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Fig. 5. ${zeta}$ -Potential changes during phosphate sorption of freeze-dried uncoated and PGA-coated goethites at the highest PGA-level. The solid lines show linear regressions. Error bars are SE. Values in parentheses represent the C loading in mmol C g^–1. Initial ${zeta}$ -potentials (mV) at pH 5 in 0.01 M KNO₃ were: G1: 29.8 ± 3.5, G2: 29.1 ± 0.5, G1 (1.76): –29.0 ± 3.6, G2 (1.43): –28.5 ± 1.2. The x axis is in logarithmic scale.