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This research examines how orthophosphate adsorption occurs when bound to humic substances and various Fe compounds.

Adsorption of Orthophosphate to Humic‐Fe‐Complexes and to Amorphous Fe‐Oxide

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This research examines how orthophosphate adsorption occurs when bound to humic substances and various Fe compounds.
Model experiment exploring orthophosphate adsorption to humic and amorphous Fe-oxide surfaces.
Variations in pH and CaCl2 concentration were manipulated to assess their effects on adsorption.
Analysis of the ratio of absorbed P to Fe for different complexes.
High organic Fe(III) concentrations led to a nearly 1:1 ratio of P adsorbed to Fe for humic substances.
A 30% increase in P adsorption occurred when pH was raised from 5.2 to 6.2 on humic-Fe surfaces.
Orthophosphate adsorption increased at pH 6.2 with added CaCl2, attributed to electrostatic interactions.

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Model experiment shows increased orthophosphate adsorption in humic-Fe-complexes, highlighting interactions.

Gerke et al. (1992) studied this question.

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