Registration Dossier
Registration Dossier
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EC number: 235-384-0 | CAS number: 12207-63-5
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2009-12-16
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- not specified
- Type of method:
- thermal analysis
- Remarks:
- DSC_TG
- Decomposition:
- yes
- Decomp. temp.:
- >= 315 - <= 690 °C
- Conclusions:
- According to the measured onset temperature, decomposition of the test substance started at 315 °C.
Reference
Two DSC-runs in alumina crucibles with a hole showed the following effects:
1. Endothermic effect due to the evaporation of H2O in the temperature range up to 120 °C (weight loss of approximately 39.61 wt-%).
2. Endothermic effect due to the decomposition of 2 NH4V3O8 to 2NH3(g)+ H2O(g) + 3V2O5(s) in the temperature range of 300 – 380 °C with an onset temperature of 315.2 °C and a weight loss of approximately 5.04 wt-%.
3. Endothermic effect due to the melting of V2O5 in the temperature range of approximately 640 – 690 °C with an onset temperature of 666.7 °C, which determines also the melting point of V2O5.
Description of key information
The decomposition of the ammonium trivanadium octaoxide starts at 315 °C.
Key value for chemical safety assessment
Additional information
In the study by Hochenhofer (2009), two DSC-runs in alumina crucibles with a hole showed the following effects: 1. Endothermic effect due to the evaporation of H2O in the temperature range up to 120 °C (weight loss of approximately 39.61 wt-%). 2. Endothermic effect due to the decomposition of 2 NH4V3O8 to 2NH3(g)+ H2O(g) + 3V2O5(s) in the temperature range of 300 – 380 °C with an onset temperature of 315.2 °C and a weight loss of approximately 5.04 wt-%. 3. Endothermic effect due to the melting of V2O5 in the temperature range of approximately 640 – 690 °C with an onset temperature of 666.7 °C, which determines also the melting point of V2O5. According to the measured onset temperature, decomposition of the test substance started at 315 °C.
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