Reaction mass of lauric acid, compound with morpholine (1:1) and 2-ethylhexyl dihydrogen phosphate, compound with morpholine (1:2) and bis(2-ethylhexyl) hydrogen phosphate, compound with morpholine (1:1)

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 2017-01-30 to 2017-02-08

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:

27.6 mN/m

Temp.:

20 °C

Conc.:

1 g/L

The test item solution was held at constant temperature (20.0 ± 0.5 °C) in a temperature controlled room. The following values of the test items aqueous solution (ca. 100 mg / 100 mL) were recorded.

Measurement	Time expired (sec)*	Surface tension (mN/m)		Temperature (°C)
				before measurements	after measurements
1/1	55	27.8	27.8	20.1	20.0
	88	27.8
	122	27.8
	155	27.7
	189	27.6
1/2	57	27.8	27.7	19.9	19.9
	89	27.7
	121	27.7
	154	27.7
	186	27.7
2/1	62	27.3	27.2	19.9	19.9
	95	27.2
	127	27.2
	160	27.2
	193	27.2
2/2	59	27.6	27.5	20.0	20.0
	93	27.5
	123	27.6
	158	27.4
	190	27.5
3/1	55	27.7	27.7	20.1	20.1
	88	27.7
	120	27.7
	153	27.7
	186	27.7
3/2	56	27.7	27.7	20.0	20.1
	89	27.7
	121	27.8
	155	27.7
	189	27.7
		Mean:	27.6
		RSD %:	0.79

* Time expired since the test item solution was transferred into the test vessel

The surface tension of the test items aqueous solution (ca. 100 mg / 100 mL) was found to be 27.6 mN/m. The density of the test solution was determined to be 1.000 g/mL. As this value is lower than 60 mN/m, the test item is classified as surface active.

Conclusions:

The surface tension of the test item was determined to be 27.6 mN/m at 20 °C. As this value is lower than 60 mN/m, the test item is classified as surface active.

Executive summary:

A study was conducted according to OECD TG 115 and Regulation (EC) No 440/2005 Method A.5 to determine the surface tension of an aqueous solution of the test item using the ring method. Therefore, a saturated solution of the test substance in ultrapure water was prepared in by adding ca. 100 mg of the test substance to 100 mL of ultrapure water and thoroughly mixed at a constant temperature (20 °C). Surface tension was determined at 20.0 ± 0.5 °C. The surface tension of the test items aqueous solution (ca. 100 mg / 100 mL) was found to be 27.6 mN/m. The density of the test solution was determined to be 1.000 g/mL. As this value is lower than 60 mN/m, the test item is classified as surface active.

Description of key information

The surface tension of the test item was determined to be 27.6 mN/m at 20 °C. As this value is lower than 60 mN/m, the test item is classified as surface active.

Key value for chemical safety assessment

Surface tension:

27.6

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

1 000

Additional information

A study was conducted according to OECD TG 115 and Regulation (EC) No 440/2005 Method A.5 to determine the surface tension of an aqueous solution of the test item using the ring method. Therefore, a saturated solution of the test substance in ultrapure water was prepared in by adding ca. 100 mg of the test substance to 100 mL of ultrapure water and thoroughly mixed at a constant temperature (20 °C). Surface tension was determined at 20.0 ± 0.5 °C. The surface tension of the test items aqueous solution (ca. 100 mg / 100 mL) was found to be 27.6 mN/m. The density of the test solution was determined to be 1.000 g/mL. As this value is lower than 60 mN/m, the test item is classified as surface active.