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EC number: 208-167-3 | CAS number: 513-77-9
- 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
Nanomaterial Zeta potential
Administrative data
- Endpoint:
- nanomaterial Zeta potential
- 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:
- 2 022
- Report date:
- 2022
Materials and methods
- Details on methods and data evaluation:
- The zeta potential is a key indicator of the stability of colloidal dispersions. The magnitude of the
zeta potential indicates the degree of electrostatic repulsion between adjacent, similarly charged
particles in a dispersion. For molecules and particles that are small enough, a high zeta potential
will confer stability, i.e., the solution or dispersion will resist agglomeration and thus precipitation.
When the potential is small, attractive forces may exceed this repulsion and the dispersion may
break and precipitate. Colloids with high zeta potential (negative or positive) are electrically
stabilized while colloids with low zeta potentials tend to coagulate or flocculate
Test material
- Reference substance name:
- Barium carbonate
- EC Number:
- 208-167-3
- EC Name:
- Barium carbonate
- Cas Number:
- 513-77-9
- Molecular formula:
- BaCO3
- IUPAC Name:
- barium carbonate
- Test material form:
- solid: nanoform
Constituent 1
Data gathering
- Instruments:
- ZetaSizer Nano ZS (Malvern, UK)
Results and discussion
Zeta potentialopen allclose all
- Zeta potential:
- -1.45 mV
- pH:
- 2
- Zeta potential:
- -3.48 mV
- pH:
- 3
- Zeta potential:
- -8.09 mV
- pH:
- 4
- Zeta potential:
- -9.1 mV
- pH:
- 5
- Zeta potential:
- -12.6 mV
- pH:
- 6
- Zeta potential:
- -14.53 mV
- pH:
- 7
- Zeta potential:
- -16.73 mV
- pH:
- 8
- Zeta potential:
- -20.2 mV
- pH:
- 9
- Zeta potential:
- -22.23 mV
- pH:
- 10
- Zeta potential:
- -25.27 mV
- pH:
- 11
- Zeta potential:
- -38.27 mV
- pH:
- 12.2
Any other information on results incl. tables
The dispersion that visually appeared slighty white in alkaline conditions turned to completely clear while decreasing the pH from pH 7 to pH6, suggesting a dissolution of the material at acidic pH. Based on these results, pH10, pH11 and pH12 were selected to test the stability of the dispersion.
Applicant's summary and conclusion
- Conclusions:
- The Zeta potential ranged from -1.45 to -38.3 mV in a NaOH solution at pH = 2.0 to 12.2.
- Executive summary:
The zeta potential was determined in a non-GLP compliant study using a Malvern ZetaSizer Nano. For this measurement, the powdered sample was dissolved in a 10E-2 M NOH solution (pH 12.2) which was brought step by step from pH 11 to 2. At each step the zeta-potential of the dispersion was measured.
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