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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

No meaningful threshold levels can be identified and no toxicity is assumed for iron and aluminium. Manganese effects were assessed by SSD.

Key value for chemical safety assessment

Additional information

Iron

No valid and conclusive studies are available or can be made under laboratory conditions (see discussion on Aquatic toxicity). It is concluded that acute and chronic aquatic toxicity testing with the submission item or Fe(II) salts in general is under aerobic conditions technically not feasible and scientifically unjustified. Up to the level of its water solubility, which is almost identical to the natural background concentrations no toxicity is assumed.

Thus the threshold levels for the submission item need to derived from effects of the remaining relevant major components, aluminium and manganese.

Manganese

The most sensitive species seem to be a marine diatom (Ditylum brightwellii), with a 5-day EC50, based on growth, of 1.5 mg manganese per L (tested as dichloride, Canterford & Canterford 1980), and a freshwater alga (Scenedesmus quadricauda) with a 12-day EC50, based on chlorophyll inhibition, of 1.9 mg manganese per L (tested as sulphate, Fargašová et al 1999).

The hazard to the aquatic life is assessed on the basis of a Species Sensitivity Distribution (SSD) calculation (see discussion on Aquatic toxicity).

  • Canterford GS, Canterford DR (1980) Toxicity of heavy metals to the marine diatom Ditylum brightwellii (West) Grunow: correlation between toxicity and metal speciation. Journal of the Marine Biological Association of the U.K. 60:227–42
  • Fargašová A, Bumbalova A, Havranek E (1999) Ecotoxicological effects and uptake of metals (Cu+, Cu2+, Mn2+, Mo6+, Ni2+, V5+) in freshwater alga Scenedesmus quadricauda. Chemosphere 38(5):1165–73.

Aluminium

No valid and conclusive studies are available or can be made under laboratory conditions (see discussion on Aquatic toxicity).