Abstract
A new method for separation/preconcentration of trace As in environmental samples by micro solid-phase extraction (μ-SPE) using CoFe2O4@SiO2 magnetic nanoparticles (MNPs) prior to ICP-OES determination, has been developed. The morphological characteristic of the magnetic nanomaterial was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS), and X-ray diffractometer (XRD). Optimal experimental conditions including pH, adsorbent mass, and eluent acid concentration were found to be 3, 100mg and 5molL−1 HCl, respectively. The adsorption capacity of the MNPs of As was found to be 8.5mgg−1. Under optimum conditions, the analytical limits of detection (LOD) and limits of quantification (LOQ) were found to be 2.8 and 9.2μgL−1, respectively. The accuracy of the method was tested by analyzing certified wastewater (CWW-TM-D) and the recoveries were found to be greater than 90%. The method was successfully applied to the determination of trace amounts of As in river and tap water samples.
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