The presence of BSA association had a greater effect on hausmannite than on K-birnessite adsorption-desorption kinetics. Furthermore, with BSA association the ka values for each K-birnessite and hausmannite become more similar at both pH (~0.16 -0.17 and ~0.12 min -1 , respectively). This suggests BSA association is more important than pH in determining rate of adsorption. Further, the presence of BSA association primarily diminished the intensities of adsorbed glyphosate (15.2 -28.5 %; Δν(PO)ads) at all conditions (Figure and Table ) this reduction was greater at pH 7.2 (35.9 -59.5 %) rather than pH 4.6 (15.2 -28.5 %).