Development of a novel direct magnetic sorbent sampling device by flame furnace atomic absorption spectrometry (DMSS-FF-AAS) using a carbonaceous nanocomposite for highly sensitive determination of cadmium

Author(s)

dos Santos, Paula Mantovani ; Carneiro, Ana Carla Ranucci ; Costa, Lucimara Mendonca ; Ferreira, Odair Pastor ; Soares Junior, Francisco Holanda ; Soares, Joao Maria ; Vieira, Lais Helena Sousa ; de Figueiredo, Eduardo Costa ; Corazza, Marcela Zanetti ; Tarley, Cesar Ricardo Teixeira

• Document type: Journal article
• Source: Journal of Analytical Atomic Spectrometry; v. 38, n. 2, p. 10-pg., 2022-12-07.

Abstract

A novel and highly sensitive method for cadmium determination at ultratrace levels combining dispersive magnetic solid phase extraction (DMSPE), direct magnetic sorbent sampling (DMSS), and flame furnace atomic absorption spectrometry (FF-AAS) is described in this work. A magnetic carbon-based nanocomposite (Fe3O4@C) was used as the sorbent for cadmium preconcentration using DMSPE. The Fe3O4@C particles were easily separated from the aqueous medium by employing a magnetic stainless steel rod and directly inserting it inside a nickel tube heated by a flame. The method (DMSS-FF-AAS) showed substantially higher analytical performance when compared to FAAS, TS-FF-AAS (direct analysis), and TS-FF-AAS using preconcentration and elution steps, evidenced by a remarkable increase in the sensitivity of 2502, 151 and 41 times, respectively. Under the optimized conditions, the limit of detection, linearity, and the precision in terms of repeatability (n = 10) assessed as the relative standard deviation (RSD%) were found to be 5 ng L-1, 15-750 ng L-1, and 1-4%, respectively. The accuracy of the method was attested by analysis of certified reference materials, CRM-1643e (water) and CRM-1573a (tomato leaves). The proposed method was successfully applied for cadmium determination in mineral and lake water samples ranging from 16 to 465 ng L-1. (AU)

• FAPESP's process: 14/50867-3 - INCT 2014: National Institute of Science and Technology in Bioanalysis
• Grantee: Marco Aurelio Zezzi Arruda
• Support Opportunities: Research Projects - Thematic Grants