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Diss Factsheets

Physical & Chemical properties

Density

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Endpoint:
relative density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 17 June 2021 to 29 September 2021
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Demangel (2021).
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Demangel (2021).
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Demangel (2021).
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Demangel (2021).
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Demangel (2021).
Qualifier:
according to guideline
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Version / remarks:
Version: 2012
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
GLP certificate dated from 04 May 2021.
Type of method:
air comparison pycnometer (for solids)
Key result
Type:
relative density
Density:
6.803
Temp.:
20 °C
Remarks on result:
other: ± 0.004















































































 



Assay 1



Assay 2



Test item weight (g)



49.8110



47.3260



Measured density (g/cm3)



#1



6.8416



6.8468



#2



6.8202



6.8252



#3



6.8096



6.8087



#4



6.8065



6.7921



#5



6.7933



6.7980



#6



6.8049



6.7797



#7



6.8072



6.7907



#8



6.7930



6.7850



#9



6.7966



6.7829



#10



6.7932



6.7781



Mean density (g/cm3)



6.8066 ± 0.0144



6.7987 ± 0.0211



Relative density (no unit)



6.807



6.799



Mean relative density (no unit)



6.803 ± 0.004


Conclusions:
The relative density of cerium gadolinium oxide is equal to 6.803 ± 0.004.
Executive summary:

The relative density of cerium gadolinium oxide was investigated in a GLP-compliant study according to OECD TG 109 using the gas comparison pycnometer (DSC) method. The relative density was determined to be equal to 6.803 ± 0.004.

Endpoint:
density, other
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
From June 2021 to 13 October 2021
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Remarks:
The density was part of the information measured in the context of the study from Mathiak (2021) dedicated to assess the dustiness of the test substance. Therefore, determination of density was not the ultimate aim of this study, and no guideline was followed. However, the method used (i.e. air comparison pycnometry) was the same as the one used in the key study of Demangel (2021) and the results are pretty similar.
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Mathiak (2021).
Reason / purpose for cross-reference:
reference to same study
Remarks:
Other physico-chemical endpoints are covered in the study report of Mathiak (2021).
Qualifier:
no guideline followed
Principles of method if other than guideline:
Air comparison pycnometry.
GLP compliance:
no
Type of method:
air comparison pycnometer (for solids)
Type:
density
Density:
6.909 g/cm³
Temp.:
26.33 °C
Remarks on result:
other: ± 0.0057 g/cm3
































































Cycles of measurement



Volume (cm3)



Density (g/cm3)



#1



1.1845



6.9064



#2



1.1855



6.9009



#3



1.1830



6.9152



#4



1.1847



6.9053



#5



1.1825



6.9182



#6



1.1855



6.9005



#7



1.1833



6.9134



#8



1.1846



6.9059



#9



1.1834



6.9127



#10



1.1844



6.9070



Mean



1.1842 ± 0.0010



6.9085 ± 0.0057


Conclusions:
The density of cerium gadolinium oxide is equal to 6.9085 ± 0.0057 g/cm3.
Executive summary:

The density of cerium gadolinium oxide was determined as part of a non-GLP compliant study dealing with another endpoint. The gas comparison pycnometer (DSC) method was used, but no guideline was followed. The density was determined to be equal to 6.9085 ± 0.0057 g/cm3.

Description of key information

The relative density of cerium gadolinium oxide is equal to 6.803 ± 0.004.

Key value for chemical safety assessment

Relative density at 20C:
6.803

Additional information

An experimental study performed under GLP compliance and in accordance with OECD TG 109 was flagged as a key study and assigned a Klimisch score of 1. It reports that cerium gadolinium oxide has a relative density of 6.803 ± 0.004 (corresponding to a density of 6.8027 g/cm3). Another experimental study performed using the same experimental method (i.e. air comparison pycnometry), but not following a standard guideline and not GLP-compliant, was flagged as a supporting study and assigned a Klimisch score of 2. It reports a pretty similar density for cerium gadolinium oxide (6.9085 g/cm3).