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Fig. 4. ${zeta}$ -Potential of C-free, polygalcturonate- and mucigel-treated goethites during phosphate desorption. After each reaction time about 200 µg of freeze-dried 0.45-µm filter residue were resuspended into 4 mL of 0.01 M KNO₃ at pH 5. Sequence of abbreviations indicates the sequence of sorbate addition. Error bars are given as standard errors.