Registration Dossier
Registration Dossier
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EC number: 266-007-8 | CAS number: 65996-74-9 The oxidized surface of steel produced during reheating, conditioning, hot rolling, and hot forming operations. This substance is usually removed by process waters used for descaling, roll and material cooling, and other purposes. It is subsequently recovered by gravity separation techniques. Composed primarily of high-purity iron oxides. May contain varying amounts of other oxides, elements, and trace compounds.
Toxicity to microorganisms
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.
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