Mar 1, 1989

Proton and copper adsorption to maize and soybean root cell walls

Plant Physiology
D L Allan, W M Jarrell


A surface complexation model which has been used to describe inner-sphere complexation on metal oxide surfaces was applied to the adsorption of Cu by isolated cell walls of 4-day and 28-day-old maize (Zea mays L. cv WF9 x Mo17) and 21-day-old soybean (Glycine max [L.] Merr. cv Dare) roots. Concentration dependence of the titration data prevented the determination of unique pK and capacitance values for the 4-day maize cell walls, though mean values obtained for the intrinsic pK of the titratable carboxyl groups were 3.0 (4-day maize), 3.6 (28-day maize), and 3.0 (21-day soybean) as determined by potentiometric titration with either NaOH or HCl in 20 millimolar NaCl. The constant capacitance model was applied to Cu sorption data from rapid batch equilibrium experiments in an ionic medium of 20 millimolar NaClO(4). Speciation calculations indicated that the formation of a bidentate surface complex was sufficient to describe the experimental data for all three types of plant material, with only one value for the pK and capacitance density. The intrinsic constants of Cu complexation by a neutral site are: log K = -0.3 +/- 0.1, -0.2 +/- 0.3, and 0.9 +/- 0.1 for 4-day and 28-day maize, and 21-day soybean, respectively. The integral c...Continue Reading

Mentioned in this Paper

Corn extract
Glycine max
Soybean preparation
Zea mays
Glycine max antigen
Zea mays antigen
Cell Wall
Soybean allergenic extract
Sodium Chloride

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