Reaction mass of hexadecyl dihydrogen phosphate and cetyl alcohol (mono- C16 PSE and C16-OH)

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 16, 2017 to December 13, 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. 43.5 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)
3.003 x 10^3	39.0	20.4
	39.0	20.4
	39.0	20.4
1.005 x 10^3	43.5	20.2
	43.5	20.2
	43.5	20.2
615.2	41.5	20.0
	43.5	20.0
	43.5	20.0
	43.5	20.0
305.4	42.5	20.2
	42.5	20.2
	42.5	20.2
122.2	43.5	20.2
	45.0	20.2
	46.5	20.2
	46.5	20.2
	46.5	20.2
61.08	50.5	19.6
	50.5	19.6
	50.5	19.6
30.54	48.5	20.2
	48.0	20.2
	48.0	20.2
	48.0	20.2
18.33	61.0	19.6
	61.0	19.6
	61.0	19.6
12.22	57.5	20.4
	59.5	20.4
	59.5	20.4
	61.0	20.4
	61.0	20.4
	61.0	20.4
6.108	72.0	19.6
	72.0	19.6
3.054	72.0	20.4
	72.0	20.4
	72.0	20.4
1.222	72.5	20.4
	72.5	20.4
	72.5	20.4

Mean surface tension values were based on the last three readings for a particular concentration which were considered to be constant.

Theconcentration (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
3.003 x 10^3	3.478	39.0	2.88
1.005 x 10^3	3.002	43.5	3.14
615.2	2.789	43.5	3.33
305.4	2.485	42.5	3.53
122.2	2.087	46.5	3.85
61.08	1.786	50.5	4.06
30.54	1.485	48.0	4.36
18.33	1.263	61.0	4.51
12.22	1.087	61.0	4.64
6.108	0.786	72.0	4.72
3.054	0.485	72.0	5.12
1.222	0.087	72.5	5.36

The surface tension at 1 g/L was determined to be 43.5 ± 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 43.5 ± 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 ring method, according to the 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 43.5 ± 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 the ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:

43.5

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

1 000

Additional information

(surface active)