Reaction products of bis([tetrakis(hydroxyalkyl)phosphonium] sulfate and alkanamine with Urea

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 2016-04-26 to 31/08/2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

2015-07-28

Type of method:

ring method

Key result

Surface tension:

25.3 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Interpretation

Considering that distilled water has a theoretical surface tension of 72.75 mN/m at 20 °C, test items showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface-active materials.

 

Verification with distilled water

 

Temperature(°C)	19.6
Time	Surface tension (mN/m)
After 23 s	71.01
After 83 s	70.96
After 144 s	70.97
Mean result	71.0

 

The first verification was not taken into account as it did not comply with the quality criteria.

The mean surface tension of distilled water was 71.0 mN/m at, measurement vessel was considered to be clean and ready for use.

 

Measurements on the test item diluted at 1 g/L in distilled water

 

Preparation of the solution:

A volume of the test item was sampled into a 500-mL volumetric flask and the volume was made up with distilled water. The solution was magnetically stirred during 4 hours and 55 min.

 

 

Assay No. 1		Assay No. 2		Assay No. 3
Temperature: 19.9 °C		Temperature: 19.8 °C		Temperature: 20.2 °C
Time	Surface tension (mN/m)	Time	Surface tension (mN/m)	Time	Surface tension (mN/m)
After 20 s	24.64	After18 s	24.54	After20 s	25.31
After 81 s	24.83	After 79 s	24.76	After 82 s	25.37
After 142 s	25.00	After 140 s	25.03	After 144 s	25.35
After 203 s	25.11	After 200 s	25.16
After 264 s	25.15	After 261 s	25.26
		After 322 s	25.38
		After 383 s	25.45
Mean result	25.1	Mean result	25.4	Mean result	25.3

 

Conclusions:

The mean surface tension of the test item diluted at 1 g/L in distilled water at 20.0 °C was 25.3 mN/m.

The test item was considered as surface-active in the experimental conditions used.

Executive summary:

The surface tension of Phosphonium, tetrakis(hydroxymethyl) -, sulphate (2:1), reaction products with 1-tetradecanamine and urea has been determined according to EC A.5 method and OECD test guideline 11 in compliance with GLP.

A ring method was used for the determination of the surface tension. The surface tension was 23.5 mN/m at 20°C.

Description of key information

The surface tension was determined to be equal to 25.3 mN/m at 21.6°C and 1g/L

Key value for chemical safety assessment

Surface tension:

25.3

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

1 000

Additional information

An experimental study, scored at Klimisch 1, was selected as a key study. It was performed in compliance with GLP acoording to EC A.5. test method and OECd 115 test guideline.