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EC number: 231-970-5 | CAS number: 7782-91-4
- 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
Long-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
Relevant fish studies were identified for the freshwater environment, and using bounded and most relevant endpoints/end parameters, species-specific NOECs could be determined for the fathead minnow Pimephales promelas and the rainbow trout Oncorhynchus mykiss. Test results were obtained in experiments that followed international accepted guidance, and were based on measured levels of dissolved molybdenum. For P. promelas and O. mykiss a NOEC of 60.2 mg/L and 43.2 mg/L, respectively.
For marine environment, a reliable 28d-EC10 of 84.1 mg Mo/L has been reported for the sheepshead minnow Cyprinodon variegatus.
Key value for chemical safety assessment
Additional information
Freshwater compartment
No reliable NOEC-values could be identified for the goldfish Carassius auratus (Birge, 1978). Therefore this species is not taken into account in the effects assessment of molybdenum for the aquatic compartment.
Four studies have been identified that report chronic effect levels for the rainbow trout Oncorhynchus mykiss. Two of these studies (Davies et al, 2005 ; Parametrix, 2008) produced high-quality effects data (K1-data). The first study reported NOEC-values for survival as effect parameter, whereas the second study presented NOEC- and EC10-values for survival and biomass growth. Comparable effect levels (NOECs) were found for survival in both studies. Biomass growth, however, was found to be a more sensitive effect parameter than survival. EC10-values were available based on a single test and on the combined effect-concentration relationship of two tests. Arguments can be put forward why a specific test result should be preferred over the other value. On one hand, combining two tests implies mixing the outcome of test results that were obtained with to different batches of organisms. The normalised effect-concentration relationship, however, shows a clear decrease from 0% effect to >95% effect. Consequently, the confidence interval that is associated with the combined data set is also narrower than the confidence interval around the EC10 of the second test, as only small but significant effects (10-22%) were observed at the two highest effect levels.
For the fathead minnow Pimephales promelas two reliable studies were identified: Canton et al (2006) and Parametrix (2007). K1-values were available for three endpoints, with (biomass) growth being more sensitive than survival in both studies. As EC10-values are preferred over NOEC-values for risk assessment purposes, the geometric mean of 60.2 mg Mo/L (EC10-values of 39.9 and 90.9 mg Mo/L) was selected as chronic no-effect value for P. promelas.
Marine compartment
Two reliable studies have been identified for the marine environment, and these for the sheepshead minnow Cyprinodon variegatus (Parametrix, 2009) and Menidia beryllina (Dinehart, 2013).
For the Menidia beryllina, reliable (K1) 37d-NOEC values (28d post-hatch) were derived for standard length and blotted weight. The 37d-NOEC for these endpoints was 139 mg Mo/L.
For the Cyprinodon variegatus, dry weight was the most sensitive endpoint (other endpoints: embryo/larval survival, biomass). For this endpoint a reliable 28d-EC10 of 84.1 mg Mo/L has been reported.
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