Amines, C12-14-alkyl, C6-10-alkyl 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:

2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

plate method

Key result

Surface tension:

>= 35.42 - <= 36.8 mN/m

Temp.:

22.2 °C

Conc.:

257.24 mg/L

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	4.1	0.2969	72.43	22.2
2	5.1	0.2965	72.33	22.2
3	6.1	0.2964	72.31	22.2
4	7.2	0.2964	72.31	22.2
5	8.1	0.2967	72.38	22.2
6	9.1	0.2963	72.28	22.2
7	10.1	0.2966	72.35	22.2
8	11.1	0.2965	72.33	22.2
9	12.1	0.2964	72.31	22.2
10	13.1	0.2963	72.28	22.2
Mean			72.33
Standard Deviation			0.05

The values of the single determinations show no significant difference (0.25% between mean values of the two measurement series). All measured values lay clearlybelowthe threshold for surface tension which is stated in the guidelines.

The surface tension of the negative control was determined with a difference of 0.10 % from the stated literature value.

Therefore, the result of the test is considered valid and the test itemDeophos 228is classified as “surface active” in a concentration of 257.24 mg/L (in a solution at 90% saturation obtained from an aqueous solution prepared with 1.00 g/L of test item shaking for 72h at 18.5 – 23.7 °C in a closed Schott-flask at 150 rpm..

Conclusions:

During the specified period of time, no significant changes in the surface tension were detected. Values ranging from 35.42 mN/m to 36.84 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference 0.25 % between mean values of the two measurement series). As the determined surface tension of Deophos 228 was lower than 60 mN/m, the test item can be classified as surface active.

Executive summary:

The surface tension of an aqueous solution of Deophos228 was determined as 35.72 ± 0.40 mN/m at 20.4 °C. One measurement was performed for verification (after 59 minutes). No significant changes and thus no significant dependence on time was observed. As these values were lower than 60 mN/m, Deophos228 was classified as surface active. The surface tension of the negative control lay within the accepted range. The concentration of the test item in the 90% saturated test solution was determined with 257.24 mg test item/L (based on analysis of dissolved organic carbon in the test solution). The saturated solution was obtained from an aqueous solution prepared with 1.00 g/L of test item shaking for 72h at 18.5 – 23.7 °C in a closed Schott-flask at 150 rpm.

Description of key information

The surface tension was determined according to OECD Guideline 115.

Key value for chemical safety assessment

Surface tension:

35.72

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

257.24