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The ways that trace elements exist in reef tanks, and the way they are taken up are very complex and poorly understood. Even in the ocean these things are not always well known, despite being studied.
I thought these quotes from a paper I was reading might be of interest:
The chemical speciation of iron in the north-east Atlantic Ocean
https://www.sciencedirect.com/science/article/pii/S0967063706000161
There is still uncertainty about which form(s) of iron (organically complexed Fe(III), inorganic Fe(III), or Fe(II)) is bioavailable.
Recent work indicates that the bioavailable iron may well be inorganic Fe(III) taken up in a reductive process. Counter intuititively the concentration of such Fe(III) can be enhanced by siderophores , facilitating photochemical reduction of Fe(III) to transient Fe(II), with a subsequent re-oxidation to fresh Fe(III).
In this study, total dissolved iron averaged 0.79 nM .... the iron was 99% organically complexed, leaving a calculated inorganic Fe(III) concentration of 10.476 pM
The presence of Fe(II) shows that these waters are not at thermodynamic equilibrium. The concentration of Fe(II) was greater than that of inorganic Fe(III), indicating that this transient Fe(II) greatly changes the chemical speciation of iron.
I thought these quotes from a paper I was reading might be of interest:
The chemical speciation of iron in the north-east Atlantic Ocean
https://www.sciencedirect.com/science/article/pii/S0967063706000161
There is still uncertainty about which form(s) of iron (organically complexed Fe(III), inorganic Fe(III), or Fe(II)) is bioavailable.
Recent work indicates that the bioavailable iron may well be inorganic Fe(III) taken up in a reductive process. Counter intuititively the concentration of such Fe(III) can be enhanced by siderophores , facilitating photochemical reduction of Fe(III) to transient Fe(II), with a subsequent re-oxidation to fresh Fe(III).
In this study, total dissolved iron averaged 0.79 nM .... the iron was 99% organically complexed, leaving a calculated inorganic Fe(III) concentration of 10.476 pM
The presence of Fe(II) shows that these waters are not at thermodynamic equilibrium. The concentration of Fe(II) was greater than that of inorganic Fe(III), indicating that this transient Fe(II) greatly changes the chemical speciation of iron.