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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

Environmental waters are in contact with natural sources of iron, which control iron concentrations at or below the limit of solubility. Additional input of iron compounds cannot increase the iron concentration to above its saturation level, nor can it inhibit growth and proliferation of micro-organisms.

Key value for chemical safety assessment

Additional information

Iron salts are widely used in sewage treatment plants (STPs) to remove nutrients such as phosphates by precipitation. Discharge at such plants is at concentrations typically below 1 mg/L. The low solubility of iron salts and their widespread use as a precipitation agent in wastewater treatment means that iron is unlikely to be toxic to microorganisms. Thus, no effects on microbial activity at concentrations typically below 1 mg/L were recorded in the literature and according to a U.S. EPA survey, effects are only seen at between 5 – 500 mg Fe/L; other studies report higher concentrations in STPs. Further testing is therefore not considered necessary.