Amines, C12-14-tert-alkyl, mixed sec-Bu and iso-Bu phosphates

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 Feb - 10 Mar 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: ISO 4311:1979

GLP compliance:

yes (incl. QA statement)

Remarks:

Ministerium für Arbeit, Integration und Soziales des Landes Nordrhein-Westfalen, Düsseldorf, Germany

Type of method:

ring method

Specific details on test material used for the study:

Storage: at room temperature; dry; tightly closed; well ventilated

Surface tension:

42.9 mN/m

Temp.:

20 °C

Conc.:

0.66 g/L

Remarks on result:

other: The test item is surface active.

Results

Concentration of the test item in deionized water [g/L]	Surface tension [mN/m]	Mean value [mN/m]	pH value
0.66	43.09	42.9	4.1
	42.65
0.3	50.16	50.1	-
	50.12
0.1	57.37	57.6	-
	57.85
0.05	62.12	62.4	-
	62.73
0.01	68.68	69.0	6.2
	69.34

 

The mean surface tension of the aqueous preparation of the test item (c = 0.66 g/L) at 20 °C was found to be 42.9 mN/m. The test item is surface-active.

A curve was plotted taking the surface tension values as ordinates and the logarithms of the concentrations (in g/L) was abscissae. The CMC would correspond to the point of the curve at which a sharp change of slope occurs. This could not be observed. Therefore, a CMC could not be determined.

It was tried to produce a stock solution with a higher amount of the test item following the procedure described above. The test item was warmed up for 30 min at 80 °C in a drying cabinet. Then 2.1885 g of test item were weighed out and filled to 1000 mL with deionized water (concentration = 2.2 g/L). Also this stock solution was stirred at 49 – 51 °C for 24 h. But after this procedure the test item was visually not completely dissolved. As the highest tested concentration was closed to the maximum solubility of the test item, no further test concentrations were investigated.

After discussion with the study monitor, it was decided to stop the experiments.

Conclusion
The mean surface tension of the aqueous preparation of the test item (c = 0.66 g/L) at 20 °C was found to be 42.9 mN/m. The test item is surface active.

The critical micellar concentration (CMC) of the test item could not be determined with the ring method acc. to ISO 4311:1979 an under the test conditions used. No further test concentrations were investigated as the highest tested concentration was close to the maximum solubility of the test item.

Description of key information

42.9 mN/m at 20 °C and with a concentration of 0.66 g/L (ISO 4311:1979). The susbtance is surface active.

Key value for chemical safety assessment

Surface tension:

42.9

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

660

Additional information

The substance is surface-active.