Adsorção de cádmio, cobre e zinco em argissolos, plintossolos e cambissolos da Bacia Hidrográfica do Rio Camará Estado da Paraíba.

Abstract

Heavy metal can be added to the soils through disposal of city wastes, sewage sludge and a variety of agricultural treatments. Its availability to plants, persistency and mobility in soils are determined by the extent of its adsorption by soil particles. This study was carried out to obtain quantitative relationship between Zn, Cu and Cd in equilibrium solution and those retained by Argisol, Plinthosols and Cambisol from Camará watershed, Paraiba State, using Langmuir model. In order to quantify these adsorbed elements, 2 g of air-dried soil were equilibrated with 20 mL of solution containing different quantities of Zn (5 - 50 mg L-1), of Cu (5 - 80 mg L-1) and of Cd (20 - 200 mg L-1). The study showed that Langmuir model offered a good fit for Zn, Cu and Cd. Zinc was