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Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
August 15, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
GLP compliance:
no
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
density
Density:
1.35 g/cm³
Temp.:
20 °C
Key result
Type:
relative density
Density:
1.35 other: dimensionless
Temp.:
20 °C

Individual results

A measurement chamber with a volume of Vc= 141.8361 cm3 and an expansion chamber with a volume of Vr= 69.3167 cm3 were used. These volumes were selected to reduce a negative influence by heterogeneity of the test item on the measurement.

Two test series with different weights were performed at ambient temperature (20.0 °C). For results see Table1 and Table2.

Table1: Results of the 1sttest series

     Weight: 69.7394 g

p1/ psi

p2/ psi

Volume / cm3

DensityrPR/ g·cm-3

1stmeasurement

19.533

11.041

51.7130

1.3486

2ndmeasurement

19.563

11.058

51.7122

1.3486

3rdmeasurement

19.512

11.028

51.7342

1.3480

Mean

 

 

51.7198

1.3484

Table2: Results of the 2ndtest series

     Weight: 67.9453 g

p1/ psi

p2/ psi

Volume / cm3

DensityrPR/ g·cm-3

1stmeasurement

19.569

11.129

50.4350

1.3472

2ndmeasurement

19.598

11.146

50.4253

1.3474

3rdmeasurement

19.551

11.119

50.4305

1.3473

Mean

 

 

50.4302

1.3473

Mean density for the two test series: 1.3479 g/cm3

Relative density (compared to water at 4 °C):

D4R= 1.35      (20.0 °C)

Conclusions:
The relative density at ambient temperature (compared to water at 4 °C) was determined to be:
D4R= 1.35      (20.0 °C)
Executive summary:

The density determination was performed with the gas comparison pycnometer according to OECD 109. The aparatus with a measured amount of the test item in the measurement chamber is swept 10 times with 19.5 psi Helium (purity min. 99.99 %) at a constant and

regulated environmental temperature. Thereafter, the valve to the expansion chamber (volume = Vr) is opened and a certain amount of gas expands from the measurement chamber (volume = Vc) containing the test item to the expansion chamber. The volume of the test item Vs is calculated of the pressure drop from p1to p2 caused by the gas expansion. Two individual test series containing three measurements were performed. The density was calculated from the mass of the sample and its measured volume for each measurementbwfore the results were averaged. The estimated accuracy of this method is ±0.01 g/cm³.

The relative density at ambient temperature (compared to water at 4 °C) was determined to be:

D4R= 1.35      (20.0 °C)

Description of key information

The density determination was performed with the gas comparison pycnometer according to OECD 109.

The relative density at ambient temperature (compared to water at 4 °C) was determined to be:

D4R= 1.35      (20.0 °C)

This information is used in a read-across approach in the assessment of the target substance.

For justification of read-across please refer to the attached read-across report (see IUCLID section 13).

Key value for chemical safety assessment

Relative density at 20C:
1.35

Additional information