Solid phase extraction (SPE) technique has
found increasing application for the preconcentration
of trace metal ions and elimination of matrix
interference prior to AAS analysis. Different sorbents such as Amberlite XAD resins [14–17],
activated carbon [18–20], C-18 bonded silica
[21,22] and others [23,24] have been used for the
preconcentration of trace metal ion from various
media.