ABSTRACT
Competing ions strongly affect heavy metals retention and release in soils. Industrial waste and sewage sludge disposed on land often contain appreciable amounts of heavy metals, such as Cu, Zn, Cd, and Ni, and thus create a risk for croplands, as well as animals and humans (Atanassova, 1999; McIlveen and Negusanti, 1994). In most cases, soil contamination involves
CONTENTS
1.1 Nickel and Cadmium ....................................................................................2 1.1.1 Case Study ..........................................................................................4 1.1.2 Ni and Cd Isotherms .........................................................................4 1.1.3 Sorption ...............................................................................................7 1.1.4 Sheindorf-Rebhun-Sheintuch (SRS) Model .................................. 11
1.2 Zinc ................................................................................................................ 14 1.2.1 Case Study ........................................................................................ 15 1.2.2 Kinetics .............................................................................................. 17 1.2.3 Multireaction Model ........................................................................ 19 1.2.4 Desorption Hysteresis ..................................................................... 21 1.2.5 Transport ...........................................................................................23
