Ethyl [2-(4-phenoxyphenoxy)ethyl]carbamate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

16 Feb 1992

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)

Qualifier:

according to guideline

Guideline:

other: ISO 304 ("Surface active agents - Determination of Suface Tension by Drawing up Liquid Films")

GLP compliance:

yes

Type of method:

plate method

Remarks:

The Wilhelmy plate method was preferred because it allows a better assessment of the time dependence of the surface tension, if present.

Key result

Surface tension:

>= 56.7 - <= 57.6 mN/m

Temp.:

20 °C

Conc.:

10 g/L

Remarks on result:

other: results based on two experiments

RESULTS

Surface tension by the Wilhelmy plate method: (ISO 304)

- Temperature: 20 ± 0.3 °C

- 1. Solution prepared: date 16 Feb 1992, time 10.55

- 1. Solution measured: date 16 Feb 1992, time 14.30

- 2. Solution prepared: date 16 Feb 1992, time 11.00

- 2. Solution measured: date 16 Feb 1992, time 15.10

- Time dependence of surface tension observed: no

Correction factor (Ob)

Ob = 72.75/ (σ water,exp) = 72.75/ 73.45 = 0.991

Table 1 Experiment 1

Concentration (g/L)	σ (solution) mN/m		σ corr. for Ob (nN/m)
	min	readings
Filtrate of a 10.02 g/L suspension	0	57.7	57.2
	1	57.7	57.2
	5	58.0	57.5
	10	58.0	57.5
	15	58.2	57.7
	20	58.5	58.0
	25	58.8	58.3
			57.6

Table 2 Experiment 2

Concentration (g/L)	σ (solution) mN/m		σ corr. for Ob (nN/m)
	min	readings
Filtrate of a 10.01 g/L suspension	0	56.9	56.4
	1	56.8	56.3
	5	57.2	56.7
	10	57.3	56.8
	15	57.3	56.8
	20	56.4	56.9
			56.7

A Harkins-Jordan correction is required by the test guideline for measurements on aqueous solutions by the ring method. This hydrostatic correction is, however, not necessary when using the Wilhelmy plate method.

Conclusions:

The surface tension of the duplicate filtrate of a 10 g/L suspensions of test substance in water has been determined to range between 56.7 - 57.6 mN/m at 20 °C.

Executive summary:

The surface tension of the test substance has been determined using the Wilhelmy plate method in accordance with OECD TG 115 and in compliance with GLP. The surface tension of the duplicate filtrate of at 10 g/L suspensions of test substance in water has been determined in the range of 56.7 and 57.6 mN/m at 20 °C

Description of key information

57.2 N/m at 20 °C for a filtrate of a 10 g/L suspension, OECD TG 115, Wilhelmy plate method, Ryser 1992.

Key value for chemical safety assessment

Surface tension:

57.2

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

10 000