LUMIPOD

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes (incl. QA statement)

Surface tension:

47.3 mN/m

Temp.:

20 °C

Conc.:

6.1 mg/L

Surface tension:

37.3 mN/m

Temp.:

20.1 °C

Conc.:

1 g/L

4. Results

4.1. Solution at 6.1 mg/L

4.1.1. Verification with distilled water

Temperature (°C)	20.2
Time	Surface tension (mN/m)
After 24 s	71.51
After 85 s	71.46
After 147 s	71.36
Mean result	71.4

The mean surface tension of distilled water was 71.4 mN/m at 20.2 °C, measurement vessel was considered to be clean (see §3.3.3.) and ready for use.

 

4.1.2. Measurements on the test item diluted at 6.1 mg/L in distilled water

Assay No.	2		Assay No.	3		Assay No.	4
Temperature (°C)	20.0		Temperature (°C)	19.9		Temperature (°C)	19.7
Time	Surface tension (mN/m)		Time	Surface tension (mN/m)		Time	Surface tension (mN/m)
After 23 s	48.19		After 23 s	47.48		After 23 s	46.54
After 84 s	48.10		After 84 s	47.22		After 84 s	46.49
After 145 s	48.05		After 145 s	47.19		After 145 s	46.53
			After 207 s	47.19
Mean result	48.1		Mean result	47.2		Mean result	46.5

Remark: The first assay was not taken into account; the value did not stabilise. 

 

4.2. Solution at 1 g/L

4.2.1. Verification with distilled water

Temperature (°C)	19.9
Time	Surface tension (mN/m)
After 23 s	72.47
After 84 s	72.47
After 146 s	72.47
Mean result	72.5

The mean surface tension of distilled water was 72.5 mN/m at 19.9 °C, measurement vessel was considered to be clean (see §3.3.3.) and ready for use.

 

4.2.2. Measurements on the test item diluted at 1 g/L in distilled water

Assay No.	1		Assay No.	2		Assay No.	3
Temperature (°C)	20.3		Temperature (°C)	20.0		Temperature (°C)	20.0
Time	Surface tension (mN/m)		Time	Surface tension (mN/m)		Time	Surface tension (mN/m)
After 20 s	37.40		After 21 s	36.89		After 32 s	37.50
After 80 s	37.40		After 83 s	36.91		After 92 s	37.46
After 141 s	37.42		After 143 s	36.97		After 153 s	37.45
Mean result	37.4		Mean result	36.9		Mean result	37.5

 

Conclusions:

The mean surface tension of the test item at 6.1 mg/L in distilled water at a temperature of 20.0 °C was 47.3 mN/m ± 0.7 mN/m.

The mean surface tension of the test item at 1 g/L in distilled water at a temperature of 20.1 °C was 37.3 mN/m ± 0.3 mN/m.

The test item was considered as surface-active under the experimental conditions used.

Executive summary:

In compliance with 

Regulation (EC) No. 1907/2006, Council Regulation (EC) No. 440/2008
EC A.5. method (2008) and OECD Guideline No. 115 (1995)

 

The mean surface tension of the test item at 6.1 mg/L in distilled water at a temperature of 20.0 °C was 47.3 mN/m ± 0.7 mN/m.

 

The mean surface tension of the test item at 1 g/L in distilled water at a temperature of 20.1 °C was 37.3 mN/m ± 0.3 mN/m.

 

The test item was considered as surface-active under the experimental conditions used.

Description of key information

In compliance with 

Regulation (EC) No. 1907/2006, Council Regulation (EC) No. 440/2008
EC A.5. method (2008) and OECD Guideline No. 115 (1995)

 

The mean surface tension of the test item at 6.1 mg/L in distilled water at a temperature of 20.0 °C was 47.3 mN/m ± 0.7 mN/m.

 

The mean surface tension of the test item at 1 g/L in distilled water at a temperature of 20.1 °C was 37.3 mN/m ± 0.3 mN/m.

 

The test item was considered as surface-active under the experimental conditions used.

Key value for chemical safety assessment

Surface tension:

47.3

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

6.1