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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 26 SEP 2007 to 6 DEC 2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
64 mN/m
Temp.:
20.7 °C
Conc.:
90 other: %

The calibration factor Φb was determined to be 1.0305 for double distilled water (Table 1).

Table 2 shows the individual measurements for the surface tension of the aqueous test item solution. From these, the mean and the corrected value for the given solution were calculated and also shown in Table 2. The tabulated values represent rounded results obtained from calculation using the exact raw data.

Table 1: Determination of the Calibration Factor Using Water 

Time expired

Temperature

Surface tension

[mN/m]

Calibration factor

measured

mean value

calculated from the bold values

[hours:min]

[°C]

 

σg

Φb

00:32

20.2

71.0

70.57

1.0305

00:33

20.2

70.7

00:34

20.2

70.6

00:35

20.2

70.4

00:36

20.2

70.4

00:37

20.2

70.3

 

 

with

σo = 72.72 mN/m at20.2 °C

Φb =σo /σg

Φb = 72.72 / 70.57 = 1.0305

where

Φb = calibration factor

σo = the surface tension of water at the test temperature

σg = measured value of the surface tension of water at the test temperature

Table 2: Determination of Surface Tension for the Test Item

Time expired

Temperature

Surface tension

[mN/m]

 

 

measured

mean value calculated from the bold values

mean value corrected for calibration

 

σ1corrected for  Harkins-Jordan

[hours:min]

[°C]

 

(σ*)

1)

(σ)

First sample

 

 

 

 

0:31

20.6

63.5

62.90

64.82

64.26

0:32

20.6

63.1

0:33

20.6

62.9

0:34

20.6

62.8

0:35

20.6

62.6

0:36

20.6

62.5

Second sample

 

 

 

 

0:33

20.8

62.7

62.43

64.34

63.77

0:34

20.8

62.6

0:35

20.8

62.4

0:36

20.8

62.4

0:37

20.8

62.3

0:38

20.8

62.2

 

Mean value from both samples: σ= 64.0 mN/m

with

σ* ·Φb =σ1

Φb = calibration factor = 1.0305

and

σ1 · Fc =σ

Fc = factor for correction acc. to Harkins-Jordan

= 0.991 for 64.82 mN/m and 64.34 mN/m

 

Conclusions:
The surface tension of DIMETHYL 2-METHYL GLUTARATE in water (90% of saturation concentration) was determined to be 64.0 mN/m at 20.7 °C. Therefore DIMETHYL 2-METHYL GLUTARATE is a not surface active substance.
Executive summary:

The surface tension of an aqueous solution of DIMETHYL 2-METHYL GLUTARATE was evaluated based on the ring method according to the method of the EEC Directive 92/69, part A.5, to the OECD Guideline No. 115 and to the GLP.

The measurements were performed in duplicate, using a ring tensiometter, on an aqueous solution of DIMETHYL 2-METHYL GLUTARATE (90% of saturation concentration).

The surface tension of DIMETHYL 2-METHYL GLUTARATE in water (90% of saturation concentration) was determined to be 64.0 mN/m at 20.7 °C. Therefore DIMETHYL 2-METHYL GLUTARATE is a not surface active substance.

Description of key information

The surface tension of DIMETHYL 2-METHYL GLUTARATE in water (90% of saturation concentration) was determined to be 64.0 mN/m at 20.7 °C. Therefore DIMETHYL 2-METHYL GLUTARATE is a not surface active substance.

Key value for chemical safety assessment

Surface tension:
64

Additional information

One experimental study, scored as Klimisch 1, is available (Weissenfeld M., 2007) and selected as a key study.