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Diss Factsheets
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EC number: 947-747-7 | CAS number: -
- 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
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
The structurally similar read across substance, erbium gadolinium yttrium zirconium oxide is practically insoluble in water. The substance is considered to be a suitable substitute for the registered substance since the only difference between the substance being registered and the read-across substance is that the substance to be registered is missing the gadolinium oxide content (about 1.4 %). The absence of this compound at such a low % is considered highly unlikely to affect its properties.
The water solubility of the read-across substance was determined according to the column elution method. During the study, zirconium was measured because it is the dominant element in the material. Of the other elements, only erbium was measured, because based on comparison of the relative presence of erbium, gadolinium and yttrium in the material, as well as comparison of the water solubility of their oxide forms, erbium was concluded to be the element that would likely be released the most (if any) from the substance when added to water. However, both zirconium and erbium concentrations were below the LOQ (< 0.001 mg/L) in all samples analysed. Therefore the substance can be considered as insoluble in water. Although insoluble, due to their extremely high affinity for phosphate, zirconium, yttrium and lanthanides from poorly soluble compounds (such as their respective oxides) have been observed to affect the dissolved phosphate concentration in algal test media to an extent that algae may suffer from phosphate deprivation, resulting in significant growth inhibition. The observed effects however did not suggest classification of the (insoluble and poorly soluble) zirconium, yttrium and lanthanide compounds tested so far. Further, no tests have been identified yet demonstrating that zirconium, yttrium or lanthanides have a direct toxic effect on algae or other aquatic plants. The phosphate depletion in the test media is a technical issue that - at this point in time - cannot be solved, since it would require the identification of a phosphate complexing agent with higher affinity for phosphate than zirconium, yttrium and lanthanides while not resulting in precipitation of the formed complex from the test medium. Such a complexing agent has not been identified yet. Therefore, and because it is highly unlikely that a phosphate deprivation effect would occur at an environmentally relevant scale (e.g. ecosystem level) due to a hypothetical release of (insoluble or poorly soluble) zirconium, yttrium or lanthanide compounds to the environment, further algal growth inhibition tests with the registered substance, are not expected to provide further insights and are therefore not considered necessary.
Reference
Description of key information
In accordance with Column 2 of REACH Annex VII, information requirement section 9.1.2, this study does not need to be conducted since the substance is highly insoluble in water and therefore aquatic toxicity is unlikely to occur.
Key value for chemical safety assessment
Additional information
The structurally similar read across substance, erbium gadolinium yttrium zirconium oxide is practically insoluble in water. The substance is considered to be a suitable substitute for the registered substance since the only difference between the substance being registered and the read-across substance is that the substance to be registered is missing the gadolinium oxide content (about 1.4 %). The absence of this compound at such a low % is considered highly unlikely to affect its properties.
The water solubility of the read-across substance was determined according to the column elution method. During the study, zirconium was measured because it is the dominant element in the material. Of the other elements, only erbium was measured, because based on comparison of the relative presence of erbium, gadolinium and yttrium in the material, as well as comparison of the water solubility of their oxide forms, erbium was concluded to be the element that would likely be released the most (if any) from the substance when added to water. However, both zirconium and erbium concentrations were below the LOQ (< 0.001 mg/L) in all samples analysed. Therefore the substance can be considered as insoluble in water. Although insoluble, due to their extremely high affinity for phosphate, zirconium, yttrium and lanthanides from poorly soluble compounds (such as their respective oxides) have been observed to affect the dissolved phosphate concentration in algal test media to an extent that algae may suffer from phosphate deprivation, resulting in significant growth inhibition. The observed effects however did not suggest classification of the (insoluble and poorly soluble) zirconium, yttrium and lanthanide compounds tested so far. Further, no tests have been identified yet demonstrating that zirconium, yttrium or lanthanides have a direct toxic effect on algae or other aquatic plants. The phosphate depletion in the test media is a technical issue that - at this point in time - cannot be solved, since it would require the identification of a phosphate complexing agent with higher affinity for phosphate than zirconium, yttrium and lanthanides while not resulting in precipitation of the formed complex from the test medium. Such a complexing agent has not been identified yet. Therefore, and because it is highly unlikely that a phosphate deprivation effect would occur at an environmentally relevant scale (e.g. ecosystem level) due to a hypothetical release of (insoluble or poorly soluble) zirconium, yttrium or lanthanide compounds to the environment, further algal growth inhibition tests with the registered substance, are not expected to provide further insights and are therefore not considered necessary.
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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