Registration Dossier

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 09 June 2017 to 25 July 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes
Type of method:
OECD harmonised ring method

Test material

Constituent 1
Chemical structure
Reference substance name:
Tributyl-2-thiourea
EC Number:
219-350-2
EC Name:
Tributyl-2-thiourea
Cas Number:
2422-88-0
Molecular formula:
C13H28N2S
IUPAC Name:
1,1,3-tributylthiourea
Test material form:
liquid
Details on test material:
- Name of test material (as cited in study report): Tri butyl thiourea
- Appearance: Clear pale to medium brown liquid
- Storage conditions: At room temperature

Results and discussion

Surface tension
Key result
Surface tension:
56.3 mN/m
Temp.:
20 °C
Remarks on result:
other: Conc.= 90% of test item saturation solubility

Any other information on results incl. tables

Table: Surface tension measurements

 

Measurement

Time passed after transfer test solution to test vessel
[minutes]

Surface tension (mN/m)

individual

mean (1)

mean (2)

1

15

58.1

56.7

56.3

2

16

56.8

 

 

3

17

56.6

 

 

4

18

56.6

 

 

5

20

56.5

 

 

6

21

56.8

 

 

(1) Mean calculated from measurements 2 to 6, after equilibrium was reached.

(2) Mean multiplied by the calibration factor and Harkins-Jordan corrected.

Applicant's summary and conclusion

Conclusions:
The surface tension of an aqueous substance solution at 90% of its saturation solubility was determined to be 56.3 mN/m (at 20°C).

Executive summary:

Using the OECD harmonized ring method in a GLP study according to EC A.5 and OECD 115, the surface tension of an aqueous substance solution at 90% of its saturation solubility was determined to be 56.3 mN/m (at 20°C). According to the EC A.5 guideline the substance is surface active.