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Diss Factsheets
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EC number: 930-930-0 | 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
Additional information
The acute aquatic toxicity of “reaction mass of calcium dihydroxide and calcium peroxide” has been investigated in a few valid assays. The experimental concentrations in those studies were based on the initial loading rates to which the test organisms were exposed. Studies on fish Cyprinus carpio using the reaction mass showed no toxicity at 100 mg/L (i.e. 96h-LL50 > 100 mg/L). The48h-EL50 forDaphnia magnaexposed to the reaction mass was 8.7 mg/L. For algae, the 72h-ErL50 and NOELr for growth rate inhibition (72h-ErL50) was determined to be 36 mg/L and 1 mg/L, respectively. The results showed that fish is less sensitive to the reaction mass than Daphnia and algae. No experimental study on the chronic toxicity of the reaction mass to Daphnia is available. However, the information can be derived from test data available for the primary hydrolysis product of the reaction mass “hydrogen peroxide”. As evidenced in a water solubility study, the reaction mass goes into the chemical reactions below in water rapidly (i.e. wihing 24 hours) and hydrogen peroxide subsequently occurred.
- CaO2 + 2 H2O -> Ca2 + + 2 (OH)- + H2O2
- H2O2 + H2O -> 2 H2O + O2
- Ca(OH)2 -> Ca2 + + 2 OH
Thus, the aquatic toxicity observed for the reaction mass can be attributed to the adverse effects exerted by the hydrogen peroxide formed upon hydrolysis of calcium peroxide. Indeed, the 48h-LC50 value for daphnia calculated from test data available for hydrogen peroxide based on the chemical reactions above was comparable with the value experimentally determined in the study conducted on the reaction mass. Accordingly, the 21d- NOEC value for Daphnia was derived from test data available for hydrogen peroxide and it was determined to be 1.67 mg/L. Therefore, the lowest chronic toxicity value of 1 mg/L determined for algae was used to calculate PNECs for the aquatic environments.
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