Abstract
A new method using nonanoic acid-coated magnetic Fe3O4 nanoparticles as adsorbent has been developed for the single-step extraction and preconcentration of lead and copper in tobacco samples. Transmission electron microscopy and X-ray diffraction spectrometry were used to characterize the adsorbent. The experimental parameters affecting extraction efficiency, including amount of nanoparticles, volume of chelating reagents, sample pH, ultrasonic time and desorption conditions were investigated. The analytes desorbed from nanoparticles were determined by flame atomic absorption spectrometry. Under the optimum conditions, good linearity was obtained in the range of 2-400 µg L-1 for copper and 5-800 µg L-1 for lead (r > 0.998, p < 0.05). The limits of detection for copper and lead were 0.2 and 0.5 µg L-1, with enrichment factors of 45 and 52, respectively. The method was successfully employed to tobacco sample analysis and got excellent recoveries between 89.2 and 100.7% with relative standard deviations (n = 6) of 4.5-5.9%.
Highlights
Lead (Pb) is one of the most common heavy metal contaminants in the environment,[1] which ascribe to its widely application[2] and PbII-induced oxidative stress contributes to the pathogenesis of PbII poisoning for disruption of the delicate prooxidant/antioxidant balance that exists within zooblasts.[3]
The transmission electron microscope (TEM) images showed that the edge morphology of Fe3O4@NA NPs became blurred because the particles’ surface was encapsulated with nonanoic acid and the prepared Fe3O4@NA NPs were stabilized against agglomeration by monolayer of nonanoic acid
The hydrophobicity of Pb-Ammonium pyrrolidine dithiocarbamate (APDC) and Cu-APDC are much higher than Pb and Cu, so when APDC exists, Pb/Cu-APDC could be efficiently adsorbed by the hydrophobic nonanoic acid-coated Fe3O4 NPs
Summary
Lead (Pb) is one of the most common heavy metal contaminants in the environment,[1] which ascribe to its widely application[2] and PbII-induced oxidative stress contributes to the pathogenesis of PbII poisoning for disruption of the delicate prooxidant/antioxidant balance that exists within zooblasts.[3]. The functionalized magnetic nanoparticles showed good selectivity for extraction and preconcentration of PbII, and CuII in tobacco samples. The magnetic nanoparticles with adsorbed metals ions were separated from the suspension by an Nd-Fe-B permanent magnet and the supernatant was decanted directly, the residual MNPs were eluted by 1 mL methanol-nitric acid and ultrasonicated for 1 min for desorption of adsorbed Pb-APDC and Cu‐APDC.
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