The soil sample collected had a pH of 6.50, a sandy percentage of 85.52, silt percentage of 5.28, clay percentage of 9.2, organic matter content of 3.25 and cation exchange capacity of 8.90 meg/100g. the soil was spiked with the salts to increase the metal concentration and incubated for two weeks. The contaminated soil was amended with natural clay and phosphate salt at different dosage levels and allowed to equilibrate for two weeks A 0.1m calcium Chloride and 1M ammonium acetate solution were used as extractants for bioavailable metal ions. The filtrate was analyzed with AAS. the result revealed that inorganic fixing agents such as natrual clay and phosphate salt are suitable for heavy metal immobilization. Since they reduced the concentrations of the metal ions available for plant uptake.
Mdue et al. (Fri,) studied this question.