Abstract
Abstract Processes controlling the estuarine behaviour of phosphate have been investigated using a model estuarine mixing system. Different phosphate vs. salinity profiles were produced when seawater was added to artificial freshwaters of various pH and concentrations of iron, humic acid and phosphate. These profiles simulate observed phosphate behaviour in real estuaries, and are the result of a balance between phosphate adsorption onto colloidal iron phases in the freshwater, subsequent colloidal aggregation, phosphate desorption, and dilution with seawater. Changes of pH have a larger effect on phosphate behaviour than do changes of salinity.
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