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EC number: 940-441-4 | CAS number: -
- 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
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Initially slightly soluble, but hydrolytically unstable; limit of the ferric iron kation solubility in the order of ng Fe(III)/L
Key value for chemical safety assessment
Additional information
- OECD Organisation for Economic Co-operation and Development (2007). SIDS Initial Assessment Report for SIAM 24. Chemical Category: Iron Salts. Self-published, Paris, France, 17-20 April. 138 p.
Testing for this endpoint has been waived in accordance with column 2 restrictions. All soluble iron salts dissociate in aqueous media to the respective anions and kations, and are then subject to further change of oxidation and speciated state according to the conditions. Thus the salt is not stable and undergoes fast hydrolysis (DT50 < 12 h) in water at pH in the common environmental ranges.
Ferric and Ferrous kations
However initially a ferric salt, redox processes occur naturally and cause equilibrium of ferrous and ferric kations depending on the conditions. In presence of oxygen ferrous kations are readily oxidized to ferric kations, which are thus more important for the environmental assessment of aerobic waters.
The following Table below shows the maximum dissolved concentration of the iron kations in pure water as it depends upon pH (see section on Hydrolysis).
Table: Calculated maximum solubility of iron in solution at 20 °C depending on pH (OECD 2007, table 13, p 33)
pH |
Ferrous kation; iron (II) |
Ferric kation; iron (III) |
||
[mg Fe/L] |
[mmol Fe/L] |
[mg Fe/L] |
[mmol Fe/L] |
|
4 |
>1E+06 |
>1.8E+04 |
6.16E-02 |
1.1E-03 |
5 |
>1E+06 |
>1.8E+04 |
6.16E-05 |
1.1E-06 |
6 |
>1E+06 |
>1.8E+04 |
6.16E-08 |
1.1E-09 |
7 |
89'600 |
1'600 |
6.16E-11 |
1.1E-12 |
8 |
896 |
16 |
6.16E-14 |
1.1E-15 |
In conclusion the limit of the ferric iron kation solubility is even at significantly acidified conditions in the order of ng Fe(III)/L
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