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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 17 may 2012 to 19 June 2012
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
according to
OECD Guideline 102 (Melting point / Melting Range)
according to
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Decomp. temp.:
214 °C

Three endothermic peaks were observed at 214-245°C, 240-270 °C and 270-335°C.

The test item was shown to not melt up to 400°C, as after reaching this temperature the residue was still a powder, i.e. it had not fused. Although it was concluded that the test item decomposed, the exact onset could not be accurately determined.

The residue of the test item after being heated to 220°C was an orange solid (similar to initial appearance) and gave no visual evidence of decomposition. However, on heating above 270 °C, the residue of the test item had changed in color from orange to pale green. Also at 320°C and 400°C the residue was observed to be a pale green colored solid.

Therefore, it was concluded that the endothermic events occurring from 214 to 335°C were due to decomposition.

The test item has been determined to decompose starting from 214°C.

Description of key information

In a GLP study in accordance with EC test method A.1 and OECD Guideline 102 following Differential Scanning Calorimetry, cerium ammonium nitrate was observed to decompose starting from approx 214°C (Walker, 2012).

Key value for chemical safety assessment

Additional information

No melting was observed up to the maximum test temperature (400°C), the temperature at which the residue was observed to have transformed into a pale green coloured solid.