Sodium 1-(3,4-dihydro-6-methyl-2,4-dioxo-2H-pyran-3-ylidene)ethanolate

Density

Link to relevant study record(s)

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

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7300 (Density / Relative Density / Bulk Density)

GLP compliance:

yes (incl. QA statement)

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