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Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experiment start date - 17 March 2010; Experiment completion date - 18 March 2010; Study completion date - 19 April 2010.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Specific details on test material used for the study:

Identification: FAT 40851/A TE
Batch Number: TZ 5891 / BOP 02-09
Purity: 69.9 % all coloured components
Appearance: Orange powder
Expiry Date: July 31, 2014
Storage Conditions: At room temperature at about 20 °C

Surface tension:

66.7 mN/m

Temp.:

19.8 °C

Conc.:

1 vol%

Remarks on result:

other: Not surface active according to the guideline criteria

Determination of the Calibration Factor Using Water

Time expired [hours:min]	Temperature [°C]	Surface tension [mN/m]		Calibration factor
		Measured	Mean value calculated from the bold values σg	Φb
00:31	19.5	70.4	70.22	1.0371
00:32	19.5	70.3
00:34	19.5	70.2
00:35	19.5	70.2
00:36	19.5	70.1
00:37	19.5	70.1

with

σo = 72.825 mN/m at 19.5 °C

Φb = σo/ σg = 72.825 / 70.22 = 1.0371

where

Φb = calibration factor

σo = the surface tension of water at the test temperature

σg = measured value of the surface tension of water

at the test temperature

Table 2: Determination of Surface Tension for the Test Item Solution

Time expired	Temperature	Surface tension measured	[mN/m]
			mean value calculated from the bold values	mean value corrected for calibration	σ1 -corrected for Harkins-Jordan
[hours:min]	[°C]	[mN/m]	(σ*)	(σ1)	(σ)
First Sample
0:33	19.8	64.7	64.70	67.10	66.71
0:34	19.8	64.7
0:35	19.8	64.7
0:36	19.8	64.7
0:37	19.8	64.7
0:38	19.8	64.7
Second sample
0:34	19.8	64.6	64.60	67.00	66.60
0:35	19.8	64.6
0:36	19.8	64.6
0:37	19.8	64.6
0:38	19.8	64.6
0:39	19.8	64.6

Mean value from both samples: σ = 66.7 mN/m

With

σ* ∙Φb=σ1, Φb = 1.0371,

Φb: calibration factor

and

σ1 ∙ Fc = σ

                          Fc= 0.991 mN/m for σ1= 67.10 mN/m and

                          Fc= 0.990 mN/m for σ1= 67.00 mN/m

Fc: factor for correction acc. to Harkins-Jordan

Conclusions:

The surface tension of test substance in water (at a concentration of about 0.1 %) was determined to be 66.7 mN/m at 19.8 °C.

Executive summary:

The determination of the surface tension of an aqueous solution of test substance was based on the OECD Guideline No. 115: “Surface Tension of Aqueous Solutions” (1995) and on the EEC Directive 92/69, EEC Publication No. L383, December 1992 and the Council Regulation (EC) No. 440/2008, 30 May 2008, Part A, Methods for the determination of physico-chemical properties, A.5 “Surface tension”. The determination of the surface tension was accomplished by means of a tensiometer, using the ring method under GLP. The force which was required to withdraw a horizontally suspended ring from the surface of the solution is measured. The calibration factor Φb was determined to be 1.0371 for double distilled water. The mean and the corrected value for the given solution were calculated. The surface tension of test substance in water (at a concentration of 0.1%) was determined to be 66.7 mN/m at 19.8 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, test substance has to be considered as a not surface active substance.

Description of key information

The surface tension of test substance in water (at a concentration of 0.1 %) was determined to be 66.7 mN/m at 19.8 °C.

Key value for chemical safety assessment

Surface tension:

66.7

in mN/m at 20°C and concentration in mg/L:

1 000

Additional information

The determination of the surface tension of an aqueous solution of test substance was based on the OECD Guideline No. 115: “Surface Tension of Aqueous Solutions” (1995) and on the EEC Directive 92/69, EEC Publication No. L383, December 1992 and the Council Regulation (EC) No. 440/2008, 30 May 2008, Part A, Methods for the determination of physico-chemical properties, A.5 “Surface tension”. The determination of the surface tension was accomplished by means of a tensiometer, using the ring method under GLP. The force which was required to withdraw a horizontally suspended ring from the surface of the solution is measured. The calibration factor Φb was determined to be 1.0371 for double distilled water. The mean and the corrected value for the given solution were calculated. The surface tension of test substance in water (at a concentration of 0.1 %) was determined to be 66.7 mN/m at 19.8 °C. Based on the criteria as outlined in the EEC Guideline and the results of this study, test substance has to be considered as a not surface active substance.