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Abstract
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An Al-doped ZnO@Fe3O4 nanocomposite was
synthesized and used as a magnetic sorbent for solid-phase
extraction of Cd(II) prior to its determination by flame atomic
absorption spectrometry (FAAS). The size and morphology of
the nano-sorbent were characterized via X-ray diffraction
analysis, scanning electron microscopy and FTIR. Following
its desorption with acetic acid, cadmium was quantified by
FAAS. Factors affecting the extraction of the Cd(II) were optimized.
Under optimized experimental conditions, the calibration
graph is linear in the 0.6 to 60 ng mL−1 concentration
range. The limit of detection is 0.17 ng mL−1 and the preconcentration
factor is 50. The inter- and intra-day relative
standard deviations for six replicate determinations at a
Cd(II) level of 40 ng mL−1 are 3.8% and 2.5%, respectively.
The method was successfully applied to the trace determination
of Cd(II) in spiked water samples. The accuracy of the
method was confirmed by analyzing the certified reference
material NIST SRM 1643e.
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