Interaction and binding of dissolved orthophosphate on insoluble complexes of marine humic substances and calcium, magnesium, iron and aluminium have been studied. The results pointed out that solubility of metal-humic and fulvic complexes increases as the pH of the suspension increases with strong phosphorus fixation at pH-values between 4 and 6. The possible mechanism of this binding involves formation of a complex association in which metal ions bound to the humic substances act as a bridge between humic macromolecules and phosphate anion.

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