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EC number: 233-059-8 | CAS number: 10026-12-7
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
This study covers the quantitative determination of dissolved niobium as hydrolysis/transformation product of the test item by ICP-MS in non-buffered water, buffered solutions (pH 4, 7, and 9) and aqueous solutions after pH adjustment (pH 4, 7, and 9). The test item showed a rapid hydrolysis in contact with water and a strong temperature rise during the addition of water was observed due to the exothermic reaction. The resulting turbid solution was strongly acidic (pH-value < 1) and contained an insoluble residue. The concentration of dissolved niobium at the solubility limit upon mixing NbCl5 with water in a non-buffered system, determined in triplicates at nominal loading rates of 9.1 - 14.0 g/L varied between 1.3 - 2.3 g Nb/L (hypothetically corresponding to 3.74 - 6.79 g NbCl5/L), demonstrating an average recovery of 43.6 ± 4.3 % (relative to loading). The mean recovery values (triplicates each, given together with their standard deviation) of dissolved niobium in buffered solutions was found to be 90.6 ± 0.3 % in citrate buffer (at pH 4), 1.5 ± 1.2 % in phosphate buffer (at pH 7), and 0.02 ± 0.02 % in borate buffer (at pH 9). The mean recovery values of dissolved niobium in water after pH-adjustment to the pH-values 4 and 9 (triplicates each) was found to be < 0.1 % relative to the applied loading. The calculated average recovery of dissolved niobium (triplicates, given together with its standard deviation) in water after pH-adjustment to pH-value 7 was found to be 1.2 ± 1.2 % relative to the applied loading.
Key value for chemical safety assessment
Additional information
A validated method, developed in the context of this study, was used for the quantitative determination of dissolved niobium as hydrolysis/transformation product of the test item by ICP-MS in non-buffered water, buffered solutions (pH 4, 7, and 9) and aqueous solutions after pH adjustment (pH 4, 7, and 9). The test item showed a rapid hydrolysis in contact with water and a strong temperature rise during the addition of water was observed due to the exothermic reaction. The resulting turbid solution was strongly acidic (pH-value < 1) and contained an insoluble residue. The concentration of dissolved niobium at the solubility limit upon mixing NbCl5 with water in a non-buffered system, determined in triplicates at nominal loading rates of 9.1 - 14.0 g/L varied between 1.3 - 2.3 g Nb/L (hypothetically corresponding to 3.74 - 6.79 g NbCl5/L), demonstrating an average recovery of 43.6 ± 4.3 % (relative to loading). Whereas the solutions after addition of water became strongly acidic (pH-value < 1), the buffer capacity was sufficient to maintain the desired pH-value when samples were prepared in buffered solutions. In both procedures, insoluble residues occurred which in some cases showed a slightly turbid filtrate even after membrane filtration of supernatants using filters with pore size 0.45 µm. The mean recovery values (triplicates each, given together with their standard deviation) of dissolved niobium in buffered solutions was found to be 90.6 ± 0.3 % in citrate buffer (at pH 4), 1.5 ± 1.2 % in phosphate buffer (at pH 7), and 0.02 ± 0.02 % in borate buffer (at pH 9). The Nb concentrations in water after pH-adjustment to equivalent pH-values differed considerably from those in buffer. The mean recovery values of dissolved niobium in water after pH-adjustment to the pH-values 4 and 9 (triplicates each) was found to be < 0.1 % relative to the applied loading. The calculated average recovery of dissolved niobium (triplicates, given together with its standard deviation) in water after pH-adjustment to pH-value 7 was found to be 1.2 ± 1.2 % relative to the applied loading.
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