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Diss Factsheets

Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experimental Starting Date: 11 October 2012. Experimental Completion Date: 25 January 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method

Test material

Constituent 1
Chemical structure
Reference substance name:
N4-Benzoylcytosine
EC Number:
628-907-2
Cas Number:
26661-13-2
Molecular formula:
C11H9N3O2
IUPAC Name:
N4-Benzoylcytosine
Specific details on test material used for the study:
Identification: N-Benzoyl Cytosine
Description: Off white powder
Batch: NBC-5-11001
Purity: ≥ 95.0%
Expiry / Retest Date: Not supplied
Storage Conditions: Room temperature in the dark over silica gel

Results and discussion

Surface tension
Key result
Surface tension:
72.2 mN/m
Temp.:
21.2 °C
Conc.:
1 g/L

Any other information on results incl. tables

Calibration factor (Φb)

The readings, temperatures and the corresponding calibration factors for purified water are shown in the following tables:

Sample 1

Reading (mN/m) Temperature (ºC) Literature Value (mN/m) Calibration Factor
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72 21.2 72.53 1.007
72.5 21.2 72.53 1
72 21.2 72.53 1

Sample 2

Reading (mN/m) Temperature (ºC) Literature Value (mN/m) Calibration Factor
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72.5 21.2 72.53 1
72.5 21.2 72.53 1
Mean Calibration Factor = 1.000 (all six readings)

Sample solution readings

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

Sample 1

Time (mins) Reading (mN/m) Temperature (ºC)
82 72 21.2
92 72 21.2
102 72 21.2
11 72 21.2
121 72.5 21.2
Mean sample reading = 72.1 (all five readings)

Sample 2

Time (mins) Reading (mN/m) Temperature (ºC)
88 72 21.2
97 72 21.2
107 72 21.2
116 72.5 21.2
130 72.5 21.2
Mean sample reading = 72.2 (all five readings)

Surface tension = reading x calibration factor

Sample 1 = 72.1 mN/m x 1.001 = 72.2 mN/m

Sample 2 = 72.2 mN/m x 1.000 = 72.2 mN/m

Mean : 72.2 mN/m

Temperature : 21.2 ± 0.5 ºC

pH of sample solution : Sample 1 = 4.7   Sample 2 = 5.5

Applicant's summary and conclusion

Conclusions:
The surface tension of a 90 % saturated solution of test item in water has been determined to be 72.2 ± 0.5 mN/m at 21.2 ± 0.5 °C. The test item is considered to be not surface-active.
Executive summary:

The surface tension of a 90 % saturated solution of test item in water has been determined to be 72.2 ± 0.5 mN/m at 21.2 ± 0.5 °C, using a ring method, designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item is considered to be not surface-active.