Fig. 3

Mg and Si mobilization from 1 g L^− 1 pristine and preconditioned fibers incubated at pH 7.4 (50 mmol L^− 1 MOPS) with addition of 3.34 g L^− 1 H₂O₂. Panel a.) Mobilized Mg (a1) and Si (a2) concentrations from pristine, blank-altered and DFOB-altered fibers; Panel b.) Mobilized Mg (b1) and Si (b2) concentrations from DFOB-altered fibers + 0, 3, 30 and 300 μmol g^− 1 Fe. The arrows indicate a decrease in mobilized Mg and Si concentration with increasing Fe addition; Panel c.) Mobilized Mg (c1) and Si (c2) concentrations from blank-altered fibers + 0, 3, 30 and 300 μmol g^− 1 Fe. Error bars indicate standard deviations (n = 2)