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Aluminium dross is unlikely to have direct toxic effects on aquatic organisms. Its main constituents [metallic 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. The other breakdown product of aluminium nitride is ammonia which is a highly toxic substance for aquatic environments in high concentrations. Nevertheless, the rate of ammonia production is very low (Endpoint 4.13: Final report, ALUFLUX or Aluminium dross or gray Aluminium dross Batch No.: Production of year 2009 - FLAMMABILITY, A12., Smeykal, H., 2010). The total amount of produced ammonia in the unit of the examined substance is also low, provided that aluminium dross is directed in a substantial water body.The impurities of aluminium dross are either of insignificant toxicological profile or of concentrations insufficient to trigger relevant classification for the whole mixture.