Niobium hydride

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

01 October 2018 to 10 January 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Version / remarks:

2016

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

2012

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

2002

Deviations:

no

GLP compliance:

yes

Type of method:

pycnometer method

Key result

Type:

density

Density:

7.68 g/cm³

Temp.:

20 °C

Key result

Type:

relative density

Density:

7.68 other: Dimensionless

Temp.:

20 °C

The individual measurements were obtained with an accuracy of < 0.02 g/cm³. According to the guideline, the density of the test material is given as the mean value.

Density of the Test Material

	Test 1	Test 2	Mean
Density [g/cm³]	7.682	7.687	7.68

Conclusions:

Under the conditions of the study the density of the test material at 20°C was 7.68 g/cm³. The relative density was 7.68.

Executive summary:

The relative density of the test material was assessed according to OECD Test Guideline 109, EU Method A.3, and US EPA OPPTS 830.7300, under GLP conditions, using a pycnometer method.

The density (ρ) and relative density (D4^20) of the test material were determined using a gas comparison stereopycnometer. With this method the volume of the test material is measured in helium gas in a calibrated cylinder.

The test material was reduced by grinding using a mortar and dried in a desiccator under vacuum using silicagel as the drying agent at 19.4 ± 0.2°C protected from light for 43 hours.

The sample cell was filled with ground test material, weighed and placed in the gas comparison pycnometer. The mean volume of the test material sample was determined (n = 4). Thereafter the sample cell was weighed again. The density of the test material was calculated, using sample weight before measurement and mean volume. The test was performed in duplicate. The mean density and relative density of the test material were calculated.

Measurements were performed at 20.0 ± 0.5°C. Weighing was performed on an analytical balance with an accuracy of 0.1 mg. On the day of measurement the validity of the gas comparison pycnometer was verified using a calibration ball with a known volume of 14.36886 cm³.

The relative density D4^20 is the ratio between the mass of a volume of a substance to be examined, determined at 20°C, and the mass of the same volume of water, determined at 4°C (ρH2O^4 = 1 000 kg/m³). 

Under the conditions of the study, the density of the test material at 20ºC was 7.68 g/cm³. The relative density was 7.68.

Description of key information

Under the conditions of the study, the density of the test material at 20°C was 7.68 g/cm³. The relative density was 7.68.

Key value for chemical safety assessment

Relative density at 20C:

7.68

Additional information

The relative density of the test material was assessed according to OECD Test Guideline 109, EU Method A.3, and US EPA OPPTS 830.7300, under GLP conditions, using a pycnometer method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The density (ρ) and relative density (D4^20) of the test material were determined using a gas comparison stereopycnometer. With this method the volume of the test material is measured in helium gas in a calibrated cylinder.

The test material was reduced by grinding using a mortar and dried in a desiccator under vacuum using silicagel as the drying agent at 19.4 ± 0.2°C protected from light for 43 hours.

The sample cell was filled with ground test material, weighed and placed in the gas comparison pycnometer. The mean volume of the test material sample was determined (n = 4). Thereafter the sample cell was weighed again. The density of the test material was calculated, using sample weight before measurement and mean volume. The test was performed in duplicate. The mean density and relative density of the test material were calculated.

Measurements were performed at 20.0 ± 0.5°C. Weighing was performed on an analytical balance with an accuracy of 0.1 mg. On the day of measurement the validity of the gas comparison pycnometer was verified using a calibration ball with a known volume of 14.36886 cm³.

The relative density D4^20 is the ratio between the mass of a volume of a substance to be examined, determined at 20°C, and the mass of the same volume of water, determined at 4°C (ρH2O^4 = 1 000 kg/m³). 

Under the conditions of the study, the density of the test material at 20ºC was 7.68 g/cm³. The relative density was 7.68.