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Fig. 2. Fractional desorption of PO4 in 0.01 M KNO3 background electrolyte at pH 5 with a solid concentration of 2 g L–1: (a) organic matter (OM) sorbed to phosphated goethite and (b) PO4 sorbed to OM-treated goethite. Abbreviations used: P, phosphate; GA, galacturonate; PGA, polygalacturonate; MU, mucigel. Sequence of abbreviations indicates the sequence of sorbate addition. Dashed lines are the model fits using Eq.[1]. Error bars are given as standard errors of three replicate measurements.
