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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:

From October 20, 2017 to February 15, 2018

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

non-GLP and not determined for 90% saturated solution as required by the Guideline

Reason / purpose for cross-reference:

reference to same 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:

no

Remarks:

The study was conducted in a facility which operates in accordance with Good Laboratory Practice principles; however no claim of GLP compliance was intended nor is made for this study

Type of method:

ring method

Key result

Surface tension:

ca. 42.8 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Results

The readings and temperatures for the sample solutions are shown in the following table:

Table1: Surface tension values

Concentration (mg/L)	Reading (mN/m)	Temperature (°C)
3.301 x 10^3	40.0	20.0
	40.0	20.0
	40.0	20.0
990.2	42.5	20.0
	43.0	20.0
	43.0	20.0
297.0	46.5	20.0
	48.0	20.0
	48.5	20.0
	48.5	20.0
178.2	53.5	20.0
	53.5	20.0
	54.0	20.0
99.02	60.0	20.0
	62.5	20.0
	62.0	20.0
	62.5	20.0
59.41	68.5	20.0
	70.0	20.0
	71.0	20.0
	71.0	20.0
	71.0	20.0
29.70	72.0	20.0
	72.0	20.0
	72.0	20.0
9.902	73.0	20.0
	73.0	20.0
	73.0	20.0

Mean surface tension values were based on the last three readings for a particular concentration which were considered to be constant. The concentration (mg/L), log₁₀ [concentration (mg/L)] and mean surface tension values for the sample solutions are shown in the following table:

Table 2: The concentration (mg/L), log₁₀ [concentration (mg/L)] and mean surface tension values

Concentration (mg/L)	Log10Concentration	Mean Surface Tension (mN/m)	Solution pH
3.301 x 10^3	3.519	40.0	4.41
990.2	2.996	42.8	4.68
297	2.473	48.3	5.68
178.2	2.251	53.7	5.73
99.02	1.996	62.3	5.45
59.41	1.774	71.0	6.16
29.70	1.473	72.0	5.79
9.902	0.996	73.0	6.02

The surface tension at 1 g/L was determined to be 42.8 ± 0.5 mN/m.

Conclusions:

Under the study conditions, the surface tension of a 1 g/L nominal test concentration in water was determined to be 42.8 ± 0.5 mN/m at 20 ± 0.5ºC; therefore it is surface-active.

Executive summary:

A study was conducted to determine the surface tension of the test substance using the ring method, according to OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension of 1 g/L nominal test concentration in water was determined to be 42.8 ± 0.5 mN/m at 20 ± 0.5ºC. Therefore, the test substance was considered to be surface-active (Envigo, 2018).

Description of key information

The surface tension of the test substance was determined using ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:

42.8

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

1 000

Additional information

(surface active)