Journal article

Competitive adsorption of sulfate and oxalate on goethite in the absence or presence of phosphate

F Liu, JZ He, C Colombo, A Violante

Soil Science | LIPPINCOTT WILLIAMS & WILKINS | Published : 1999

Abstract

A study was carried out to examine the competition in adsorption of sulfate (SO ) and oxalate (OX) on goethite as affected by pH, concentration of the ligands, order of anion addition, and the presence of phosphate (PO ). The purpose was to obtain useful information about the factors that influence the adsorption of ligands, which have different affinity (PO >> OX > SO ) for this variable charge mineral. More OX than SO was adsorbed for the pH values between 3.0 and 7.5. When equimolar amounts of SO and OX were added, the molar ratio of adsorbed OX to adsorbed SO ranged from 2.25 to 3.78 in the pH range between 3.5 and 6.0. The sequence of anion addition influenced the adsorption of SO ..

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