Trisodium bis[4-[4,5-dihydro-4-[(2-hydroxy-5-nitrophenyl)azo]-3-methyl-5-oxo-1H-pyrazol-1-yl]benzene-1-sulphonato(3-)]cobaltate(3-)

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

August 14th 2019

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)

Version / remarks:

2012

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2008

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2002/ this guideline does also apply to the results

GLP compliance:

yes (incl. QA statement)

Type of method:

pycnometer method

Remarks:

gas comparison pycnometer

Type:

relative density

Remarks:

Test. 1

Density:

1.737 g/cm³

Temp.:

20 °C

Type:

relative density

Remarks:

Test. 2

Density:

1.735 g/cm³

Temp.:

20 °C

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

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	11.20464	6.45203	1.73661
2	20	11.40533	6.57491	1.73467

* 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 1.7356 g/cm³. The relative density D₄²⁰is calculated by dividing the density of the test item by the density of water at 4 °C (0.9999750 g/cm³).

The relative density is D₄²⁰= 1.736.

Conclusions:

Relative density of the test item at 20 °C ± 0.01 °C (compared to water at 4 °C) is D420 = 1.736.

Executive summary:

Test principle: the density of solids is determined with a calibrated gas comparison pycnometer at a temperature of 20 ± 0.01 °C. A pressurized gas (He) is expanded from a pressurized reference chamber into a sample chamber in which the test item is placed under atmospheric pressure. The volume of the sample chamber (25.1 cm³) as well as the volume of the reference chamber (21.4 cm³) are exactly known. The free volume of the sample chamber into which the gas is expanded can be calculated by the ideal gas law. With the free gas volume of the sample chamber, the volume of the test item in the sample chamber can be calculated by subtracting the free gas volume from the total chamber volume. By measuring the mass of the test item, the density is determined. The relative density D₄²⁰ is obtained by dividing the measured density of the test item by the density of water at 4 °C (0.9999750 g/cm³).

According to OECD guidelines 109 (2012), the relative density D₄²⁰ of the test item at 20 °C ± 0.01 °C (compared to water at 4 °C) is D₄²⁰ = 1.736.

Description of key information

relative density D₄²⁰of the test item at 20 °C ± 0.01 °C (compared to water at 4 °C) is D₄²⁰= 1.736.

Key value for chemical safety assessment

Relative density at 20C:

1.736

Additional information

OECD guideline 109.