Registration Dossier
Registration Dossier
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EC number: 234-361-2 | CAS number: 11118-57-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Marine water
- Hazard assessment conclusion:
- no data available: testing technically not feasible
STP
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (freshwater)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Sediment (marine water)
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Additional information
Toxicity testing of chromium (II) oxide cannot be performed as the substance is unstable and classified as pyrophoric. As chromium (II) oxide will be completely converted into the most stable stage of chromium (III), it may be more appropriate to consider possible effects of chromium (III) compounds with regard to the environment. Therefore as an example, studies on the toxicity of chromium (III) acetate as analogue substance were reported. As chromium (III) acetate is water soluble and dissociates in the aquatic environment, possible effects would mainly be attributed to the Cr3+ion. However, the studies showed no toxicity potential for the aquatic compartment, and it is not to be expected for sediment and soil either.
Trivalent chromium is the most stable oxidation state, and it is ubiquitous in the environment as part of the earth’s crust, with a tendency to form kinetically inert complexes. Generally the bioavailability of chromium (III) is low and is to large parts depending on the existing pH-regime. In aqueous solutions at environmental pH values the insoluble Cr(OH)3 is the prevailing form. Furthermore, due to precipitation and/or adsorption processes chromium (III) becomes part of the sediment and soil, respectively. Studies have shown that the low bioavailability of chromium (III) is furthermore restricted by physiology, as it is normally not possible for chromium (III) compounds to cross cell membranes (Römpp Online 2008).
Conclusion on classification
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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