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EC number: 231-906-6 | CAS number: 7778-50-9
- 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:
- other: Modern study conducted under GLP to the appropriate guidelines.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 009
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
- Qualifier:
- according to guideline
- Guideline:
- other: DIN ISO 4497
- Principles of method if other than guideline:
- A dry sieve test according to DIN ISO 4497 will be performed to separate the bigger particles (>1 mm) from smaller particles and the particulate matter (<100 µm). The particulate matter will then be tested according to OECD 110 particle size distribution by laser diffraction.
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- Potassium dichromate
- EC Number:
- 231-906-6
- EC Name:
- Potassium dichromate
- Cas Number:
- 7778-50-9
- Molecular formula:
- K2Cr2O7
- IUPAC Name:
- sodium dichromate
- Details on test material:
- The test material was obtained from JSC Aktyubinsk Chromium Compounds Plant.
Constituent 1
Results and discussion
Particle size
- Percentile:
- D50
- Remarks on result:
- other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
Particle size distribution at different passagesopen allclose all
- No.:
- #1
- Size:
- > 1 mm
- Distribution:
- < 0.01 %
- No.:
- #2
- Size:
- > 0.1 - < 1 mm
- Distribution:
- 99.3 %
- No.:
- #3
- Size:
- < 100 µm
- Distribution:
- 0.5 %
- No.:
- #4
- Size:
- < 10 µm
- Distribution:
- 0.003 %
- No.:
- #5
- Size:
- < 1 µm
- Distribution:
- 0 %
Any other information on results incl. tables
The sample was sieved manually using two sieves with a mesh size of 1 mm and 100 µm, respectively. The three resulting fraction were quantified gravimetrically and are tabulated below.
Fraction no. |
Particle fraction |
Weight |
Amount in % of the test item |
1 |
Share bigger than 1 mm |
Not detectable |
<0.01% |
2 |
<1 mm but bigger than 100 µm |
99.03 g |
98.3% |
3 |
Particulate matter (<100 µm) |
1.4811 g |
1.5% |
Total |
|
|
99.8% |
The particulate matter was further evaluated using laser diffraction. The test item was dispersed in ethanol and measured by laser diffraction. For calculation of the particle size distribution, the Fraunhofer model was used.
Particle fraction |
Amount in % of dry sieve fraction 3 |
Particulate matter >100 µm |
65.49% |
Particulate matter (<100 µm) |
34.3% |
Particulate matter (<10 µm) |
0.21% |
Particulate matter (<1 µm) |
Not detectable |
This result (sum of mass bigger than 100 µm = 65.49%) is in contradiction with the dry sieve test. Therefore fraction 3 of the dry sieve test was investigated by microscopy and sieved again. The microscopic picture reveals particles which are bigger than 100 µm and which are rod shaped. Therefore the laser diffraction is verified.
A second dry sieve test was performed and no particles bigger than 100 µm. These particles must have passed the sieve although bigger than 100 µm due to their rod-shape.
Using this data, the share of fraction 3 of the original dry sieve test will be split and the share bigger than 100 µm added to fraction 2 of the first dry sieve test. The particle size distribution is therefore:
Particle fraction |
Method |
Amount in % of dry sieve fraction 3 |
Share bigger than 1 mm |
Dry sieve test |
<0.01% |
<1 mm but bigger than 100 µm |
Dry sieve test corrected by laser diffraction |
99.3% |
Particulate matter (<100 µm) |
Laser diffraction of dry sieve fraction 3 |
0.5% |
Particulate matter (<10 µm) |
Laser diffraction of dry sieve fraction 3 |
0.003% |
Particulate matter (<1 µm) |
Laser diffraction |
Not detectable |
Applicant's summary and conclusion
- Conclusions:
- The particle size distribution was found to be <0.01% particles bigger than 1 mm, 99.3% of particles <1 mm and >100µm, <0.5% of particulate matter (<100µm) and 0.003% of particulate matter (<10 µm).
- Executive summary:
The particle size distribution was determined using two test methods; a dry sieve test according to DIN ISO 4497 and a laser diffraction test of the particulate matter according to OECD 110. The particle size distribution was found to be <0.01% of particles bigger than 1 mm, 99.3% of particles <1 mm and >100µm, <0.5% of particulate matter (<100µm) and 0.003% of particulate matter (<10 µm).
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