Phosphoric Acid, linear and branched Octyl Esters

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

21 July 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

not specified

Type of method:

ring method

Key result

Surface tension:

32.5 mN/m

Temp.:

20 °C

Conc.:

1 g/L

- Temperature differences were considered by entry of the density.

- Surface tension results are presented graphically in Diagram 1 (attached).

- Arithmetic mean of two test solutions = 32.0 ± 0.1 mN/M

- Arithmetric mean corrected by calibration factor determined via water calibration = 32.5 mN/m

Water calibration: Temperature 21 °C; ρ = 0.998 g/cm3

Surface tension of purified water
Value 1	71.3 mN/m
Value 2	71.5 mN/m
Value 3	71.4 mN/m
Value 4	71.3 mN/m
Value 5	71.3 mN/m
Value 6	71.4 mN/m
Arithmetic mean	71.4 mN/m
Standard deviation	0.1 mN/m

Arithmetic mean 71.4 mN/m; standard deviation 0.1 mN/m from the last six measurements (theoretical value: 72.4 mN/m; correction factor 1.0140).

First test solution: (c=1.460 g/L); Temperature = 22 °C; ρ = 0.998 g/cm3; age of solution 85 minutes

Surface tension of the solution
Value 1	31.9 mN/m
Value 2	31.9 mN/m
Value 3	31.9 mN/m
Value 4	31.9 mN/m
Value 5	31.9 mN/m
Value 6	31.9 mN/m
Arithmetic mean	31.9 mN/m
Standard deviation	0.0 mN/m

Arithmetic mean 31.8 mN/m; standard deviation 0.0 mN/m from six measurements

Second test solution: (c=1.026 g/L); Temperature = 21 °C; ρ = 0.998 g/cm3; age of solution 168 minutes

Surface tension of the solution
Value 1	32.0 mN/m
Value 2	32.1 mN/m
Value 3	32.0 mN/m
Value 4	32.1 mN/m
Value 5	32.1 mN/m
Value 6	32.1 mN/m
Arithmetic mean	32.1 mN/m
Standard deviation	0.0 mN/m

Arithmetic mean 32.1 mN/m; standard deviation 0.0 mN/m from six measurements

Conclusions:

The surface tension of the test item was determined to be 32.5 mN/m at 21 °C using a solution concentration of 1 g/L.

Executive summary:

The surface tension of the test item was measured in a study performed according to EU Method A.5 as described in Commission Regulation (EC) No. 440/2008 and OECD 115. The test was performed in duplicate using test item concentrations of 1g/L in HPLC Gradient Grade water at 21 °C. Measurements were made using solutions aged for 85 minutes (first test) and 168 minutes (second test). Six single measurements were made per solution over a measuring time of more than 2500 seconds per solution. Both solutions were in an equilibrium state after approximately 1500 seconds. The calibration factor-corrected mean surface tension was 32.5 mN/m.

Description of key information

The surface tension of the test item was determined to be 32.5 mN/m at 21 °C using a solution concentration of 1 g/L (OECD 115 and EU Method A.5).

Key value for chemical safety assessment

Surface tension:

32.5

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

1 000

Additional information

The surface tension of the test item was measured in a study performed according to EU Method A.5 as described in Commission Regulation (EC) No. 440/2008 and OECD 115. The test was performed in duplicate using test item concentrations of 1g/L in HPLC Gradient Grade water at 21 °C. Measurements were made using solutions aged for 85 minutes (first test) and 168 minutes (second test). Six single measurements were made per solution over a measuring time of more than 2500 seconds per solution. Both solutions were in an equilibrium state after approximately 1500 seconds. The calibration factor-corrected mean surface tension was 32.5 mN/m.