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EC number: 456-900-2 | CAS number: 51285-81-5 GADOLINIUMSULFIT-TRIHYDRAT
- 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
Particle size distribution (Granulometry)
Administrative data
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- In a first step, the dispersion agent (ethanol) was added into the system and brought to constant circulation. Then, an underground determination and system calibration was carried out by measuring the particles contained in the dispersion agent. The resulting particle contamination was 0.00 %. Afterwards, some powder of Gd2(SO3)3 • 3 H2O was added into the ethanol at time t0 until an optimum intensity of the scattered light was achieved (Copt = 10.03 %). The first measurment was started at t1 = 4 min 8 s after t0. Recording of particle size data for the first measurement was carried out for 10 s. The measurements were then repeated in the same way at t2 = 19 min 42 s and t3 = 29 min 26 s after t0 without exchanging the suspension in between.
The calculation model used for determination of the particle size distribution assumes each particle to have spherical shape. Thus, the distribution curves calculated by the software of the system display the particle distribution vs. an averaging particle diameter. It is also important to point out that the distribution is volume based and does not refer to the number of particles. - GLP compliance:
- not specified
- Type of method:
- Laser scattering/diffraction
- Type of particle tested:
- aggregate
- Type of distribution:
- volumetric distribution
Test material
- Reference substance name:
- Gadoliniumsulfite trihydrate
- EC Number:
- 456-900-2
- EC Name:
- Gadoliniumsulfite trihydrate
- Cas Number:
- 51285-81-5
- Molecular formula:
- Gd2(SO3)3*3H2O
- IUPAC Name:
- digadolinium(3+) trihydrate trisulfite
- Test material form:
- solid: particulate/powder
- Details on test material:
- white dry powder
sample name: 2-02-M
Constituent 1
Results and discussion
- Mass median aerodynamic diameter:
- 93.6 µm
Particle sizeopen allclose all
- Key result
- Percentile:
- D99
- Mean:
- 178.47 µm
- St. dev.:
- 1.2
- Key result
- Percentile:
- D90
- Mean:
- 138.32 µm
- St. dev.:
- 1.45
- Key result
- Percentile:
- D50
- Mean:
- 93.57 µm
- St. dev.:
- 0.83
- Key result
- Percentile:
- D10
- Mean:
- 52.4 µm
- St. dev.:
- 0.48
Applicant's summary and conclusion
- Executive summary:
The measurement was carried out with the laser diffraction spectroscopy device Sympatec Helos KR equipped with three lenses R1, R3, and R5 for particle sizes in the range of 0.1 to 875 µm. The device fully agrees with ISO 13320 (“Particle size analysis - laser diffraction methods”). Data interpretation was carried out with the software WINDOX 5.7.1.0 provided by the equipment manufacturer Sympatec. In a first step, the dispersion agent (ethanol) was added into the system and brought to constant circulation. Then, an underground determination and system calibration was carried out by measuring the particles contained in the dispersion agent. The resulting particle contamination was 0.00 %. Afterwards, some powder of Gd2(SO3)3 • 3 H2O was added into the ethanol at time t0 until an optimum intensity of the scattered light was achieved (Copt = 10.03 %). The first measurment was started at t1 = 4 min 8 s after t0. Recording of particle size data for the first measurement was carried out for 10 s. The measurements were then repeated in the same way at t2 = 19 min 42 s and t3 = 29 min 26 s after t0 without exchanging the suspension in between. The calculation model used for determination of the particle size distribution assumes each particle to have spherical shape. Thus, the distribution curves calculated by the software of the system display the particle distribution vs. an averaging particle diameter. It is also important to point out that the distribution is volume based and does not refer to the number of particles. All measurements were carried out at room temperature (25°C). A density of 4.1 g / cm3 and an aspect ratio of 1.0 was used for particle size calculations.
Results:
• The powder of gadolinium sulphite trihydrate (Gd2(SO3)3 • 3 H2O) investigated by laser diffraction spectroscopy shows a monomodal particle size distribution.
• The spherical aggregates have sizes between 10-250 µm with 99 vol. % of the particles having sizes < 180 µm.
• The MMAD was calculated to 93.6(7) µm.
• The aggregates consist of platelike crystallites (< 10 µm).
• No significant volume of particles < 10 µm was detected.
• The powder particles have a low probability of fragmentation.
• The findings of the laser diffraction spectroscopy investigation are supported by SEM images of the same substance.
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