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EC number: 915-048-6 | CAS number: -
- 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
Acute toxicity to aquatic invertebrates:
Up to now, the constituent dicerium trisulphide (and by analogy reaction mass of dicerium trisulphide and dilanthanum trisulphide) was considered as not harmful to aquatic invertebrates up to the solubility limit in the test water at the loading rate of 100 mg/L (Bazin 1997, 1994).
Based on the disseminated dossier of H2S, the following range of L/C50 values were obtained for aquatic invertebrates: 48h to 96h-L/EC50 = 0.022 to 1.07 mg/L. This means that ecotoxicity of H2S occurs at very low concentrations for aquatic invertebrates as well. However, in the available studies on dicerium trisulphide, no toxicity was observed. As it was hypothetised for fish, different methodologies of test solutions preparation could lead to different releases of H2S and thus to variation of toxicity; that could explain the fact that no toxicity has been observed under certain conditions.
Taking into account the new, unexpected data obtained on fish exposed to reaction mass of dicerium trisulphide and dilanthanum trisulphide, no conclusion will thus be drawn on acute toxicity to aquatic invertebrates.
Toxicity to aquatic plants:
A known phenomenon which occurs when performing algal growth inhibition tests with rare earth compounds is the complexation of rare earths with phosphate from the test medium. This complexation leads to phosphate depletion. As phosphate is an important nutrient to algae, some indirect adverse effects were observed on algae growth. Rare earth sulphides do not escape to this rule because such a phenomenon was demonstrated for dicerium trisulphide (Cerbelaud, 1997).
Indeed, this last study demonstrates that there is probably an interaction between phosphate and cerium, inducing the precipitation of phosphate during the test solution preparation (as cerium is in excess), and the precipitation of cerium when nutrient salts are added to the test medium (as phosphate is in excess). The possible interaction between the test substance and the test medium prevents for making any conclusion regarding the inhibitory effect of dicerium trisulphide on the algal growth. As the growth of algae is not possible without phosphate, the growth inhibition observed without complementation of the medium with nutrient salts may be explained by the very low level of phosphate in the test solutions. This hypothesis is confirmed by the fact that the addition of nutrient salts removes the inhibitory properties of dicerium trisulphide (Cerbelaud, 1997).
The new, unexpected data obtained on fish exposed to reaction mass of dicerium trisulphide and dilanthanum trisulphide reveals a potential implication of H2S in the observed toxicity. For algae, such an impact of H2S could not be excluded. However, it could not be possible to evaluate it because potentially masked by the indirect phenomenon above described; which would applied as well to the reaction mass.
Additional information
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