Glycerides, tall-oil mono-

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03. Aug. 2018 to 06. Aug. 2018

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)

Version / remarks:

OECD Guideline 115 dated 27. July 1995 “Surface tension of aqueous solutions“

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

Commission Regulation (EC) No. 440/2008, from 30. May 2008, published on 31 May 2008, EU-Method A.5 “Surface Tension“

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

plate method

Specific details on test material used for the study:

No further details specified in the study report.

Key result

Surface tension:

63.8 mN/m

Temp.:

19.8 °C

Conc.:

90 vol%

Finding Reference Test

Water, HPLC grade was measured.

 

Measured Values Negative Control

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	4.2	0.2978	72.65	21.5
2	5.2	0.2972	72.50	21.5
3	6.2	0.2970	72.45	21.5
4	7.1	0.2971	72.48	21.5
5	8.2	0.2969	72.43	21.5
6	9.1	0.2973	72.53	21.5
7	10.2	0.2975	72.57	21.5
8	11.1	0.2973	72.53	21.5
9	12.2	0.2973	72.53	21.5
10	13.1	0.2971	72.48	21.5
Mean			72.51
Standard Deviation			0.06

 

Findings Main Test

The test item solution was held at constant temperature (20.0 ± 0.4 °C). 61 minutes after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

 

Measured Values Test Item First Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	4.2	0.2629	64.13	19.8
2	5.2	0.2617	63.84	19.8
3	6.2	0.2615	63.79	19.8
4	7.2	0.2615	63.79	19.8
5	8.2	0.2614	63.77	19.8
6	9.2	0.2614	63.77	19.8
7	10.2	0.2613	63.74	19.8
8	11.2	0.2612	63.72	19.8
9	12.2	0.2612	63.72	19.8
10	13.2	0.2612	63.72	19.8
Mean			63.80
Standard Deviation			0.12

 

Measured Values Test Item Second Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	4.1	0.2713	66.18	20.4
2	5.1	0.2705	65.99	20.4
3	6.1	0.2702	65.91	20.4
4	7.1	0.2702	65.91	20.4
5	8.1	0.2702	65.91	20.4
6	9.1	0.2699	65.84	20.4
7	10.1	0.2699	65.84	20.4
8	11.1	0.2697	65.79	20.4
9	12.1	0.2700	65.87	20.4
10	13.1	0.2697	65.79	20.4
Mean			65.90
Standard Deviation			0.12

 

After the first and second measurement series, the difference between the mean values was less than 5% (3.29%). Therefore no additional measurement series was required.

Conclusions:

During the specified period of time, no significant changes in the surface tension were detected.
Values ranging from 63.72 mN/m to 66.18 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference (less than 5 % (3.29%)) between mean values of the two measurement series).
As the determined surface tension of LUMULSE GMT-K was higher than 60 mN/m, the test item can be classified as not surface active.

Executive summary:

Determination of the surface tension of an aqueous solution of LUMULSE GMT-K according to OECD 115 resp. EU A.5

 

Findings and Results:

The surface tension of an aqueous solution of LUMULSE GMT-K was determined as 63.80 ± 0.12 mN/m at 19.8 °C. One measurement was performed for verification (after 61 minutes). No significant changes and thus no significant dependence on time was observed.

 

As these values were higher than 60 mN/m, LUMULSE GMT-K was classified as not surface active.

 

The surface tension of the negative control lay within the accepted range.

 

The concentration of the test item in the 90% saturated test solution was determined as 14.03 mg test item/L (based on analysis of dissolved organic carbon in the test solution).

The saturated solution was obtained from an aqueous solution prepared with 1.00 g/L of test item slow shaken at 100 rpm for 72 h at 20.2 – 22.1 °C in standing position.

Description of key information

The surface tension of an aqueous solution of LUMULSE GMT-K was determined as 63.80 ± 0.12 mN/m at 19.8 °C.

As the value was higher than 60 mN/m, LUMULSE GMT-K was classified as not surface active.

Key value for chemical safety assessment

Surface tension:

63.8

in mN/m at 20°C and concentration in mg/L:

14.03

Additional information

The surface tension of an aqueous solution of LUMULSE GMT-K was determined as 63.80 ± 0.12 mN/m at 19.8 °C. One measurement was performed for verification (after 61 minutes). No significant changes and thus no significant dependence on time was observed.

As these values were higher than 60 mN/m, LUMULSE GMT-K was classified as not surface active.

 

The concentration of the test item in the 90% saturated test solution was determined as 14.03 mg test item/L (based on analysis of dissolved organic carbon in the test solution).

The saturated solution was obtained from an aqueous solution prepared with 1.00 g/L of test item slow shaken at 100 rpm for 72 h at 20.2 – 22.1 °C in standing position.