Evaluation of the analytical performance of a solid phase magnetic extraction method for Pb2+determination

Considering the relevant daily exposure and danger of lead ians, the development of methodologies capable of determining this ion at low concentrations in different matrices becomes essential1. Several spectroscopic techniques allow this detection, however, dueto sensitivity-related problems, a preconcentration step can be made necessary. Magnetic solid phase magnetic extraction (MSPE) is a preconcentration technique based on the use of magnetic particles such as adsorbentes2 . lron oxide nanoparticles (Fe3Q4) are promising and, in this work, have been synthesized by the coprecipitation method, characterized and applied as an adsorber for Pb2+ ians by MSPE and detection by FAAS. 3.0 mg of Fe3Q4 were maintained under vortex agitation for 4 minutes with Pb2+ solutions [1 mg L-1] and pH 9.0. Subsequently, magnetic separation and elution was carried out by the addition of 0.5 ml of HN03 0.5 mal L-1 for 2 minutes. After a new magnetic separation, the supernatant was analyzed by FAAS. The synthesized material was characterized by X-ray diffraction (Figure 1 ), observing that adsorption does not cause displacement in diffraction spikes, indicating that the material maintains its crystallographic structure and magnetism after adsorption. The detection and quantification limits obtained of 5.44 and 16.4 μg L-1 respectively, R.S.0(%) of 4% anda preconcentration factor of 135 were obtained. indicating that the magnetite nanoparticles behave as a promising material in the development of a new methodology for determining Pb2+ ians.