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Diss Factsheets
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EC number: 235-117-8 | CAS number: 12069-94-2
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Acute Toxicity: inhalation
Administrative data
- Endpoint:
- acute toxicity: inhalation
- Type of information:
- migrated information: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Study period:
- 2000-09-25 to 2001-03-20
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: GLP Guideline study. Niobium pentoxide used as read-across partner.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 001
- Report date:
- 2001
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 403 (Acute Inhalation Toxicity)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Test type:
- standard acute method
- Limit test:
- yes
Test material
- Reference substance name:
- niobium pentoxide
- IUPAC Name:
- niobium pentoxide
- Reference substance name:
- Diniobium pentaoxide
- EC Number:
- 215-213-6
- EC Name:
- Diniobium pentaoxide
- Cas Number:
- 1313-96-8
- Molecular formula:
- Nb2O5
- IUPAC Name:
- diniobium pentaoxide
- Test material form:
- solid: particulate/powder
- Remarks:
- migrated information: powder
- Details on test material:
- - Name of test material (as cited in study report): Nb205 Niobium Pentoxide Grade LN
- Physical state: white powder
- Analytical purity: 99.99%
- Purity test date: 2000-08-22
- Lot/batch No.: 20000103
- Expiration date of the lot/batch: 2001-03-31
- Storage condition of test material: in the dark at ambient room temperature and in the original container
Constituent 1
Constituent 2
Test animals
- Species:
- rat
- Strain:
- Sprague-Dawley
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Charles River UK Limited, Margate, Kent, England
- Age at study initiation: 8-9 weeks
- Weight at study initiation: males: 259 - 298 g, females: 204 - 237 g
- Housing: in groups of 5/sex in stainless steel cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 9 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.5 - 20.5
- Humidity (%): 39 - 68
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12 / 12
Administration / exposure
- Route of administration:
- inhalation: aerosol
- Type of inhalation exposure:
- nose only
- Vehicle:
- clean air
- Details on inhalation exposure:
- GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: snout-only exposure chambers were of cylindrical form (30 cm diamter, 45 cm height)
- Exposure chamber volume: 30 litres
- Method of holding animals in test chamber: animals were held for exposure in moulded polycarbonate restraining tubes, which were attached at evenly spaced ports in the cylindrical section of the chamber, and were designed to allow only the snout to project into the chamber
- Source and rate of air: a supply of clean, dry air was connected to the generator and the supply pressure was adjusted to give a flow rate of 15 litres/minute, measured at the generator outlet.
- Method of conditioning air: A neutralised diluent air supply, adjusted to give 10 litres/minute, was connected to the elutriator to provide a total air supply of 25 liters/minute. The neutralised air supply was also passed externally over the elutriator to aid the removal of any electrostatic charge. The test atmosphere was passed through a horizontal glass elutriator to reduce, by sedimentation, the amount of non-respirable particulate in the test atmosphere
- System of generating particulates/aerosols: a wright dust feed mechanism was used to produce the test atmosphere
- Method of particle size determination: two air samples were taken during the exposure at a sampling rate of 2 litres/minute using a Marple cascade impactor to determine particle size distribution. The samples were taken at 102 and 212 minutes into exposure- The volume of air sampled was measured using a wet-type gas meter. The amount of material collected on the stages of the sampler was determined gravimetrically. The particle size distribution of the test atmosphere was assessed using linear regression analysis
- Treatment of exhaust air: the exhaust airflow was calibrated and adjusted to produce a slightly negative pressure
- Temperature, humidity, air chamber: air temperature in the exposure chamber was measured using an alcohol-in-glass thermometer and the relative humidity was measured using a Casella type T6900 relative humidity meter. The temperature and relative humidity were recorded at the start of the exposure and then at 30 minutes intervals during the 4-hour exposure
TEST ATMOSPHERE
- Brief description of analytical method used: Seven samples of air were removed from the test chamber during exposure in order to determine the concentration of the test aerosol. Each air sample was withdrwam, at a rate of 2 litres/minute, through a pre-weighed glass fibre filter mounted in an open face filter holder. The volume of air sampled was measured using a wet-type gas meter. The filters were re-weighed following sampling for gravimetric analysis of the test aerosol
- Samples taken from breathing zone: no
TEST ATMOSPHERE (if not tabulated)
- MMAD: 3.3 µm, approximately 88% of the particulate were considered of respirable size (<7 µm in aerodynamic diameter) - Analytical verification of test atmosphere concentrations:
- yes
- Duration of exposure:
- 4 h
- Concentrations:
- Chamber concentration of Nb2O5:
The mean chamber concentration was 5.45 mg/L and was in good agreement with target (5 mg/L).
Nominal concentration
The nominal concentration was 26.1 mg/l. The mean chamber concentration was 20.9% of the nominal concentration and reflects losses of the test material due to impaction and deposition with the exposure system. When generating Niobium pentoxide static agglomeration was considered to be a significant factor in the particulate losses within the aerosol generation system. The use of a neutralized air supply, both to the WDF and diluents supply, was necessary to achieve the concentration attained. In addition, neutralized air was passed over the external surface of the elutriator to reduce electrostatic losses. The relatively low efficiency observed in this study is not unusual for the exposure system and test compound employed.
Particle size distribution
The mass median aerodynamic diameter (MMAD) of the test aerosol was 3.3m and was within the acceptable range (1m to 4 m) for an acute inhalation study. Approximately 88% of the particulate were considered of a respirable size (<7m in aerodynamic diameter). - No. of animals per sex per dose:
- 5
- Control animals:
- yes
- Details on study design:
- - Duration of observation period following administration: 14 days
- Frequency of observations:
Mortality: all cages were checked at least twice daily for dead or moribund animals
Clinical signs: animals were observed intermittently for signs of reaction during exposure and at least twice daily throughout the observation period
- Frequency of weighing: all animals were weighed at least twice during the week prior to exposure, prior to exposure (day 0), weekly during the observation period and on the day of death
- Terminal studies: at the end of the observation period the animals were killed by ip injection of pentabarbitone sodium followed by exanguination from the brachial blood vessels. All animals were subjected to detailed macroscopic examination. The lungs (including the larynx and trachea) were removed, dissected clear of surrounding tissue, weighed and the weights recorded. Lungs were discarded following necropsy.
- Other examinations performed: water consumption: a visual inspection of water bottles was conducted daily. - Statistics:
- N.A.
Results and discussion
- Preliminary study:
- not applicable
Effect levels
- Sex:
- male/female
- Dose descriptor:
- LC0
- Effect level:
- > 5 450 mg/m³ air
- Based on:
- test mat.
- Exp. duration:
- 4 h
- Mortality:
- There were no unscheduled deaths.
- Clinical signs:
- other: During exposure: Exaggerated breathing was observed in most test rats from 1 hour, and all test rats from 2 hours into exposure. Observation period: Exaggerated breathing was observed in all test rats immediately post exposure, persisting to day 4 of the
- Body weight:
- A slightly reduced mean bodyweight gain was evident for male test rats during the first week following exposure. Thereafter, the mean bodyweight gain was similar to that of the control values. Bodyweight gain values of the female test rats were similar to that of the control values.
- Gross pathology:
- There were no treatment-related findings noted at necropsy
- Other findings:
- - Organ weights: no effects seen on lung weights
- Water consumption: no treatment-related effects were observed
Applicant's summary and conclusion
- Interpretation of results:
- not classified
- Remarks:
- Migrated information Criteria used for interpretation of results: EU
- Conclusions:
- The LC0 (4-hour) for diniobium pentoxide is greater than 5.45 mg/L and therefore no classification is required according to CLP.
- Executive summary:
- In an acute inhalation toxicity study according to OECD Guideline 403, groups of young adult Sprague-Dawley rats (5/sex) were exposed via the inhalation route to niobium pentoxide (99.9% purity) as aerosol in air for 4 hours nose only at a concentration of 5.45 mg/L. Animals then were observed for 14 days. No death occurred. Exaggerated breathing was observed in most test animals from the 1st hour and in all test rats from the 2nd hour of exposure. Exaggerated breath persisted until day 4 post exposure. Based on the results a LC50 of greater than 5.45 mg/L can be considered for both sexes. Niobium pentoxide is not classified according to CLP. These results are used in a read-across approach in the assessment of niobium carbide.
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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