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EC number: 237-358-4 | CAS number: 13762-14-6
- 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
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
LC50 (48h) = 211 mg cobalt molybdenum oxide/L (Chironomus tentans) (read-across from cobalt chloride hexahydrate)
Key value for chemical safety assessment
Additional information
No data on sediment toxicity are available for cobalt molybdenum oxide. However, there are reliable data available for different structurally analogue substances.
The environmental fate pathways and ecotoxicity effects assessments for cobalt metal and cobalt compounds as well as for molybdenum metal and molybdenum compounds is based on the observation that adverse effects to aquatic, soil- and sediment-dwelling organisms are a consequence of exposure to the bioavailable ion, released by the parent compound. The result of this assumption is that the ecotoxicology will be similar for all soluble cobalt and molybdenum substances used in the ecotoxicity tests. Therefore, data from soluble cobalt and molybdenum substances are used in the derivation of ecotoxicological and environmental fate endpoints, based on the cobalt ion and molybdenum ion, respectively.
Cobalt
Data on single-species toxicity tests resulting in high quality L(E)C50 values (expressed as Co) for sediment-dwelling species (n=5) are summarised in the WHO CICAD, 2006 (see attached table).Data on five species were available for the assessment. In the key study, Chironomus tentans was tested according to APHA guidelines (Standard methods for the examination of water and waste water, 1981) in a static 48-hour test, with cobalt chloride hexahydrate as test substance (Khangarot and Ray, 1989). As a result, a LC50 value of 57 mg Co/L was obtained, equivalent to 211 mg cobalt molybdenum oxide/L. For further species (Branchiura sowerbyi, Tubifex tubifex and Lumbriculus variegatus) 96 -hour LC50 values ranged from >45 to 239 mg Co/L, resulting in recalculated values of 167 to 888 mg cobalt molybdenum oxide/L. The results represent worst-case conditions since the solution will naturally contain more cobalt than would be available in a sediment matrix. The most sensitive value, however not conducted on a standard species, was derived from tests with the mayfly Ephemerella subvaria, resulting in a 96-hour LC50 of 18 mg/L (WHO CICAD, 2006).
References: World Health Organization (2006). Concise International Chemical Assessment Document 69. COBALT AND INORGANIC COBALT COMPOUNDS.
Molybdenum
One study is available on a short-term toxicity test with Chironomus tentans according to ASTM and US EPA guidelines (GEI, 2009). The test was conducted with sodium molybdate dihydrate and resulted in a 48 -hour LC50 of 7533 mg Mo/L.
Conclusion
As
the effect values derived from analogue cobalt compounds are
considerably lower than those derived from analogue molybdenum
substances, it can be reasoned that the cobalt ion will account for the
effects in ecotoxicological testing. Hence, it was concluded to put
forward the most sensitive and reliable results derived from analogue
cobalt compounds for assessment purposes, and recalculate them for
CoMoO4.
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