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EC number: 201-279-3 | CAS number: 80-43-3
- 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
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 2.34 µg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 2.24 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- no exposure of sediment expected
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.447 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
The following effect concentrations and considerations are used for the assessment:
Aquatic toxicity
Short-term toxicity
Dicumyl peroxide showed no acute toxicity in any of the test organisms when tested up to the maximum water soluble concentration.
Long-term toxicity to fish
According to Annex IX of Regulation (EC) No 1907/2006 chronic fish toxicity tests should be proposed if the chemical safety assessment indicates the need to investigate further the effects on fish. However, the existing information is sufficient for risk assessment. Therefore, testing of chronic fish toxicity is not considered to be necessary.
Long-term toxicity to aquatic invertebrates
The 21-day-chronic toxicity of dicumyl peroxide to Daphnia magna was studied under static renewal conditions. The parental 21-day EC50 based on mortality was 0.195 mg/L, the 21-day EC50 for reproduction was 0.231 mg/L. The 21-day NOEC based on average cumulative number of offspring was 0.117 mg/L, the 21-day LOEC was 0.247 mg/L. Sublethal effects were observed at 0.247 mg/L (body colour brightening and growth inhibition, besides lethargy, immobility, and activity drop). No symptoms were observed in the other concentration levels. Dead larvae were observed in all the test levels, with 0.247 mg/L slightly higher than the control. Fallen eggs were also observed in all test levels, the 0.117 mg/L level showing a statistically significant difference. Production of offspring in the treated groups indicated that dicumyl peroxide had an effect on reproduction at concentrations greater than 0.117 mg/L. The most sensitive endpoint was reproduction.
Toxicity to algae
In a 72 hour toxicity study, cultures of Pseudokirchnerella subcapitata (reported as Selenastrum capricornutum), strain ATCC 22662, were exposed to dicumyl peroxide. Both the 72 h EbC50 and the 72 h NOEbC values based on cell density were > 20 mg/L and 3.20 mg/L, respectively (nominal). Both the 24-48 h ErC50 and the 24-72 h ErC50 were > 20 mg/L, whereas the 24–48 h NOEC and the 24–72 h NOEC values based on growth rate were 8 mg/L, respectively (nominal). Both the EC50 and the NOEC indicated no effect up to maximum water soluble concentrations.
Toxicity to microorganisms
In an activated sludge respiration inhibition test, secondary activated sludge of a sewage treatment plant receiving predominantly domestic sewage was exposed to dicumyl peroxide adsorbed on silica gel at a concentration of 1000 mg/L (nominal) under static conditions for 30 min, in accordance with OECD guideline 209 (activated sludge, respiration inhibition test). The NOEC based on respiration inhibition was > 1000 mg/L.
Toxicity to sediment dwelling organisms
The equilibrium partitioning method has been used for assessing the risk to sediment organisms. In view of the log Pow of 5.6 a potentially increased hazard to sediment organisms is indicated, requiring application of an additional assessment factor to the EPM-based RCR (see guidance on information requirements and chemical safety assessment, part E: risk characterisation). However, the chemical safety assessment using the EPM gives no indication for an unacceptable risk towards sediment organisms. Therefore, in accordance with Annex X, column 2, point 9.5.1 of Regulation (EC) No 1907/2006, testing of sediment organisms is not considered to be required.
Terrestrial toxicity
The equilibrium partitioning method has been used for assessing the risk to soil organisms. In view of the log Pow of 5.6 a potentially increased hazard to soil organisms is indicated, requiring application of an additional assessment factor to the EPM-based RCR (see guidance on information requirements and chemical safety assessment, part E: risk characterisation). However, the chemical safety assessment using the EPM gives no indication for an unacceptable risk towards soil organisms. Therefore, in accordance with Annex X, column 2, point 9.5.1 of Regulation (EC) No 1907/2006, testing of soil organisms is not considered to be required.
According to REACH Annex X, 9.6.1, column 2, there is no need for testing toxicity to birds. Dicumyl peroxide is unlikely to accumulate in the food chain based on the highest experimental BCF value.
Conclusion on classification
Due to the fact that dicumyl peroxide showed no acute toxicity towards algae, Daphnia and fish at maximum water solubility there is no need to change the current legal classification. The substance is legally classified as aquatic chronic 2 (H411) according to the CLP Regulation (1272/2008), and as R51/53 according to the DSD (67/548/EEC).
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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