Dodecylphosphonic acid

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Also in accordance to GLP

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

surface tension of distilled water (control) = 70.9 mN/m instead of 71.0 mN/m. Considered to not affect the validity of the study.

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

yes

Remarks:

surface tension of distilled water (control) = 70.9 mN/m instead of 71.0 mN/m. Considered to not affect the validity of the study.

GLP compliance:

yes (incl. QA statement)

Remarks:

2015-07-28

Type of method:

ring method

Surface tension:

24.4 mN/m

Temp.:

20.1 °C

Conc.:

1 g/L

Verification with distilled water

Temperature (°C)	20.0
Time	Surface tension (mN/m)
After 19 s	71.17 *
After 80 s	70.98
After 141 s	70.91
After 203 s	70.89
Result	70.9

*value not taken into account (SD>0.1 mN/m between the three first values)

 

The mean surface tension of distilled water was 70.9 mN/m at 20.0 °C, measurement vessel was considered to be clean and ready for use.

Deviation: For EC A5 test, the measurements of surface tension for distilled water were out of the range defined for the verification of the cleanliness of the measurement vessel (70.9 mN/m instead of 71.0 mN/m). The quality criterium determined by DEFITRACES (standard deviation lower than 0.1 mN/m between three consecutive values) was 0.13 for the three first measurements but was lower than 0.1 for the three last measurements. Since this difference was very weak, the result was accepted.

This deviation was not considered to have affected the quality or the interpretation of

the results obtained.

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

Preparation of the solution:

A quantity of about 1.000 g (to the nearest 1 mg) of the test item was weighed into a 1000-mL volumetric flask and the volume was made up with distilled water. The solution was magnetically stirred during about 6 days and 21 hours.

 

Assay N° 1
Temperature: 20.2 °C
Time	Surface tension (mN/m)
After 23 s	24.82
After 84 s	24.74
After 145 s	24.74
Mean result	24.8

 

Assay N° 2
Temperature: 20.0 °C
Time	Surface tension (mN/m)
After 19 s	24.24
After 80 s	24.20
After 141 s	24.19
Mean result	24.2

 

Assay N° 3
Temperature: 20.1 °C
Time	Surface tension (mN/m)
After 18 s	24.23
After 79 s	24.19
After 140 s	24.20
Mean result	24.2

 

Conclusions:

The mean surface tension of the test item diluted at 1 g/L in distilled water at 20.1 °C was 24.4 mN/m.

Following EC A5 method, the test item was considered as surface-active in the experimental conditions used.

Executive summary:

In a GLP study following the OECD guideline, the Surface Tension of the dodecylphosphonic acid was determinated to be 24.4 mN/m at 20.1 °C

Description of key information

The surface tension was determined to be equal to 24.4 mN/m at 20 °C and a concentration of 1g/L

Key value for chemical safety assessment

Surface tension:

24.4

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

1 000

Additional information

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