Decanal

Surface tension

Link to relevant study record(s)

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