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EC number: 832-253-5 | CAS number: 12165-18-3
- 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
Oxidising properties
Administrative data
Link to relevant study record(s)
- Endpoint:
- oxidising solids
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 17 July 2012 - 21 January 2013
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)
- Deviations:
- yes
- Remarks:
- see below
- Principles of method if other than guideline:
- The electrical resistance of the ignition wire used was 3.9 Ω/m, which is a deviation from the electrical resistance of 6.0 ± 0.5 Ω/m specified in the Method O.1. However, the material (Nickel/Chromium), length (30 cm) and diameter (0.6 mm) of the wire met the method specifications. In addition, the appropriate combination of current and voltage was used to ensure that the electrical power dissipation in the wire (150 ± 7 W) also met the method specifications. Therefore, as the physical parameters of the wire and the power dissipation (i.e. the heat applied to the test) met the method specifications, the deviation from the electrical resistance of the wire had no effect on the test.
- GLP compliance:
- yes (incl. QA statement)
- Contact with:
- powdered cellulose
- Sample tested:
- reference: 3:7 mixture potassium bromate + cellulose
- Parameter:
- mean burning time
- Result:
- 98 s
- Remarks on result:
- other: The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.
- Sample tested:
- 4:1 sample-to-cellulose ratio
- Parameter:
- mean burning time
- Result:
- 374 s
- Remarks on result:
- other: The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished but the cone continued to glow red. Some grey charred remains were observed.
- Sample tested:
- 1:1 sample-to-cellulose ratio
- Parameter:
- mean burning time
- Result:
- 676 s
- Remarks on result:
- other: The cone ignited with a large yellow flame and grey smoke. The flame extinguished but the cone continued to glow red. Some grey charred residues remained.
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- Under the conditions of this study, the test material has been determined not to be an oxidising solid and requires no classification in accordance with EU criteria.
- Endpoint:
- oxidising solids
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Justification for type of information:
- Data available on the individual constituents of the substance were considered to conclude on the endpoint. For praseodymium(III,IV) oxide, an experimental study is available, which is used for read across. For zirconium dioxide no data are available on the endpoint, because there was no need for performing an experimental study (study waived, see further). The read across justification document is attached in IUCLID Section 13.
- Reason / purpose for cross-reference:
- read-across source
- Specific details on test material used for the study:
- Initially, this substance was considered as a reaction mass and named "reaction mass of praseodymium(III,IV) oxide and zirconium dioxide".
But after discussion with ECHA, it was stipulated that it is a substance and we had to change the name to "Dipraseodymium dizirconium heptaoxide".
So, in the different endpoints with studies, the sustance named "reaction mass of praseodymium(III,IV) oxide and zirconium dioxide" corresponds to the substance Dipraseodymium dizirconium heptaoxide. They are the same, the analytical dossier did not changed. - Parameter:
- other: based on read-across
- Remarks on result:
- other: The reaction mass of praseodymium(III,IV) oxide and zirconium dioxide is not considered to exhibit oxidising properties.
- Remarks:
- This conclusion is based on two types of information. First, the results of an experimental study performed with praseodymium(III,IV) oxide according to the UN O1 guideline demonstrated that praseodymium(III,IV) oxide has no oxidising properties. Second, zirconium dioxide is concluded not to exhibit oxidising properties either, based on the fact that it is a stable inorganic oxide with zirconium in its highest oxidation state (i.e. +IV) and is therefore not sensitive to oxygen release. This is confirmed by the release of energy when zirconium is oxidised (delta h298/0 (Zr to ZrO2) = -549 KJ/mol) and by the limited amount of hydrogen which is consumed by pure zirconium dioxide at high temperature (1200 K) (Barin, I., Knacke, O. Thermodynamic Properties of Inorganic Substances, Springer-Verlag, Berlin, Heidelberg, New York, 1973). Furthermore, experience in the day-to-day handling and use of the substance shows no oxidising potential. It should be noted that the redox properties of zirconium dioxide in the use of catalysts is due to the mobility of oxygen in the network of the catalytic material (Ramamoorthy, R., Sundararaman, S., Ramasamy, S. Solid state ionics, 123 (1999) p.271). An example being its use as a doping compound in oxygen storage materials used as catalysts in the automotive industry. Based on this information, the reaction mass of these two oxides can safely be concluded not to exhibit oxidising properties either.
Referenceopen allclose all
Table 1 Potassium Bromate and Cellulose Mixture (3:7 by Mass)
Test Number |
Burning Time (seconds) |
Observations |
1 |
94 |
The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue. |
2 |
91 |
The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue. |
3 |
110 |
The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue. |
4 |
102 |
The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue. |
5 |
95 |
The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue. |
Mean burning time = 98 seconds
Room temperature: 20 - 21 °C
Table 2 Test Material and Cellulose Mixture (4:1 by Mass)
Test Number |
Burning Time (seconds) |
Observations |
1 |
466 |
The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished after 145 seconds but the cone continued to glow red. Some grey charred remains were observed. |
2 |
361 |
The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished after 134 seconds but the cone continued to glow red. Some grey charred remains were observed. |
3 |
340 |
The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished after 134 seconds but the cone continued to glow red. Some grey charred remains were observed. |
4 |
383 |
The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished after 155 seconds but the cone continued to glow red. Some grey charred remains were observed. |
5 |
320 |
The cone ignited with a yellow flame, grey smoke and some sparks. The flame extinguished after 110 seconds but the cone continued to glow red. Some grey charred remains were observed. |
Mean burning time = 374 seconds
Room temperature: 19 °C
Table 3 Test Material and Cellulose Mixture (1:1 by Mass)
Test Number |
Burning Time (seconds) |
Observations |
1 |
565 |
The cone ignited with a large yellow flame and grey smoke. The flame extinguished after 278 seconds but the cone continued to glow red. Some grey charred residues remained. |
2 |
619 |
The cone ignited with a large yellow flame and grey smoke. The flame extinguished after 266 seconds but the cone continued to glow red. Some grey charred residues remained. |
3 |
622 |
The cone ignited with a large yellow flame and grey smoke. The flame extinguished after 246 seconds but the cone continued to glow red. Some grey charred residues remained. |
4 |
637 |
The cone ignited with a large yellow flame and grey smoke. The flame extinguished after 287 seconds but the cone continued to glow red. Some grey charred residues remained. |
5 |
936 |
The cone ignited with a large yellow flame and grey smoke. The flame extinguished after 257 seconds but the cone continued to glow red. Some grey charred residues remained. |
Mean burning time = 676 seconds
Room temperature: 19 °C
Discussion
The ignition wire broke during each of the tests for the mixtures of test material and cellulose. Breaking of the ignition wire often occurs with test material and cellulose mixtures but this is not the case for the reference mixtures. Test O.1 states that if the wire breaks during the test, then the test should be repeated unless the wire breaking clearly does not affect the result. In each case that the wire broke, it was judged not to have affected the test.
As the mean burning times for the mixtures of test material and cellulose were greater than the mean burning time for the 3:7 (by mass) mixture of potassium bromate and cellulose, it was not necessary to determine the mean burning times for the faster burning reference mixtures.
Description of key information
There is no experimental data available for the endpoint on oxidising properties for dipraseodymium dizirconium heptaoxide. However, based on a weight of evidence approach including information available for the individual constituents of the substance, it can be concluded that the substance dipraseodymium dizirconium heptaoxide does not exhibit oxidizing properties
Key value for chemical safety assessment
- Oxidising properties:
- non oxidising
Additional information
1. Information on praseodymium(III,IV) oxide
Under the conditions of a UN O.1 guideline study (White, 2013; Klimisch 1), praseodymium(III,IV) oxide has been determined not to be an oxidising solid and requires no classification in accordance with EU criteria.
2. Information on zirconium dioxide
Zirconium dioxide being a stable inorganic oxide with zirconium in its highest oxidation state (i.e. +IV), is not sensitive to oxygen release. Moreover, experience in the day-to-day handling and use of the substance also confirms that it does not exhibit any oxidising potential.
3. Conclusion on the substance dipraseodymium dizirconium heptaoxide
Since both oxides of the substance were demonstrated/concluded not to exhibit oxidising properties, it can be safely concluded that the substance of dipraseodymium dizirconium heptaoxide is not oxidising either.
Justification for classification or non-classification
Based on information available for its individual constituents, which do not exhibit oxidising properties, the substance dipraseodymium dizirconium heptaoxide was concluded not to exhibit oxidising properties either and therefore does not need to be classified under the CLP regulation.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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