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EC number: 233-796-5 | CAS number: 10361-80-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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:
- From 2012-02-23 to 2012-03-28
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- other: Differential Scanning Calorimetry
- Key result
- Remarks on result:
- not determinable
- Remarks:
- The substance did not show melting behavior over the temperature range tested. The substance changed into a white solid which is concluded to correspond to anhydrous praseodymium trinitrate.
- Conclusions:
- The DSC curve revealed an endothermic peak at 83.2°C ± 0.5°C. This endothermic event reflected the fact that the rare earth salt solubilised in its hydration water. As a result, praseodymium trinitrate did not melt over the temperature range tested. The substance changed into a white solid which is concluded to correspond to anhydrous praseodymium trinitrate.
Reference
Assay No. 1:
Neither endothermic peak nor exothermic peak was recorded.
Assay No. 2:
An endothermic peak was observed at 88.2°C. This endothermic event reflected the fact that the rare earth salt solubilised in its hydration water. The hydrated rare earth salts, such as the hydrated form of praseodymium trinitrate, loose their water of hydration when heated. As these water molecules are loosely bound and as the amount of water in the substance is significant, the attached water is released and as a result the rare earth salt solubilizes in water. It is thus concluded that praseodymium trinitrate did not melt over the temperature range tested.
Assay No. 5:
An endothermic peak was observed at 85.5°C. As for the second preliminary assay, this revealed the solubilisation of the rare earth salt in its hydration water.
Assay No. 6:
A second endothermic peak was observed at 83.4°C. As for the previous assays, this revealed the solubilisation of the rare earth salt in its hydration water.
Assay No. 7:
An endothermic peak was observed at 82.9°C. As for previous assays, this revealed the solubilisation of the rare earth salt in its hydration water.
The assay No. 5 was not taken into account in the calculation of the endothermic peak value as it was not in compliance with the criterion (i.e. out of the range of the estimated accuracy of the method: no more than 0.5°C of variation between two assays up to 326.9°C).
The mean value of the endothermic peak was thus calculated from assays No. 6 and 7 (i.e. 83.2°C). This endothermic peak was in all cases preceded by a small endothermic peak at approx 60°C.
A complementary test with a Köfler bench was performed to better understand this phenomenon. From about 50 to 85 -90°C, the appearance of praseodymium trinitrate did not change. Then the salt solubilised in its hydration water and turned into a white solid at about 135 -140°C. It appeared this could not reflect the decomposition into praseodymium oxide as the oxide is a dark solid whose formation occurs at higher temperatures. Instead, the white solid observed during the Köfler bench assay should correspond to anhydrous praseodymium trinitrate.
Description of key information
A GLP melting point study with praseodymium trinitrate was conducted according to EU method A.1 and OECD Guideline 102 by Differential Scanning Calorimetry (Demangel, 2012). Praseodymium trinitrate does not melt below 600°C.
Key value for chemical safety assessment
Additional information
The DSC curve revealed an endothermic peak at 83.2°C ± 0.5°C. This endothermic event reflected the fact that the rare earth salt solubilised in its hydration water. As a result, praseodymium trinitrate did not melt over the temperature range tested. The substance changed into a white solid which is concluded to correspond to anhydrous praseodymium trinitrate.
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