2-methoxy-4-propylphenol

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

23 January - 20 October, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. Test substance is adequately specified with purity. Therefore full validation applies.

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

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Remarks:

UK GLP compliance programme (inspected on 05 February 2014 / signed on 07 October 2015)

Type of method:

OECD harmonised ring method

Key result

Surface tension:

37.5 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Test temperature: 20 °C

Solution concentration: 1 g/L

Solution age: Samples were mixed for 24 hours and then tested immediately.

Initial values for the surface tension were obtained as soon as possible after transfer of the aqueous solution to the measurement vessel.

 

Time (minutes)	Surface tension (mN/m)
	Measured		Calibration corrected
	A	B	A	B
0	40.5	40.0	40.8	40.3
5	40.5	40.5	40.8	40.8
10	40.5	40.5	40.8	40.8
15	40.5	40.0	40.8	40.3
20	40.5	40.0	40.8	40.3
25	40.5	40.0	40.8	40.3
30	40.5	40.0	40.8	40.3

 

Overall mean calibration corrected surface tension = 40.5 mN/m (to the nearest ± 0.5 mN/m)

Harkins-Jordan* corrected value = 37.5 mN/m

For the ring used, which has a radius of 6.37 mm and a wire radius of 0.150 mm, the following relationship between the mean calibration corrected equilibrium value (x) and the Harkins-Jordan corrected value (y) has been derived: y = -0.285 + 0.862x + 0.00181x²

Conclusions:

According to EU A5 criteria, as the result is below the threshold value of 60 mN/m, the substance is considered to have surface-active potential under the experimental conditions.

Executive summary:

The surface tension of the test substance was measured under GLP according to OECD 115/EU A5 guidelines, using OECD harmonised ring method. Seven readings were recorded, and the mean value was corrected with calibration factor from water.

The surface tension of a 1 g/L aqueous solution of test substance was found to be 37.5 mN/m at 20°C.

Description of key information

According to EU A5 criteria, as the result is below the threshold value of 60 mN/m, the substance is considered to have surface-active potential under the experimental conditions. However, since the structure is not characteristic of a true surfactant, and it is not the intended use of the substance (i.e. not a desired property), this conclusion should be taken with caution.

Key value for chemical safety assessment

Surface tension:

37.5

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

1 000

Additional information

A fully reliable GLP experimental study, conducted according to a recognized OECD/EU method, is available. Therefore, it is considered as a key study, and the result is retained as key value.