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Physical & Chemical properties

Surface tension

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Administrative data

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

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
July 27, 1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to
Guideline:
other: ISO 304 – Surface Active Agents – Determination of surface tension by drawing up liquid films
Version / remarks:
December 15, 1985
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

Surface tensionopen allclose all
Key result
Surface tension:
60.5 mN/m
Temp.:
21 °C
Conc.:
90 other: % of saturation
Remarks on result:
other: 1st determination
Key result
Surface tension:
60.5 mN/m
Temp.:
20.9 °C
Conc.:
90 other: % saturation
Remarks on result:
other: 2nd determination

Any other information on results incl. tables

First determination

The temperature was 21.1°C at the beginning of the determination and 20.9°C at the end of the determination.The temperature during the determination did not vary by more than 0.5°C.

The time elapsed between the preparation of the solution and its transfer to the beaker is 1 minute and 24 seconds.

The following surface tension values were obtained:

Time (Min:Sec)

0:00

0:48

1:43

2:35

3:37

4:25

5:17

6:17

Surface Tension (mN/m)

 

61.7

61.3

61

61

60.7

60.6

60.7

Time (Min:Sec)

7:17

8:54

10:20

11:16

12:09

12:51

13:52

 

Surface Tension (mN/m)

60.8

60.7

60.6

60.5

60.5

60.5

60.5

 

 Surface Tension = f(t)

The five last values do not differ by more than 0.1mN/m from the mean, so they were used for the calculation of the mean.

By calculating the average of the five last values, the mean value obtained is 60.5mN/m.

 Second determination

The temperature was 20.9°C at the beginning of the determination and 20.8°C at the end of the determination. The temperature during the determination did not vary by more than 0.5°C.

The time elapsed between the preparation of the solution and its transfer to the beaker is 1 minute and 37 seconds.

The following surface tension values were obtained:

Time (Min:Sec)

0:00

1:04

1:59

3:42

3:41

4:40

Surface Tension (mN/m)

 

61.2

61.2

61.3

60.4

60.6

Time (Min:Sec)

5:26

6:11

7:05

9:14

12:07

 

Surface Tension (mN/m)

60.5

60.5

60.5

60.5

60.6

 

 Surface Tension = f(t)

The five last values do not differ by more than 0.1mN/m from the mean, so they were used for the calculation of the mean.

 

Applicant's summary and conclusion

Conclusions:
Results of duplicate determinations do not differ by more than 0.5 mN/m, so the mean value of 60.5 mN/m is retained for final result.
Executive summary:

A study was performed to determine the surface tension of the test item Tri-n-hexylamine. The method followed was designed to be compliant with the OECD Guideline for Testing of Chemicals No. 115, "Surface Tension of Aqueous Solutions" (1995). The procedure is considered to be compatible with the ISO 304 (1985) – Surface Active Agents – Determination of surface tension by drawing up liquid films and followed GLP.

In this method, the surface tension of the test item was determined at 20 +/-0,5°C using a Du Noüy ring.

The test item was used to prepare duplicate aqueous solutions that correspond to 90% of the saturated concentration obtained from 1 g/L loading rate. Their surface tension was then determined from five consecutive measurements with a deviation < 0.1 mN/m from the mean.

Determination 1 led to a value of 60.5 mN/m

Determination 2 led to a value of 60.5 mN/m

Results of duplicate determinations do not differ by more than 0.5 mN/m, so the mean value of 60.5 mN/m is retained for final result.