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Fig. 3. Changes in ${zeta}$ -potential of pure and PGA-coated goethite during phosphate sorption (I = 0.01 M KNO₃, pH = 5). Note that x-axis is log scale. Error bars indicating the standard error of 10 replicate measurements are within the symbol size. Initial ${zeta}$ -potentials of the samples (no phosphate contact) are presented in Table 1. Figures after ‘G’ refer to the rounded C content of the sample in milligram C per gram.