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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
- 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
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- migrated information: read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Study period:
- 26 Oct. 1998 - 30 Oct. 1998
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: GLP guideline study - but read-across
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 998
- Report date:
- 1998
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- Version / remarks:
- version 07 June 1984
- GLP compliance:
- yes
Test material
- Reference substance name:
- Automatically generated during migration to IUCLID 6, no data available
- IUPAC Name:
- Automatically generated during migration to IUCLID 6, no data available
- Details on test material:
- other Test Substance:
SIPERNAT 820A, sodium aluminium silicate (Degussa) [CAS No. 1344-00-9]
Constituent 1
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material (migrated information):
PHYSICO-CHEMICAL PROPERTIES
- Melting point: ca. 1700 °C
- Boiling point: not relevant
- Vapour pressure: practically 0 Pa
- Water solubility (under test conditions): 48 mg/L (Sum of SiO2, Al, Na)
- Henry's law constant: not applicable
- log Pow: not applicable
- pKa: no data
- Stability in water: stable
- Stability in light: stable
- pH dependance on stability:
OTHER PROPERTIES (if relevant for this endpoint)
- Results of test for ready biodegradability: not applicable
Sampling and analysis
- Analytical monitoring:
- no
Test solutions
- Vehicle:
- no
- Details on test solutions:
- PREPARATION AND APPLICATION OF TEST SOLUTION (especially for difficult test substances)
- Method: stirring the suspensions for 24 h in 0.5 l ultrapure water, followed by filtration through paper filter.
- Eluate: Water extracts from 6250, 630, and 60 mg silicate/0.5 L, diluted to the target concentration
by additions of stock solutions needed for testing.
- Differential loading: yes
- Controls: without or with respective filtrates, but without algae
- Chemical name of vehicle (organic solvent, emulsifier or dispersant): none
- Evidence of undissolved material (e.g. precipitate, surface film, etc): not specified
Test organisms
- Test organisms (species):
- Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
- Details on test organisms:
- TEST ORGANISM
- Common name: green alga
- Strain: CHODAT
- Source (laboratory, culture collection): Pflanzenphysiol. Inst. University of Göttingen/Germany
- Age of inoculum (at test initiation): see below
- Method of cultivation: preculture 3 days prepared before test from a stock culture
Study design
- Test type:
- static
- Water media type:
- freshwater
- Limit test:
- yes
- Total exposure duration:
- 72 h
- Post exposure observation period:
- none
Test conditions
- Hardness:
- not specified
- Test temperature:
- 24.9 +-0.3°C
- pH:
- Initial pH: 8.00 (control); between 8.12 and 8.58 (tests)
final pH: 10.74 - 10.76 - Dissolved oxygen:
- -
- Salinity:
- not applicable
- Nominal and measured concentrations:
- 96, 1008, and 10,000 mg/L nominal
- Details on test conditions:
- TEST SYSTEM
- Test vessel:
- Type: open
- Material, size, headspace, fill volume: 50 ml glass cylinders
- Aeration:
- Renewal rate of test solution (frequency/flow rate): none
- Initial cells density: approx. 8 x10^4/ml
- Control end cells density: 2.83 x10^6/ml
- No. of vessels per concentration (replicates): 5
- No. of vessels per control (replicates): 7 (algal growth control), 3 (TS controls without algae)
GROWTH MEDIUM
- Standard medium used: yes
TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: synthetic medium from ultrapure water
- Total organic carbon: no data
- Alkalinity: not specified
- Ca/Mg ratio: not specified
- Conductivity: not specified
OTHER TEST CONDITIONS
- Sterile test conditions: yes
- Adjustment of pH: no
- Photoperiod: continuous
- Light intensity and quality: approx. 8000 lux [>= 120 µE/(m2*sec)]
EFFECT PARAMETERS MEASURED (with observation intervals if applicable) :
- Determination of cell concentrations: spectrophotometer at 578 nm after 24, 48, and 72 h
TEST CONCENTRATIONS
- Spacing factor for test concentrations: 10 - Reference substance (positive control):
- not specified
Results and discussion
Effect concentrationsopen allclose all
- Duration:
- 72 h
- Dose descriptor:
- NOELR
- Effect conc.:
- 10 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- other: biomass and growth rate
- Remarks on result:
- other: NOELR = No-observed effective loading rate
- Duration:
- 72 h
- Dose descriptor:
- EL50
- Effect conc.:
- > 10 000 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Basis for effect:
- other: biomass and growth rate
- Details on results:
- - Exponential growth in the control (for algal test): yes,
After 72 h, an increase in biomass (cell numbers) at a factor of >30 was achieved at any concentration.
- Observation of abnormalities (for algal test): no particular findings specified
- Any stimulation of growth found in any treatment: slight stimulation rather than inhibition observed - Results with reference substance (positive control):
- not applicable
- Reported statistics and error estimates:
- not applicable
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Conclusions:
- Under the test conditions, the test substance exhibited no acute and chronic toxic effect towards the test system (Scenedesmus subspicatus CHODAT).
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