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Surface tension

Link to relevant study record(s)

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

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:

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*)	(σ1)	(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.