ABSTRACT
In many industrial countries, soils are affected by mine waste disposal, acid deposition, and sewage sludge use that could provide large inputs of pollutants and especially trace elements (TEs) to the soils. TEs are dened as elements that are present at low concentrations (mg kg-1 or less) in most soils, plants, and living organisms. TEs that have been most extensively studied in soils are those that are essential for the nutrition of higher plants and include copper (Cu), zinc (Zn), iron (Fe), manganese (Mn), molybdenum (Mo), boron (B), cobalt (Co), or selenium (Se). During the last two decades or so, the role of TEs as environmental contaminants has dominated the literature, and TEs
CONTENTS
Introduction ......................................................................................................... 237 Materials Containing Phosphates Available at a Practical Scale ..................238
