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EC number: 701-325-7 | CAS number: -
Short-term toxicity to aquatic invertebrates
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
- Reimer PS (1999) Environmental effects of manganese and proposed freshwater guidelines to protect aquatic life in British Columbia [MSc thesis]. Vancouver, B.C., University of British Columbia, Canada.
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
Manganese toxicity to aquatic invertebrates is antagonized by calcium which is evidenced by Reimer (1999) for daphnids (Daphnia magna), an amphipod (Hyalella azteca), and a midge (Chironomus tentans). The effects were studied in the presence of 25 to 250 mg calcium carbonate per litre, which corresponds to 0.25 to 2.5 mol/L or 10 to 100 mg calcium/L (MW CaCO3 = 100.0872 g/mol; MW Ca = 40.078 g/mol). The respective threshold levels were 48 h LC50 0.8 to 76.3 mg/L, 96 h LC50 3.6 to 31 mg/L, and 5.8 to 94.3 mg/L. As calcium is generally present under environmental conditions and is a constituent of the submission item itself (2.2 % of metal molarity) the upper ranges of the calcium dependent toxicity levels should be considered. Numerous values were published, but the calcium level is almost not reported. Thus the resulting environmentally relevant threshold level is considered in the range from 10 to 100 mg/L and assigned for assessment to 31 mg/L. As a large range of organisms were tested and the metal is bioessential a significantly reduced assessment factor should apply. The hazard to the aquatic life is assessed on the basis of a Species Sensitivity Distribution (SSD) calculation (see discussion on Aquatic toxicity).
Aluminium
No valid and conclusive studies are available or can be made under laboratory conditions (see discussion on Aquatic toxicity).
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