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EC number: 231-843-4 | CAS number: 7758-94-3
- 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
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Additional physico-chemical information
Administrative data
Link to relevant study record(s)
Description of key information
- autocatalysis of the oxidation of Fe(II) by ferric hydroxide
Additional information
- exhibit linear reaction kinetics at Fe(II) loadings less than ~50 μm (~3 mg/L);
- increase 100-fold with a unit increase in pH;
- decrease with increasing ionic strength of the aqueous medium;
- depend to some extent on the anions present in solution;
- increase 10-fold for a 15 °C increase in temperature;
- exhibit a linear dependence on the partial pressure of oxygen; and
- exhibit negative deviations from linear reaction kinetics at Fe(II) loadings greater than ~50 μm (~3 mg/L) due to the autocatalytic oxidation of Fe(II) on the ferric hydroxide precipitate.
- Skeaff JM (2004). Review of the Oxidation of Ferrous Ion in Aqueous Media. Work Performed for Arcelor (Luxembourg, Luxemburg), CEFIC (Brussels, Belgium), EUROFER (Brussels, Belgium), Rio Tinto plc. (London, SW1Y 4LD, U.K.). Rev 10; Aug 17 2004. Self-published CANMET-MMSL 04-035 (CR)/Contract No. 602866 Natural Resources Canada. August 2004. 34 p.
A review of the scientific literature reveals that the rates at which dissolved Fe(II) oxidises to Fe(III) and the Fe(OH)3 precipitate (Skeaff 2004):
Based on empirical data reported in the literature, calculated half-times for the oxidation Fe(II) under an atmosphere of air range from 79 hr at pH 6, 20.5°C and an ionic strength of 0.034 to 8 seconds at pH 8, 25 °C and an ionic strength of 0.009, which is close to that for the OECD TG 203 toxicity testing medium. The autocatalysis of the oxidation of Fe(II) by ferric hydroxide sets in at Fe(II) loadings greater than ~50 μm (~3 mg/L) and increases the reaction rate to levels greater than predicted by linear homogeneous reaction kinetics. Based on literature data and empirical reaction kinetics, it was calculated that, at pH 6 in the dilute 10x OECD TG 203 medium, the half-times are 11, 9 and 3.6 hr, respectively, for the oxidation of Fe(II) as 1, 10 and 100 mg/L loadings of FeSO4.
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