Didysprosium trioxide

Density

Administrative data

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 June 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Reference

Endpoint:

appearance / physical state / colour

Type of information:

other: Visual inspection

Adequacy of study:

weight of evidence

Study period:

22 June 2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Information taken from a GLP-compliant study report on relative density in which the appearance and physical state of the test item was described based on visual inspection.

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline followed

Principles of method if other than guideline:

Visual inspection.

GLP compliance:

yes (incl. QA statement)

Physical state at 20°C and 1013 hPa:

solid

Form:

solid: particulate/powder

Colour:

(pale) yellow powder

Substance type:

inorganic

Conclusions:

Didysprosium trioxide is concluded to be a (pale) yellow powder under ambient conditions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

pycnometer method

Test material

Test material information

Constituent 1

Reference substance name:

Didysprosium trioxide

EC Number:

215-164-0

EC Name:

Didysprosium trioxide

Cas Number:

1308-87-8

Molecular formula:

Dy2O3

IUPAC Name:

dysprosium(3+); oxygen(2-)

Test material form:

solid: particulate/powder

Details on test material:

Name of the test material (as cited in the report): didysprosium trioxide
Physical state: solid
Appearance: (pale) yellow powder
Further information on test item confidential.

Results and discussion

Density

Key result

Type:

relative density

Density:

ca. 8.131

Temp.:

21.6 °C

Remarks on result:

other: Mean value of two assays (assay No.1: 8.061, assay No.2: 8.201)

Any other information on results incl. tables

Two independent measurements at 21.5°C (assay No. 1) and 21.7°C (assay No. 2) were done. Runs 1, 2 and 3 of assay No. 1 and runs 1, 2, 3 and 4 of assay No. 2 were not taken into account because they did not comply with the quality criterion.

The two assays resulted in relative densities of 8.061 ± 0.001 and 8.201 ± 0.008, respectively. The mean relative density was thus 8.131 ± 0.077 at 21.6°C.

Reference volume (Va) was 79.444 cm³.

Volume of sample cell holder (Vc) was 27.678 cm³.

Test item sample weight was 9.1456 g and 9.9039 g in assay No. 1 and 2, respectively.

The measurements are described in the table in the next section.

Applicant's summary and conclusion

Conclusions:

The relative density of didysprosium trioxide was determined according to EU A.3 method and OECD test guideline 109 in compliance with GLP using a gas comparison pycnometer. The relative density of the test item was determined to be 8.131 ± 0.077 at 21.6°C.