Registration Dossier
Registration Dossier
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EC number: 244-508-2 | CAS number: 21656-02-0
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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Melting / freezing pt.:
- °C
- Decomposition:
- yes
- Decomp. temp.:
- 210 °C
- Conclusions:
- Rhodium trihydroxide decomposed from approximately 210 °C with no definitive signs of melting below 450°C.
- Executive summary:
Walker and White (2011) is GLP compliant and follows OECD guideline 102. It is considered suitable for use as the key study for this endpoint.
Rhodium trihydroxide decomposed from approximately 210 °C with no definitive signs of melting below 450°C.
Reference
As a result of the low rate of enthalpy change during decomposition, the onset temperature can only be approximated. As the test item was supplied as the "hydrated oxide" and exhibited no change in appearance up to 200°C, it was concluded that the broad endotherms observed from approximately 40 to 210°C were most likely due to losses of water of crystallisation. Similar thermographic profiles were obtained using air and nitrogen atmospheres; this indicates that the observed decomposition is probably thermal and not oxidative.
Description of key information
Rhodium trihydroxide decomposed from approximately 210°C with no definitive signs of melting below 450°C.
Key value for chemical safety assessment
Additional information
Walker and White (2011) is GLP compliant and follows OECD guideline 102. It is considered suitable for use as the key study for this endpoint.
Rhodium trihydroxide decomposed from approximately 210°C with no definitive signs of melting below 450°C.
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