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Diss Factsheets
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EC number: 233-038-3 | CAS number: 10025-73-7
- 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
Chromium trichloride in its anhydrous form is a crystalline violet solid, whereas the hexahydrate form is described as dark green if solid. However, in dilute aqueous solutions also the hexahydrate is violet. No odour is reported for the two forms.
Whereas chromium trichloride in anhydrous form melts at approx. 1150 °C, the hexahydrate form of chromium trichloride melts at 83 °C (presumably under loss of crystal water, which boils off leaving the anhydrous form behind at higher temperatures). In public literature no boiling point is reported but a sublimation temperature of 1300 °C of the anhydrous form.
The relative density of chromium trichloride, anhydrous is reported in two reliable peer-reviewed handbooks as 2.76 at 15 °C and 2.86 at 25 °C, respectively. The average value of 2.8 at 20 °C is sufficient for risk and hazard characterisation and is taken forward accordingly. It is noteworthy that the relative density of chromium trichloride hexahydrate in crystalline form is much lower (1.76 at 20 °C) as described in the CRC Handbook.
The test substance is provided to the EU market exclusively as an aqueous solution (typically 50%) and would have to be dried to obtain the solid test substance for testing. Because of this, application of granulometry testing on the solid test substance is not feasible as the characteristics measured would only be relevant to the material obtained specifically during the drying and grinding process described above and would not be applicable to a generic assessment of the test substance. Thus, granulometry data are not required and available.
Being an inorganic crystalline substance chromium trichloride and its hexahydrate have a negligible vapour pressure at ambient conditions. For hazard and risk assessment a worst case value of 0.001 Pa at 20 °C will be used.
Chromium trichloride in its hexahydrate form is very soluble in water (585 g/L at 25 °C) as reported within the CRC Handbook. It is typically marketed within Europe as a 50% aqueous solution in line with this information. The anhydrous form of chromium trichloride is reported being insoluble in cold water and slightly soluble in hot water. However, once in solution and converted to its hexahydrate form, solutions are stable. Significant effects on surface tension are not expected.
Chromium trichloride is not flammable, explosive or oxidising. However, chromium trichloride hexahydrate in aqueous solution was shown to be corrosive to aluminium and steel.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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