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Abstract
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Magnesium(II)-doped nickel ferrite (Mg–NiFe2O4) nanoparticles are introduced as a new adsorbent for magnetic solid phase
extraction of lead(II) ions from aqueous solutions. The structure and morphology of the adsorbent was characterized by FTIR, Xray
diffraction and scanning electron microscopy. The effects of pH value, amount of adsorbent, type, concentration and volume
of the eluent and adsorption/desorption time on the extraction efficiency were studied. Following elution with hydrochloric acid,
Pb(II) ions were quantified by flame atomic absorption spectrometry. Under optimized conditions, the calibration graph is linear
in the 0.5–125 ng mL−1 Pb(II) ion concentration range. Other figures of merit include (a) a 0.2 ng mL−1 limit of detection, (b) an
enrichment factor of 200, (c) an intra-day relative standard deviation (for n = 6 at 50 ng mL−1) of 1.6%, and (d) an inter-day
precision of 3.8%. The method was validated by the analysis of the certified reference material, NIST SRM 1566b. It was
successfully applied to the determination of Pb(II) ion in spiked water samples, industrial wastewater and acidic lead battery
waters.
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