Fatty acids, C16-18 (even numbered), ammonium salts

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

July 4, 2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

- Principle of test: The ammonium salts of C16-18 (even numbered) fatty acids are produced in an aqueous dispersion with approx. 67% of water, 4% of the additive and 29% of ammonium salts. It is technically not feasible to isolate the substance due to the possible decomposition of component(s) during the warming process to remove the water. Moreover, still additives of preparation would be present at the dry sample. Therefore, the density measurement of Fatty acids, 16-18 (even numbered), ammonium salts was determined by calculation of density differences between the preparation in water dispersion and the additve by a pycnomether method (UNE 55-702-82).

GLP compliance:

no

Type of method:

pycnometer method

Key result

Type:

relative density

Density:

ca. 0.948 g/cm³

Temp.:

25 °C

The density of Fatty acids, C16-18 (even numbered), ammonium salts was determined to be 0.9479 ± 0.0009 g/ml.

The obtained results were as follows:

SAMPLE	Aqueous dispersion of FA C16-18 NH4 (g/ml)	Additive (g/ml)	FA C16-18 NH4 (g/ml)
SAMPLE 1	0.9938	1.1220	0.9489
SAMPLE 2	0.9919	1.1196	0.9471
SAMPLE 3	0.9924	1.1204	0.9476
AVERAGE	0.9927 ± 0.0010	1.1207 ± 0.0012	0.9479 ± 0.0009

Taking into consideration that the aqueous dispersion of the ammonium salts contains 4% of additives, the density of the 4% of the additive was subtracted by the following formula:

Density = A - 4/100 * B where,

Density: Density of Fatty acids, C16-18 (even numbered), ammonium salts

A: Density of aqueous dispersion of Fatty acids, C16-18 (even numbered), ammonium salts

B: Density of the additive

Conclusions:

The density of Fatty acids, C16-18 (even numbered), ammonium salts was determined to be 0.9479 g/ml.

Executive summary:

The determination of the density of Fatty acids, C16 -18 (even numbered), ammonium salts was performed by a pycnomemter method (UNE 55-702-82). The density at 25 ºC was determined to be 0.9479 g/ml.

Description of key information

Key study: Pycnometer method (UNE 55-702-82). The density of Fatty acids, C16 -18 (even numbered), ammonium salts at 25 ºC was determined to be 0.9479 g/ml.

Key value for chemical safety assessment

Relative density at 20C:

0.948

Additional information

Key study: The density of Fatty acids, C16 -18 (even numbered), ammonium salts was measured by the pycnometer method (UNE 55 -702 -82). The density was determined to be 0.9479 g/ml at 25 ºC.