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Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2018-02-06 to 2018-03-05

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:

OECD harmonised ring method

Key result

Surface tension:

33.5 mN/m

Temp.:

20 °C

Conc.:

1 g/L

The results of two measurements are summarized below

Measured surface tension values

Value No.	1^stMeasurement s[mN/m]	2^ndMeasurement s[mN/m]
1	33.84	33.38
2	33.80	33.35
3	33.78	33.32
4	33.76	33.30
5	33.73	33.27
6	33.70	33.26
Mean value of the individual values	33.77 ± 0.05	33.31 ± 0.05
Total mean value	33.54 ± 0.32

The aqueous solution of the test item has a mean surface tension of 33.5 mN/m. Thus, the test item is to be regarded as surface active.

 

Conclusions:

The surface tension at 20 °C and at a concentration 1 g/L of the test item was determined to be 33.5 mN/m.

Executive summary:

A study was conducted according to OECD TG 115, Regulation (EC) No 440/2005 Part A, A.5, ASTM D1331-11 and ISO 304 (1985) to determine the surface tension of an aqueous solution of the test item using the ring method. A test solution of the test item was prepared in distilled water. For this purpose 100 mL double distilled water were added to 100.05 mg. Since, the test item was completely dissolved, this solution was measured twice. The solution to be measured was transferred into the measurement vessel and the measurement vessel was placed on the table of the test apparatus. The temperature was adjusted and kept at 20 °C. The time passed between both measurements was 9 minutes. The first measurement lasted for 9 minutes and the second for 15 minutes. The surface tension at 20 °C and at a concentration 1 g/L of the test item was determined to be 33.5 mN/m. Thus, the test item has to be regarded as surface active material.

Description of key information

The surface tension at 20 °C and at a concentration 1 g/L of the test item was determined to be 33.5 mN/m.

Key value for chemical safety assessment

Surface tension:

33.5

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

1

Additional information

A study was conducted according to OECD TG 115, Regulation (EC) No 440/2005 Part A, A.5, ASTM D1331-11 and ISO 304 (1985) to determine the surface tension of an aqueous solution of the test item using the ring method. A test solution of the test item was prepared in distilled water. For this purpose 100 mL double distilled water were added to 100.05 mg. Since, the test item was completely dissolved, this solution was measured twice. The solution to be measured was transferred into the measurement vessel and the measurement vessel was placed on the table of the test apparatus. The temperature was adjusted and kept at 20 °C. The time passed between both measurements was 9 minutes. The first measurement lasted for 9 minutes and the second for 15 minutes. The surface tension at 20 °C and at a concentration 1 g/L of the test item was determined to be 33.5 mN/m. Thus, the test item is to be regarded as surface active material.