Paper Title
EXTRACTION, PRECONCENTRATION AND DETERMINATION OF ARSENIC IN DRINKING WATER BY HR ETAAS

Abstract
Heavy metals, such as arsenic, are highly relevant environmental contaminants with significant adverse effects on human health and ecosystems. Arsenic, in its various chemical forms, is widely distributed due to industrial and agricultural activities. Its toxicity affects numerous organs and is associated with increased incidence of various cancers.Precise determination of arsenic in drinking water is therefore crucial. Several techniques exist for detecting and quantifying arsenic, including ICP-MS (inductively coupled plasma mass spectrometry) and ETAAS (graphite furnace atomic absorption spectrometry), which offer high sensitivity and accuracy. To improve the analytical performance of these techniques, we propose the use of a novel adsorbent based on functionalized magnetic nanoparticles (M@GOY) for magnetic solid-phase extraction (MSPE). This technique is promising due to its advantages in speed, selectivity, and preconcentration capacity. In this study, the synthesized material was characterized, and various analytical parameters were optimized, including pH, loading, elution and reducing agent flow rates, as well as eluent and reducing agent concentrations, among others. The optimized method achieved detection limits (LOD) of 0.10 µg L-1 and quantification limits (LOQ) of 0.18 µg L-1. Relative standard deviations (%RSD) obtained ranged from 1-5%. Finally, standard reference materials were analyzed to validate the method, yielding a good correlation between the obtained results and certified values. Keywords - Arsenic, Magnetic Solid Phase Extraction, Magnetic Nanoparticles, Graphene Oxide, Hydride Generation, Graphite Furnace Atomic Absorption Spectroscopy.