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EC number: 215-158-8 | CAS number: 1308-14-1
- 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
Endpoint summary
Administrative data
Description of key information
Additional information
At pH 6.8 – 11.5 Chromium(III)hydroxide is insoluble. Therefore no hydrolysis takes place. At low pH < 6.8 Cr(III)hydroxide is hydrolysed very rapidly to soluble species Cr(OH)2+, CrOH2+ and Cr3+. At pH >11.5 hydroxo complexes are formed. The substance is not subject to biodegradation or bioaccumulation. Even bioconcentration factors for soluble chromium(III) compounds were low, between 86 and 192. Based on laboratory experiments the binding strength of Cr(III) to soil was rated by expert judgement. Binding of Cr(III) to soil above pH 4.5 in well-aerated sandy soils low humus content of < 2% of weak acidity and pH and redox potential is very strong. At lower pH the binding strength subsequently decreases to very weak at pH 2.5. Insoluble Chromium(III)hydroxide is formed in soils at pH >4.7. Formation of Chromium(III)hydroxide is forced, as the reaction consumes H+and reduces pH of soils. In soils precipitated Chromium(III)hydroxide is aged with time resulting in more crystalline forms with lowered solubility. There is strong evidence that organic bound Chromium(III) is very low. The exchangeable portion of Cr(III) is also negligible.
Cr(III) is removed very rapidly by precipitation as various Cr(III) species, e.g. as hydroxide and/or adsorption. Within 6 hours there is no Cr(III) detectable. Some of the Cr(III) is then oxidized by Mn(IV)-containing minerals within a few hours. Higher levels of carbon may block mineral sites (eg. MnO2) that oxidize Cr(III). Cr(VI) disappears from pore water at a very slow rate compared to the disappearance of Cr(III). Adsorption coefficients increase with increasing pH.
Adsorption coefficients were determined as follows: Kd = 298 — 14346 L/kg (o.c.: 1.92%, pH 4.70 - 6.69), 19716 — 55918 L/kg soil (o.c.: 0.11%, pH 6.03 - 6.69), and 330 — 23658 (o.c.: 3.75%, pH 3.63 - 6.16) for loam, loess and clay, repectively.
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