"The speciation of ions could affect their bioavailability. For example the ratio of soluble to insoluble iron may be increase making iron more available and reducing the growth limiting effect that low soluble iron concentrations have in some areas. The low availability of soluble iron has been shown to limit the growth of phytoplankton in the Southern Ocean and by artificially increasing soluble iron concentrations there is an increase in photosynthetic activity and phytoplankton biomass [7].
Figure 6. The speciation (a) and the measured solubility (b) of Fe(III) in seawater as function of pH. From Millero 1998 [8].
However, changes to metals speciation, could possibly allow for more free dissolved heavy metals and an associated increased toxicity effect. "
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