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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
17 Dec 2018 to 07 Mar 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
March 04, 2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
July 27, 1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Specific details on test material used for the study:
Appearance: Off-white powder
Purity/Composition: 98.8%
Test item storage: At room temperature
Key result
Surface tension:
66.8 mN/m
Temp.:
20 °C
Conc.:
90 other: test item saturation solubility

The results of the test on the determination of the surface tension of the test solution are given in Table 4.  The individual measurements were obtained with a coefficient of variation of < 0.2 mN/m.

Table 4       

Surface Tension of the Test Item

Measurement Time passed after measurement start [seconds] Surface tension (mN/m)
individual σ multiplied by Harkins-Jordan corrected value mean σ multiplied by Harkins-Jordan corrected value
1 40.26 66.81 66.80
2 66.95 66.8  
3 93.72 66.79  
4 120.29 66.79  
6 146.91 66.80  
Conclusions:
The OECD harmonized ring method was applied for the determination of the surface tension of 2-Benzoylbenzoic acid.

The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20°C was 66.80 mN/m. According to this, the test item is considered not to be surface active.
Executive summary:

In this guideline (OECD 115) study conducted with GLP certification, the test material (EC 201-612-2) was determined to have a surface tension of 66.80 mN/m @ 20 °C at 90% of the test item saturation solubility in water. The test item is considered not to be surface active.

Description of key information

Study conducted to recognised testing guidelines with GLP certification.

Key value for chemical safety assessment

Additional information

The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20°C was 66.80 mN/m.  According to this, the test item is considered not to be surface active.