Abstract
We demonstrate the applicability of ionic liquid-modified 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 method was used to determine Ag(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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