Potassium 3,5,5-trimethylhexanoate

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

GLP compliance:

no

Type of method:

OECD harmonised ring method

Specific details on test material used for the study:

Name: Potassium 3,5,5-trimethylhexanoate
CAS No.: 93918-10-6
Batch No.: PURS151015
Purity: 99.4%
Physical State: solid
Colour: white
Molecular Weight: 196.33 g/mol
Storage Conditions: room temperature
Re-certification Date: 14 October 2016

Key result

Surface tension:

60 mN/m

Temp.:

20 °C

Conc.:

1 g/L

An automatic tensiometer with a built-in evaluation unit was used, which performed the necessary corrections using the Harkins & Jordan method. The values only had to be corrected by the calibration factor determined at water calibration.

For this test the “ring-method” was used. For the quality assurance some measurements were carried out with the tensiometer. The balance in the tensiometer was controlled with a test by means of a nickel weight with 200 mg and 500 mg. The results were within the tolerances. By using the plate method together with n-Hexane it was possible to control the correct function of the instrument. The determined result was in the expected range. The water test – by using the platinum ring – was necessary to achieve the factor for the mathematical correction of the sample result.

The sample was dissolved into water (1 g/l), conditioned for 10 min in an ultrasonic bath and tempered at 20 °C and. Then the automatic measurement was initiated. The practical test performance was based on the in-house test procedure 34N10001.01: “Determination of Surface Tension of aqueous solutions”. Two different solutions with a concentration of 1 g/l where prepared. The surface tension should be measured, if the solutions are in an equilibrium state. The average of 6 single measurements was determined per solution. In this case the total measuring time was more than 15000 s per solution. Solution 1 and 2 were in Equilibrium after approx. 15000 s.

Water calibration:

Arithmetic mean 71.7 mN/m, standard deviation 0.1 mN/m from 6 measurements (theoretical value: 72.6 mN/m -> correction factor 1.0126).

First test solution:

(c= 1.028 g/l), Temp. = 20 °C, rho = 0.998 g/cm3, age of the solution = 1209 min)

Arithmetic mean 59.5 mN/m, standard deviation 0.0 mN/m from 6 measurements

Second test solution:

(c= 1.037 g/l), Temp. = 20 °C, rho = 0.998 g/cm3, age of the solution = 1559 min)

Arithmetic mean 59.0 mN/m, standard deviation 0.0 mN/m from 6 measurements

Arithmetic mean of two test solutions:                                                                                   59.3 mN/m (± 0.4 mN/m)

Arithmetic mean corrected by calibration factor determined via water calibration:                   60.0 mN/m

Conclusions:

The test item Potassium 3,5,5-trimethylhexanoate has a surface tension of 60.0 mN/m (concentration = 1 g/l).

Executive summary:

The surface tension of the test item Potassium 3,5,5-trimethylhexanoate was determined in accordance with the test method A.5. "Surface Tension" as described in the Commission Regulation (EC) No 440/2008 of 30 May 2008 laying down test methods pursuant Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), also similar to OECD guideline for testing of chemicals OECD 115. The test item Potassium 3,5,5-trimethylhexanoate has a surface tension of 60.0 mN/m (concentration = 1 g/l).

Description of key information

The surface tension of the test item Potassium 3,5,5-trimethylhexanoate was determined in accordance with the test method A.5. "Surface Tension" as described in the Commission Regulation (EC) No 440/2008 of 30 May 2008 laying down test methods pursuant Regulation (EC) No 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), also similar to OECD guideline for testing of chemicals OECD 115. The test item Potassium 3,5,5-trimethylhexanoate has a surface tension of 60.0 mN/m (concentration = 1 g/l).

Key value for chemical safety assessment

Surface tension:

60

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

1 000