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EC number: 231-843-4
CAS number: 7758-94-3
This endpoint is covered by the category approach for soluble iron salts
(please see the section for physical and chemical properties for the
category justification/report format).
The following table summarizes the levels considered as background
concentrations in the present assessment. These background
concentrations can be used in the environmental risk assessment.
* calculated from ca. 10 µg/L, as hydroxide
It should be noted that some of the figures may deviate from those
in table A3.1 of the SIAR (SIDS Initial Assessment Report, OECD 2007)
document, which are given below. Nonetheless the above listed
environmental levels are in comparable ranges.
Matrix or organism
(order of magnitude only)
Approx. 5 %*
Atmosphere – background
Atmosphere - urban
Sediment – fresh water and marine
4.5 % d.w.*
River water – background
Approx. 1 mg/L (total)
Sea water – background
Approx. 10 µg/L, as hydroxide
Plants – roots
4000 mg/kg d.w.
200 mg/kg d.w.
Marine sediment organisms
Up to approx. 500 mg/kg d.w.
5 – 30 mg/kg d.w.
Typically up to 600 mg/kg d.w.
* Values deviate from those to be used in the chemical safety
assessment given above
Iron is the fourth most abundant element in the Earth's crust accounting
for approximately 5 % by weight (Wildermuth 2004). Iron is found in
various minerals (as ferric chloride, ferrous chloride, ferric sulphate,
ferrous sulphate and their mixtures, oxides and sulphides) and in nearly
all soils, sediments and mineral waters. Iron levels range from 0.01
mg/L in seawater up to 0.1 – 10 mg/L in fresh water, 0.5 – 5 % in soil
and 1 – 9 % in sediments (Drever 1982, Hem 1970, Horne 1978,
Kabata-Pendias & Pendias 1984, Khalid et al 1977, Lindsay 1979, Morel
1993, Stumm & Morgan 1981). Overall, the data show that iron is present
naturally in abundance in all environmental compartments, apart from
water, where solubility of the hydroxide and oxides is a limiting
factor. The dissolved concentrations of iron tend to be low whereas
sediment concentrations can be high.
Johnson et al (2007) summarize the mobilization of iron from soils with
reference to Schnitzer (1969) as follows: “Hydrous iron(II) oxides
[FeO(OH)] are generally red–brown gels and are the major constituents of
soil. The major iron ores found in nature are haematite (Fe2O3),
magnetite (Fe3O4), limonite [FeO(OH)] and siderite (FeCO3). Iron in
crustal rocks is mobilized by weathering of iron silicates and
carbonates. The weathering products are oxidized and hydrolyzed to
insoluble ferric hydroxides and hydrous oxides that are then transported
within the aquatic environment.”
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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