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Updated: May 21, 2025

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
Published on: August 7, 2016
Magnetic Solid Phase Extraction of Lead (II) and Cadmium (II) From Water Samples Using ZnO@Fe3O4 Nanoparticles
Şeyma Korkmaz1, Elvan Hasanoğlu Özkan2, Demet Uzun2
1Department of Chemistry, Faculty of Arts and Sciences, Kırklareli University, Kırklareli, Türkiye.
Abstract:
A new magnetic solid phase extraction method was developed utilizing magnetically enhanced zinc oxide (ZnO@Fe3O4) nanoparticles for the separation and enrichment of lead (II) and cadmium (II) before sample determination through flame atomic absorption spectrometry. The ZnO@Fe3O4 nanoparticles synthesized by the hydrothermal method were characterized by x-ray diffraction, scanning electron microscopy, and energy-dispersive x-ray spectroscopy. The experimental factors like pH (6.0), eluent type and concentration (1 M nitric acid for lead (II), 1 M hydrochloric acid for cadmium (II)), adsorbent amount (150 mg for lead (II), and 200 mg for cadmium (II)), sample volume (5 mL), and extraction time (5 min for lead (II), and 10 min for cadmium (II)) were optimized. Under the optimization conditions, limits of detection of 2.36 and 7.86 µg/L for lead (II) and cadmium (II) were obtained with a wide concentration range from 50 to 5000 µg/L, respectively. The presented method was successfully applied to real water samples with spiked recoveries in the range of 99.2%-101% for lead (II) and 99.6%-100% for cadmium (II).
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