Background: Polymer based adsorbents and their modified forms by various
ligands have been effectively used for separation, preconcentration, determination
and removal of heavy metal ions from different matrices. This paper proposes a solid
phase extraction method based on 5-amino-1,10-phenanthroline (5-Aphen) functionalized
glycidyl methacrylate-methyl methacrylate-divinylbenzene (GMA-MMA-DVB)
crosslinked-polymeric microspheres for the determination of Fe (II), Ni (II), Pb (II)
and Zn (II) in herbal tea samples employing flame atomic absorption spectrometry
Methods: The prepared adsorbent was characterized by FT-IR spectroscopy and BET.
Several experimental variables affecting the sensitivity and efficiency of SPE method
for the metal ions studied were investigated in detail by FAAS.
Results: The optimal values of the adsorbent amount, pH, eluent properties, and flow rates were determined.
The preconcentration factor and detection limits of the proposed SPE method and the maximum
capacity of the adsorbent were found. The validity of the method was verified by the analysis of certified
reference material. The developed method was successfully applied to herbal tea samples for the simultaneous
preconcentration of Fe (II), Ni (II), Pb (II) and Zn (II) ions.
Conclusion: The SPE method based on 5- Aphen functionalized GMA-MMA-DVB for some trace metal
ions in herbal tea samples is simple, accurate, fast, low cost, high preconcentration factor and environmentally
friendly. This method can also be employed to evaluate the possible risk associated with heavy