Triethyl phosphonoacetate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 16 December 2011 to 3 September 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted in compliance with international and OECD standard guidelines under GLP conditions. The study report was well documented with all mandatory information included.

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.This deviations has been considered not to have affected the integrity of the 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.This deviations has been considered not to have affected the integrity of the study.

GLP compliance:

yes (incl. QA statement)

Remarks:

2011-08-31

Type of method:

ring method

Surface tension:

> 55.1 - < 55.2 mN/m

Temp.:

22.8 °C

Conc.:

1.03 g/L

Calibration factor ( Φb)

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

Results for sample 1

Reading (mN/m)	Temperature (°C)	Literature value (mN/m)	Calibration factor
72.5	22.8	72.3	0.997
72.5			0.997
72.0			1.004
72.5			0.997
72.0			1.004
72.5			0.997
72.5			0.997
72.5			0.997
72.0			1.004
Mean calibration factor = 0.999

Results for sample 2

Reading (mN/m)	Temperature (°C)	Literature value (mN/m)	Calibration factor
72.5	22.8	72.3	0.997
72.5			0.997
72.5			0.997
72.0			1.004
72.5			0.997
72.5			0.997
Mean calibration factor = 0.998

Sample solutions readings:

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

Results for sample 1

Time (min)	Reading (mN/m)	Temperature (°C)
116	56.0	22.8
125	54.5
134	54.0
143	55.0
151	55.5
159	55.5
168	55.0
177	55.5
Mean sample reading = 55.3 (last five readings used)

Results for sample 2

Time (min)	Reading (mN/m)	Temperature (°C)
163	55.0	22.8
172	55.0
179	55.5
189	55.0
198	55.5
Mean sample reading = 55.2

Surface tension = reading * calibration factor

Sample 1 = 55.2mN/m

Sample 2 = 55.1 mN/M

Temperature = 22.8 ± 0.5°C

Sample 1 pH = 4.8

Sample 2 pH = 4.7

Substances showing a surface tension lower than 60 mN/m are regarded as being surface active. So the test item has to be considered as surface active.

Conclusions:

The surface tension of duplicate 1.03 g/l solutions of test item in water has been determined to be in the range to 55.1 to 55.2 mN/m at 22.8 ± 0.5°C.
The test item is considered to be surface active.

Executive summary:

The determination was carried out using a White electrical institue Co.Ltd. torsion balance for surface and interfacial tension measurements and a procedure according to Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP. The surface tension result was not corrected using the Harkins-Jordan correction table. This deviation has been considered not to have affected the integrity of the study.

The determination of surface tension is accomplished by means of a tensiometer, using the ring method. The force which is required to withdraw a horizontally suspended ring from the surface of solution is measured.

The surface tension of duplicate 1.03 g/l solutions of test item in water has been determined to be in the range to 55.1 to 55.2 mN/m at 22.8 ± 0.5°C. All measured values lay below the threshold for surface tension which is stated in the guidelines (60mN/m).

The test item is considered to be surface active.

Description of key information

Experimental value for test item surface tension: 55.1 to 55.2 mN/m at 22.8 ± 0.5°C (solution of test item at 1.03g/l).
The test item is a surface active according to the guidelines.

Key value for chemical safety assessment

Surface tension:

55.1

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

1 030

Additional information

The determination was carried out using a White electrical institute Co.Ltd. torsion balance for surface and interfacial tension measurements and a procedure designed according to Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008, Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995 and according to GLP. The surface tension result was not corrected using the Harkins-Jordan correction table. This deviation has been considered not to have affected the integrity of the study.

All measured values lay below the threshold for surface tension which is stated in the guidelines (60mN/m).

The test item is considered to be surface active.