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Diss Factsheets
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EC number: 231-545-4 | CAS number: 7631-86-9
- 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
Other distribution data
Administrative data
- Endpoint:
- other distribution data
- Type of information:
- experimental study
- Adequacy of study:
- other information
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: other test material (silica particles with iron (II,III) oxide core)
Data source
Reference
- Reference Type:
- publication
- Title:
- Fate of Silica Nanoparticles in Simulated Primary Wastewater Treatment
- Author:
- Jarvie H et al.
- Year:
- 2 009
- Bibliographic source:
- Environmental Science and Technology, Vol. 43, No. 22, pp. 8622-8628
Materials and methods
Test guideline
- Qualifier:
- no guideline available
- GLP compliance:
- not specified
- Type of study:
- other: sewage treatment model
- Media:
- water - sewage sludge
Test material
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- Cas Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
Constituent 1
- Specific details on test material used for the study:
- silicon dioxide nanoparticles of ca. 56 nm diameter and narrow polydispersity, consisting of an iron (II,III) oxide core (Fe3O4) encapsulated in a silica (SiO2) shell, synthesized and characterized
in-house
Results and discussion
Any other information on results incl. tables
Unfunctionalized silica particles (with Fe2O3 core) were stable and did not settle in wastewater during typical time scales of transit through the sewerage network and during the primary wastewater treatment process. In contrast, Tween-coated silica nanoparticles readily undergo flocculation on the same time scales and are likely to be retained by primary sedimentation and pass along a different environmental pathway, via sewage sludge.
Applicant's summary and conclusion
- Conclusions:
- Modifying the surface functionality of silica nanoparticles may change their colloidal behavior and fate in wastewater. In sewage treatment plants, silica nanoparticles may not be removed by sedimentation and continue through the effluent stream or may undergo flocculation and be retained in sewage sludge.
- Executive summary:
Unfunctionalized silica particles (with Fe2O3 core) were stable and did not settle in wastewater during typical time scales of transit through the sewerage network and during the primary wastewater treatment process. In contrast, Tween-coated silica nanoparticles readily undergo flocculation on the same time scales and are likely to be retained by primary sedimentation and pass along a different environmental pathway, via sewage sludge.
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