Didecyldimethylammonium chloride

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Septemeber 7, 2001

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

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Type of method:

plate method

Key result

Surface tension:

ca. 27 mN/m

Temp.:

20 °C

Conc.:

1 g/L

None

Conclusions:

The surface tension of the aqueous solution of the test substance was determined to be 27 mN/m at 20°C.

Executive summary:

The surface tension of an aqueous solution of the test substance was determined according to OECD guideline 115 and in accordance with EEC-guideline 92169/EWG A.5, Surface tension, plate method. Therefore a solution of the test substance in water with a concentration of 1 g/L was prepared. After the solution had been filled into the vessel of the apparatus, the measuring procedure was begun and repeated until the value of surface tension remained nearly constant. The surface tension of the test substance was calculated from the mean value of the last five measured values and in consideration of the calibration factor of the apparatus. The surface tension was determined to be 27 mN/m at 20°C.

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 Nov, 2006 - Feb 26, 2007

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

Cited as Directive 84/449/EEC, A.5

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

ring method

Key result

Surface tension:

ca. 25.82 mN/m

Temp.:

20 °C

Conc.:

1 g/L

CMC result: 0.65 g/L

Conclusions:

For the purified substance the surface tension and the CMC were determined to be 25.82 +/- 0.01 mN/m and 0.65 g/L respectively.

Executive summary:

The surface tension of the test substance was determined according to OECD guideline 115 and EU method A.5. The critical micelle concentration was also determined. 1 g/L (total volume 200 mL), prepared in double distilled water, was used to determine the surface tension in 10 measurements. Different concentrations of the test item in the range of 0.2 to 1 g/L (total volume 200 mL), prepared in double distilled water, were applied for the determination of critical micelle concentration at a temperature of 20°C. For the purified substance the surface tension and the CMC were determined to be 25.82 +/- 0.01 mN/m and 0.65 g/L respectively.

Description of key information

The surface tension of the test substance was determined according to OECD Guideline 115 and EU Method A.5 for the purified solid (Schulze, 2007) and aqueous (Schneider, 2001) forms.

Key value for chemical safety assessment

Surface tension:

25.82

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

0.65

Additional information

- The surface tension was determined to be 25.82 +/- 0.01 mN/m for the purified solid form and 27 mN/m for the aqueous solution at 20°C.

- Data presented in the DDAC assessment report for Product Type 8 conducted under Directive 98/8/EC (evaluating Competent Authority: Italy, June 2015, attached in Section 13 of the IUCLID dataset) reported an additional surface tension study indicating 27.0 mN/m at 20°C (test solution: 1 g/L aqueous solution).

 

As the values are quite comparable, the surface tension value of 25.82 g/L derived from the purified form of the registered substance has been considered further for hazard/risk assessment.