INORGANIC AND ORGANIC SOIL AMENDMENTS USED FOR THE IMMOBILIZATION OF CADMIUM IN CONTAMINATED SOILS - Management of Hazardous Residues Containing Cd - page 99

Chapter 3

I NORGANIC AND O RGANIC S OIL
A MENDMENTS U SED FOR
THE I MMOBILIZATION OF
C ADMIUM IN C ONTAMINATED S OILS

Silvana Irene Torri *
School of Agronomy, University of Buenos Aires
Av San Martín 4453, Buenos Aires, Argentina

A BSTRACT

Chemical stabilization is an in situ remediation method that uses
inexpensive amendments to reduce contaminant´s availability in polluted
soil. Amendments may adsorb, bind or co-precipitate the contaminating
elements. Cadmium (Cd) is known as more mobile and soluble than
many other potentially trace element in soils. Furthermore, it has been
identified as a major toxic element reaching the food chain, directly
through crop uptake or indirectly through animal transfer. Recently there
has been increasing interest in the immobilization of Cd using a range of
inorganic compounds, such as lime and phosphate compounds, or organic
compounds, such as biosolids compost. In this chapter, the feasibility of
using these amendments to immobilize Cd in Cd-contaminated soils is
discussed.