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Physical & Chemical properties

Density

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Reference
Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14 Sept to 22 Sept 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)
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Qualifier:
according to
Guideline:
EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)
GLP compliance:
yes (incl. certificate)
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
1.499 other: relative density is dimensionless
Temp.:
20 °C

The volume of the test item Vs is calculated by the device using the following equation:

Vs = Vcv + Vrz * ((pch – prh) / (pch – patmh))

With

Vs = volume of test item

Vcv = volume of the sample chamber

Vrz = volume of the reference chamber

Pch = pressure after expansion

Prh = pressure of the reference chamber before expansion

Patmh = pressuer of the sample chamber before expansion

To calculate the relative density D420 at 20 °C, the measured density of the test item pTI at 20 °C is divided by the density of water pw4 at 4 °C (0.9999750 g/cm³). The relative density at 20 °C D420 is calculated according to the following equation:

D420 = pTI / Pw4

D420: Relative density (without dimension) of the test item measures at a temperature of 20 °C compared to the density of water at 4 °C

pTI: Density of the test item measured at a temperature of 20 °C ± 0.01 °C in g/cm³

pw4: Density of water at 4 °C in g/cm³

Results

Relative density

Two tests with different amounts of the test item were performed to determine the relative density D420 at a temperature of 20 °C ± 0.01 °C.

Table: Results of the measurement of the density of the test item

Test No.

Temperature [°C]

Amount of test item [g]

Average sample volume [cm³]

Density [g/cm³]*

1

20

10.50

6.98803

1.50257

2

20

9.71

6.49483

1.49503

* The pressurizing-expansion cycles are performed until 5 subsequent volume measurements have a relative standard deviation (RSD) of ≤0.2 %.

The mean density of the test item at 20 °C is 1.4988 g/cm³. The relative density D420 is calculated by dividing the density of the test item by the density of water at 4 °C (0.9999750 g/cm³).

Relative density is D420 = 1.499

Description of key information

The substance dehydroacetic acid sodium salt has a relative density of 1.499 at 20 °C (OECD 109, gas comparison pycnometer).

Key value for chemical safety assessment

Relative density at 20C:
1.499

Additional information