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Abstract
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We demonstrate the applicability of ionic liquidmodified
silica-coated Mn3O4 nanoparticles (NPs) as a sorbent
for solid-phase extraction and preconcentration of Ag(I)
ion without a chelating agent. The size, morphology and surface
coating of the nano-sorbent were characterized via X-ray
diffraction analysis, scanning electron microscopy and Fourier
transform IR spectroscopy. Following desorption with HCl,
silver was quantified by AAS. Under optimized experimental
conditions, the calibration graph is linear in the 0.8−
320 ng mL−1 concentration range (with an r2 of 0.9970).
The limit of detection and limit of quantification are 0.2 and
0.8 ng mL−1, respectively. The relative standard deviation (for
n=6; at an Ag(I) concentration of 60 ng mL−1) and
preconcentration factor are 1.9 % and 50, respectively. The
methodwas used to determineAg(I) in (spiked)water samples
and in radiology films. The accuracy of the method was confirmed
by successfully analyzing the certified reference material
NIST SRM 1566b.
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