Registration Dossier
Registration Dossier
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EC number: 932-833-9 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
The complexation of iron by citrate is complicated. Citrate, iron(III) and ammonium form a variety of coordination complexes in aqueous solution. Key factors determining the species formed in laboratory studies are the pH and the iron:citrate ratio. At neutral pH and approximately equimolar amounts of iron and citrate, equilibrium between various mono and polynuclear species might be expected, with 3:3 iron/citrate species being important. In the environment, the species formed will be dependent on the pH, the presence of other metal ions, the presence of other complexing agents, the presence of iron and citrate from other sources (both are ubiquitous in biology) and the temperature. Thus, the effect of introducing ammonium iron (III) citrate to the environment is not expected to differ significantly from that of adding iron (III), ammonium and citrate separately. The majority of the discussion in this section is presented in terms of the individual components: iron (III), citrate and ammonium.
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