Journal
MICROCHIMICA ACTA
Volume 178, Issue 3-4, Pages 261-268Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-012-0815-4
Keywords
Pyridine-functionalized magnetic nanoparticles; Solid-phase extraction; Preconcentration; Palladium; Flame atomic absorption spectrometry
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We present a study on the application of magnetic nanoparticles (MNPs) prepared from Fe3O4 and functionalized with pyridine as an adsorbent for the solid-phase extraction of trace quantities of Pd(II) ion. The pyridine group was immobilized on the surface of the MNPs by covalent bonding of isonicotinamide. The modified MNPs can be readily separated from an aqueous solution by applying an external magnetic field. Effects of pH, the amount of functionalized MNPs, extraction time, type and quantity of eluent, desorption time, break-through volume and interfering ions on the extraction efficiency were optimized. The amount of Pd(II) was then determined using FAAS. Under the optimized conditions, the detection limit and preconcentration factor are 0.15 mu g L-1 and 196, respectively, and the relative standard deviation (at 20 mu gL(-1); for n = 10) is 3.7 %. The method had a linear analytical range from 1 to 80 mu g L-1 and was applied to determine Pd(II) in spiked tape water and soil.
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