Phosphoric acid, decyl octyl ester

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 19, 2017 to November 27, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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. 31 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)
1.006 x 10^3	31.0	19.8
	31.0	19.8
	31.0	19.8
301.8	33.0	20.0
	33.0	20.0
	33.0	20.0
100.6	34.5	20.0
	34.5	20.0
	34.5	20.0
30.18	36.0	20.0
	36.0	20.0
	36.0	20.0
15.09	44.5	20.2
	44.5	20.2
	44.5	20.2
10.06	45.5	20.0
	46.5	20.0
	47.0	20.0
	48.5	20.0
	48.5	20.0
	48.5	20.0
7.545	50.5	20.4
	52.0	20.4
	53.0	20.4
	54.0	20.4
	54.0	20.4
	54.0	20.4
5.030	54.0	20.2
	56.0	20.2
	56.0	20.2
	56.5	20.2
	56.5	20.2
	56.5	20.2
3.018	59.5	20.0
	62.0	20.0
	63.5	20.0
	64.5	20.0
	64.5	20.0
	65.5	20.0
	65.5	20.0
	65.5	20.0
1.006	70.5	20.0
	71.5	20.0
	72.0	20.0
	72.0	20.0
	72.0	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
1.006 x 10^3	3.003	31.0	2.75
301.8	2.480	33.0	3.14
100.6	2.003	34.5	3.49
30.18	1.480	36.0	3.89
15.09	1.179	44.5	4.45
10.06	1.003	48.5	4.27
7.545	0.878	54.0	4.86
5.030	0.702	56.5	4.95
3.018	0.480	65.5	4.75
1.006	0.003	72.0	5.00

The surface tension at 1 g/L was determined to be 31.0 ± 0.5mN/m.

Conclusions:

Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 31.0 ± 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, mono- and di- C8-10 PSE, using ring method, according to OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 31.0 ± 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:

31

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

20

Additional information

(surface active)