The synthetic methods of solid phase extractors
and preconcentrators are mainly based on the
surface modification of the solid supports by either
the chemical immobilization or physical adsorption
approaches [7,8]. The modified solid sorbents
are then used and applied in the fields of normal or
selective SPE of the target species [9,10]. Such
variations in the behavior of the modified solid
sorbents are mainly dependent on the presence of
some active donor atoms or groups such as O, N, S
and P into the incorporated organic modifier.