Tall oil, maleated

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017

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

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Specific details on test material used for the study:

Viscous brown liquid

Key result

Surface tension:

54.5 mN/m

Temp.:

20 °C

Conc.:

90 vol%

The results of the test on the determination of the surface tension of the test solution are given in Table 1.

Table 1:    
Surface Tension of the test item

Measurement	Time passed after transfer test solution to test vessel [minutes]	Surface tension (mN/m)
		individual	mean	mean multiplied by Φband Harkins-Jordan corrected value
1	20	50.0	54.0^1	54.5
2	21	51.8
3	22	52.3
4	23	52.8
5	24	53.8
6	25	54.2
7	26	54.2
8	27	54.1
9	28	53.8

¹         Mean calculated from measurements 5 to 9, after equilibrium was reached.

The mean surface tension of the test solution was multiplied by the calibration factor followed by correction according to Harkins-Jordan. Interpolation was used for readings ranging between the table values.

Calibration factor (Φ_b)                                   
  where:   σ_o surface tension of water at the test temperature cited in the literature i.e. 72.77 mN/m at 19.8 °C (Vargaftik,et. al., J. Phys. Chem. Ref. Data 12, 817, 1983)  σ_m mean surface tension of double distilled water obtained on the day of measurement

Text Table 4
Correction of the measured surface tension according to Harkins-Jordan

Experimental value [mN/m]	Corrected value [mN/m]	Experimental value [mN/m]	Corrected value [mN/m]
20	18.1	50	48.6
22	20.1	52	50.7
24	22.1	54	52.8
26	24.1	56	54.9
28	26.1	58	57.0
30	28.1	60	59.1
32	30.1	62	61.3
34	32.1	64	63.4
36	34.1	66	65.5
38	36.1	68	67.7
40	38.2	70	69.9
42	40.3	72	72.0
44	42.3	74	74
46	44.4	76	76
48	46.5	78	78

W.D. Harkins, H.F. Jordan, J. Amer. Chem. Soc., vol. 52, 1751, 1930.

Conclusions:

The OECD harmonized ring method was applied for the determination of the surface tension of EnvaMul 600.
The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20 °C was 54.5 mN/m. According to this, the test item is considered to be surface active.

Executive summary:

The objective of this study was to determine physico-chemical properties for EnvaMul 600.

The Surface tension, determined according to method EC A.5 / OECD 115, was found to be 54.5 mN/m at 20 °C by the harmonized ring method, and thus, the substance is considered surface active.

Description of key information

The surface tension for EnvaMul 600 was determined according to the OECD Guideline 115. Surface Tension of Aqueous Solutions. The surface tension of a test solution at 90% of the test item saturation solubility in water and at 20 °C was 54.5 mN/m. According to this, the test item is considered to be surface active.

Key value for chemical safety assessment

Surface tension:

54.5