Abstract
Large areas of variable charge soils are distributed in tropical and subtropical regions of the world. Adsorption reactions of heavy metals are important factors controlling their mobility in soils. Low cation exchange capacity and pH create conditions conducive to increase mobility of heavy metal cations, but decrease the mobility of anions such as arsenate and chromate in these soils. In this Chapter, the adsorption mechanisms of heavy metals and their competition for adsorption sites on variable charge surfaces as well as the effects of ionic strength, pH, surface chemical properties and accompanying anions on the adsorption in this type of soil are summarized. The results presented here can help to understand the adsorption processes of heavy metals in variable charge soils and provide useful references for the control of soil heavy metals pollutions and remediation of heavy metal-contaminated soils in tropical and subtropical regions.
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