis, provided by the Sponsor, is presented in the attachment "cofa".
Surface tension:
>= 59.9 - <= 60.1 mN/m
Temp.:
18.2 °C
Conc.:
0.003 g/L
Remarks on result:
other: 2.80 x 10-3 to 3.02 x 10-3 g/L

Results

Sample solution concentrations

The mean peak areas relating to the standard and sample solutions are shown in the following table:

Table 4.3

Solution

Mean Peak Area

Standard 51.9 mg/l

1.5657

Standard 51.1 mg/l

1.5351

Sample A1

9.0031 x 10-2

Sample A2

9.1716 x 10-2

Sample B1

8.4720 x 10-2

Sample B2

8.4091 x 10-2

Mean sample solution concentrations:

3.02 x 10-3g/l (Sample A) and 2.80 x 10-3g/l (Sample B).

Calibration factor (f)

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

Table 4.4 – Sample A

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

73.0

18.0

73.03

1.000

73.0

18.2

73.00

1.000

72.5

18.2

73.00

1.007

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

Mean Calibration Factor = 1.001


Table 4.5 – Sample B

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

73.0

18.2

73.00

1.000

72.5

18.2

73.00

1.007

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

73.0

18.2

73.00

1.000

Mean Calibration Factor = 1.001

Sample solution readings

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

Table 4.6 – Sample A

Time (mins)

Reading (mN/m)

Temperature (ºC)

273

59.5

18.0

278

60.0

18.2

282

60.5

18.2

287

60.0

18.2

293

60.0

18.2

299

60.5

18.2

Mean reading                :   60.1 mN/m
Surface tension            = reading x calibration factor
                                         = 60.1 x 1.001
                                         = 60.1 mN/m
Temperature                  :   18.2 ± 0.5 ºC
pH of sample solution  :   4.4


Table 4.7 – Sample B

Time (mins)

Reading (mN/m)

Temperature (ºC)

308

59.5

18.2

313

60.0

18.2

318

60.0

18.2

323

60.0

18.2

328

59.5

18.2

Mean reading                :   59.8 mN/m
Surface tension            = reading x calibration factor
                                         = 59.8 x 1.001
                                         = 59.9 mN/m
Temperature                  :   18.2 ± 0.5 ºC
pH of sample solution  :   4.5

Conclusions:
The surface tension of duplicate 90 % saturated solutions of test item in water was determined to be in the range 59.9 to 60.1 mN/m at 18.2 ± 0.5°C. The 90 % saturated solutions were determined to contain 2.80 x 10-3 to 3.02 x 10-3 g/l of test item (GC method), but may also have contained an unknown amount of test item degradant. The test item and/or degradant was considered to be borderline surface-active.

Description of key information

Surface tension: 59.9 to 60.1 mN/m at 18.2 ± 0.5°C. The 90 % saturated solutions were determined to contain 2.80 to 3.02 mg/L of test item (EU method A.5), but may also have contained an unknown amount of test item degradant.  The test item and/or degradant was considered to be borderline surface-active.

Key value for chemical safety assessment

Surface tension:
59.9
in mN/m at 20°C and concentration in mg/L:
2.8

Additional information