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Diss Factsheets
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EC number: 233-802-6 | CAS number: 10361-93-0
- 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
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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:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The solid-liquid equilibria of H2O-Y(NO3)3 systems are studied using conductimetry and controlled thermal flux analysis. The solid phase was studied using X-ray diffraction, thermogravimetry and chemical analysis such as calcination and Inductively Coupled Plasma-Atomic Emission Spectrometry.
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- ca. 300 °C
- Remarks on result:
- other: The atmospheric pressure was not reported.
- Conclusions:
- When heating Y(NO3)3 hexahydrate, phase transitions are observed at 51.8°C, 77.8°C (pentahydrate) and 120.4°C (tetrahydrate), which best can be described as solubilisation of Y(NO3)3 in its hydration water. Above 300°C and up to 500°C further conversion to YONO3, Y4O3(NO3)3 and finally Y2O3 is observed.
Reference
The metastable melting point of the tetra-, penta- and hexahydrate was determined to be 120.4, 77.8 and 51.8°C, respectively. The phase transitions could probably best be described as solubilisation of Y(NO)3 in hydration water. Further release of water results in the anhydrous form at approximately 235°C.
Above 300°C and up to 500°C further conversion to YONO3, Y4O3(NO3)3 and finally Y2O3 is observed. As a result, yttrium trinitrate did not melt over the temperature range tested.
Description of key information
In a published study, decomposition of yttrium trinitrate was noted from a DSC scan to start from approximately 300°C (Bouchet et al., 1994). As a result, yttrium trinitrate did not melt over the temperature range tested.
Key value for chemical safety assessment
Additional information
A literature study was identified which has been assigned key study status for this endpoint (Bouchet et al., 1994; Klimisch 2). In this study, when heating Y(NO3)3 hexahydrate, phase transitions were observed at 51.8°C, 77.8°C (pentahydrate) and 120.4°C (tetrahydrate), which can best be described as solubilisation of Y(NO3)3 in its hydration water. Above 300°C and up to 500°C, conversion of Y(NO3)3 to YONO3, Y4O3(NO3)3 and finally Y2O3 is observed. Yttrium trinitrate is concluded to decompose starting from approximately 300°C. Yttrium trinitrate did not melt over the temperature range tested in this study.
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