Poly(oxy-1,2-ethanediyl), .alpha.-sulfo-.omega.-hydroxy-, C10-12-alkyl ethers, sodium salts

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

7 Mar 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

GLP compliance:

no

Type of method:

ring method

Surface tension:

34 mN/m

Temp.:

21 °C

Conc.:

1 g/L

Details:

Water calibration:

Water calibration: Temp. = 24 °C, σ = 0.997 g/cm³

Surface tension of purified water, mN/m
Value 1	71.3
Value 2	71.2
Value 3	71.2
Value 4	71.2
Value 5	71.2
Value 6	71.2
Arithmetic mean	71.2
Standard deviation	0.1

Arithmetic mean 71.0 mN/m, standard deviation 0.0 mN/m (theoretical value: 71.8 mN/m →correction factor 1.0113)

First test solution

(c = 1000.5 mg/L), Temp. = 21 °C, σ = 0.998 g/cm³, age of solution = 38 min)

Surface tension of solution 1, mN/m
Value 1	33.2
Value 2	33.2
Value 3	33.1
Value 4	33.1
Value 5	33.2
Value 6	33.2
Arithmetic mean	33.2
Standard deviation	0.0

Arithmetic mean 33.2 mN/m, standard deviation 0.0 mN/m

Second test solution

(c = 1007.0 mg/L), Temp. = 21 °C, σ = 0.998 g/cm³, age of solution = 45 min)

Surface tension of solution 2, mN/m
Value 1	34.5
Value 2	34.4
Value 3	34.2
Value 4	34.1
Value 5	34.2
Value 6	34.1
Value 7	34.1
Value 8	34.1
Arithmetic mean	34.1
Standard deviation	0.1

Arithmetic mean 34.1 mN/m, standard deviation 0.1 mN/m

By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.

Arithmetic mean of two test solutions:                    33.65 mN/m (+ 0.45 mN/m)

Arithmetic mean corrected by calibration factor

determined via water calibration:                            34.03 mN/m

The sample was dissolved in water and tempered at 20 °C. Then the automatic measurement was initiated. The measurement was completed after 200 seconds.

The surface tension was determined as a concentration of 1 g/L. The water solubility is unlimited. The solutions were clear and without any turbidity.

Description of key information

34.0 mN/m at 21 °C, concentration 1 g/L

Additional information

The surface tension was determined by the ring method according to EU test method A.5. (similar to OECD 115).

The substance should be regarded as being surface active material.