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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:
from 31 JAN 2006 to 16 MAY 2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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
Key result
Surface tension:
73.1 mN/m
Temp.:
20.6 °C
Conc.:
1 g/L

Determination of Surface Tension for the test item solution

Time expired

(hours:min)

Temperature

(°C)

Surface tension

(mN/m)

measured

Mean value calculated from the bold values (s*)

Mean value corrected for calibration

(s1)

s1corrected for Harkins-Jordan

 

(s)

First sample

00:32

20.5

71.3

 

 

 

71.3

 

 

 

73.16

 

 

 

73.16

00:34

20.5

71.3

00:35

20.5

71.3

00:36

20.5

71.3

00:37

20.5

71.3

00:38

20.5

71.3

Second sample

00:35

20.6

71.3

 

 

 

71.28

 

 

 

73.14

 

 

 

73.14

00:37

20.6

71.3

00:39

20.6

71.3

00:40

20.6

71.3

00:41

20.6

71.3

00:42

20.6

71.2

 

 

Mean value from both samples:s= 73.1 mN/m

 

With

s* .fb=s1

     fb= calibration factor = 1.026

 

and

s1. Fc=s

Fc= factor for correction acc. to Harkins-Jordan

  = 1.000 for 73.16 mN/m and 73.14 mN/m

Conclusions:
The surface tension of cerium trinitrate in water was determined to be 73.1 mN/m at 20.6 °C. Therefore, the test item is considered not to be a surface active substance.
Executive summary:

To determine the surface tension of the test item using a ring tensiometer, an aqueous solution was prepared by weighing 214.14 mg of test item in a 200 mL flask and filled up to the mark with double distilled water. After sonification for 4 minutes, the test item was completely dissolved. Thus, no further treatment was necessary. Recordings of surface tension were done on two samples of the test item solution, with six measurements per sample.

 

The surface tension of cerium trinitrate in water was determined to be 73.1 mN/m at 20.6 °C. Based on this result, the test item is not a surface active substance.

Description of key information

The surface tension of cerium trinitrate in water was determined in a GLP study to be 73.1 mN/m at 20.6 °C using the ring method in accordance with EC test method A.5 (Weissenfeld, 2006).

Key value for chemical safety assessment

Surface tension:
73.1
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The test item is not a surface active substance.