Registration Dossier
Registration Dossier
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EC number: 273-708-2 | CAS number: 69011-71-8 A scum formed on the surface of molten aluminum and molten aluminum alloys.
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.117 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Marine water
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
STP
- Hazard assessment conclusion:
- no emission to STP expected
Sediment (freshwater)
- Hazard assessment conclusion:
- no exposure of sediment expected
Sediment (marine water)
- Hazard assessment conclusion:
- no exposure of sediment expected
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no exposure of soil expected
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Some of the main constituents of Aluminium dross [aluminium, aluminium oxide and aluminium hydroxide (the breakdown product of aluminium nitride)] are highly insoluble in water(< 1 mg/L) (see also Krewski et al, 2007) making bioavailability and crossing of biological membranes unlikely in aquatic environments.Aluminium chloride may be considered, as a representative of the soluble/bioavailable fraction of aluminium compounds. Aluminium chloride exhibits varied toxicities towards freshwater species (fish, crustaceans, algae).
The other breakdown product of aluminium nitride is ammonia which is a highly toxic substance for aquatic environments. Nevertheless, the rate of ammonia production is low (see also Smeykal, 2010d). The total amount of produced ammonia in the unit of the examined substance is also low. The impurities of aluminium dross are either of insignificant toxicological profile or of concentrations insufficient to trigger relevant classification for the whole mixture. For all these reasons PNEC aquatic has been calculated on the basis of ammonia, which is a well-known aquatic toxicant. Other environmental compartments (terrestrial, sediment, sewage treatment plants) have not been considered due to the limited use and distribution in a closed system of Aluminium dross which renders direct or indirect contact with the substance unlikely. For these reasons secondary poisoning via the food chain is also unlikely.
Conclusion on classification
No sufficient for classification for environmental hazards.
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