order to separate the solid residues (pellet) from the
leachate (supernatant). The extraction experiments
were done in triplicate. Deionized water was used as
blank in the metal extraction step and also in the
analyzing step. The above leachate supernatant was
then filtered through No. 42 Whatman filer paper
before further analysis. Lead concentrations in the
extracting agents (leachate and EDTA) were analyzed
by Flame Atomic Absorption Spectrometry.