Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23 May 2016 - 31 August 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Related information:
Composition 1
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Key result
Decomposition:
yes
Decomp. temp.:
>= 275 - <= 325 °C
Remarks on result:
other: The test item loses its hydration water when heated (endothermic peaks at ca. 100 and 140°C). The test item did not melt over the temperature range tested. The endothermic peak observed from ca. 275°C to 325°C was interpreted as decomposition.

Assay No. 1 (heating ramp: 25°C to 600°C at 10°C/min):

Endothermic peaks were observed at 100.9°C and 142.2°C. These endothermic events reflected the fact that the test item loses its hydration water when heated.

The endothermic peak observed from about 275°C to 325°C may correspond to the decomposition of the anhydrous form with release of carbon oxide or carbon dioxide.

Assay No. 2 (heating ramp: 25°C to 600°C at 10°C/min):

The second assay was similar to the first one.

Endothermic peaks were observed at 99.2°C and 139.0°C. These endothermic events reflected the fact that the test item loses its hydration water when heated.

The endothermic peak observed from about 275°C to 325°C may correspond to the decomposition of the anhydrous form with release of carbon oxide or carbon dioxide.

Conclusions:
The melting behaviour of tris[oxalato(2-)]digadolinum was assessed according to EU A.1 method and OECD test guideline 102 in compliance with GLP using Differential Scanning Calorimetry (DSC). The test item did not melt over the temperature range tested (25°C to 600°C). The DSC curve revealed two endothermic peaks at about 100°C and 140°C which reflect the fact that the test item loses its hydration water when heated. The endothermic peak observed from about 275°C to 325°C may correspond to the decomposition of the test item.

Description of key information

In a GLP study (Klimisch 1, Demangel, 2016) performed according to the EU A.1 method and OECD test guideline 102 using Differential Scanning Calorimetry (DSC), gadolinium oxalate did not melt over the temperature range tested (25°C to 600°C). The DSC curve revealed endothermic peaks at about 100°C and 140°C which reflect the fact that the test item loses its hydration water when heated. The endothermic peak observed from about 275°C to 325°C may correspond to the decomposition of the test item.

This study was assigned as key study.

Key value for chemical safety assessment

Additional information