ABSTRACT
Linear and nonlinear forms are usually employed to describe Nickel (Ni) adsorption on mineral and soil surfaces. The capability of multireaction model to describe Ni desorption versus time was tested by Lixia Liao and H. Magdi Selim. The bioavailability and mobility of Ni influence the amounts taken up by plants and microorganisms and thus the toxicity of the environment. The average concentration of Ni in soils is 40 mg/kg. Kinetics of these elements indicates that some may be present in the structure of the iron oxides, which is partially irreversible or slow reversible. Such findings provide evidence that iron oxides may be responsible for the observed hysteretic or partially reversible sorption of Ni for all soils. Sorption of Ni on minerals, clay fractions, and soils has been frequently measured using the traditional batch equilibration method. The chapter presents experimental measurements and modeling efforts of the transport of Ni in the soils.
