## Diss Factsheets

Physical & Chemical properties

## Density

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### Link to relevant study record(s)

#### Reference

Endpoint:
relative density
Type of information:
experimental study
weight of evidence
Study period:
2014-11-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Key result
Type:
relative density
Density:
1.987
Temp.:
20 °C

First step - Determination of the density of the immersion liquid (IL)

The density of the immersion liquid (IL), being silicone oil, has first to be calculated, using the equation and the parameters below, in order to calculate the density of the test item in a second step:

Equation: density (IL) = m(IL)/m(water) x density(water, at T °C)

With:

m = mass (kg);

density = density (kg/m3);

density(water, at T °C) = m(water) / volume of pycnometer

Mass of empty pycnometer: 20.92 g

Volume of pycnometer: 25.0 mL

Mass of water & pycnometer: 45.92 g

Mass of water: 45.92 – 20.92 = 25 g

Density of water: 25 / 25 = 1.000 g/cm³

Mass of IL & pycnometer: 44.61 g

Mass IL in pycnometer (m1): 44.61 – 20.92 = 23.69 g

Calculated density of IL: 23.69 / 25 x 1 = 0.948 g/cm³

Density of IL: 948 kg/m³

Second step - Determination of the density of the sample (S)

The density of the test item is then calculated using the equation and the parameters below:

Equation: density(S) = (m(S) x density(IL)) / (m1 - m2)

With:

density = density (kg/m3),

m(S) = mass of sample (kg),

m1 = mass of immersion liquid required to fill the pycnometer (kg),

m2 = mass of immersion liquid required to fill the pycnometer containing the sample (kg)

 Assay number 1 2 Mass of empty pycnometer 20.92 g 20.92 g Mass of sample & pycnometer 44.32 g 43.95 g Mass of sample added to empty pycnometer (m(S)) 23.40 g 23.03 g Mass of sample, pycnometer & immersion liquid 56.79 g 56.71 g Mass of immersion liquid added (m2) 12.47 g 12.76 g Calculated density of sample 1.977 g/cm³ 1.997 g/cm³ Density of Sample 1977 kg/m³ 1997 kg/m³ Mean Result 1987 kg/m³

Conclusions:
The relative density of the substance zirconium dinitrate oxide was determined to be 1.987 at 20°C.
Endpoint:
relative density
Type of information:
experimental study
weight of evidence
Study period:
17 October 2017
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
pycnometer method
Key result
Type:
relative density
Density:
2.302
Temp.:
20.1 °C
Remarks on result:
other: Mean value of two assays (assay No.1: 2.312 at 20.4°C, assay No.2: 2.291 at 19.7°C)

Assay No. 1

Test item sample weight (ME): 10.0400 g

Reference volume (VA):   79.444 cm³

Volume of sample cell holder (VC): 27.678 cm³

Temperature during the assay: 20.4°C

 Data P2 (PSIG) P3  (PSIG) Vp (cm³) Density (g/cm³) Relative density Mean relative density Run No. 4 17.059 3.873 4.3437 2.3114 2.3115 2.312 ± 0.002 Run No. 5 17.123 3.888 4.3400 2.3134 2.3134 Run No. 6 17.175 3.899 4.3463 2.3100 2.3101

The runs Nos. 1, 2 and 3 were not taken into account; they did not comply with the quality criteria.

Assay No. 2

Test item sample weight (ME): 10.0862 g

Reference volume (VA):   79.444 cm³

Volume of sample cell holder (VC): 27.678 cm³

Temperature during the assay: 19.7°C

 Data P2 (PSIG) P3  (PSIG) Vp (cm³) Density (g/cm³) Relative density Mean relative density Run No. 3 17.031 3.859 4.4033 2.2906 2.2907 2.291 ± 0.001 Run No. 4 17.097 3.874 4.4029 2.2908 2.2908 Run No. 5 17.140 3.884 4.4010 2.2918 2.2919

The runs Nos. 1 and 2 were not taken into account; they did not comply with the quality criteria.

Conclusions:
Based on the tests performed, the mean relative density of the test item was 2.302 ± 0.011 at 20.1°C.

### Description of key information

Based on a weight of evidence approach using two reliable (Klimisch) guideline studies (Younis, 2015a; Demangel, 2017), the relative density can be concluded to range from 1.987 to 2.302 at room temperature, depending on the Zr:nitrate ratio as specified in the Substance Identification Profile.