Abstract
The kinetics of zinc desorption by DTPA were investigated in several soils. The rate of desorption of soil zinc and adsorbed zinc was rapid initially and gradually declined with time. The desorption reaction can be described by a two constant rate equation, C=AtB. The rate of zinc desorption in soil containing freshly adsorbed zinc was considerably higher than soil zinc, possibly due to the higher solubility and zinc concentration on the surfaces of soil particulate matter. The amount of zinc desorbed by DTPA, however, continued to decrease with increasing aging time. Elevated temperature further enhanced zinc aging and reduced zinc extractability. Recrystallization of adsorbed zinc in soil which subsequently increased the bonding strength of adsorbed zinc, could be responsible for the reduction of zinc desorption by DTPA.
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