An on-line system using ion-imprinted polymer for preconcentration and determination of bismuth in seawater employing atomic fluorescence spectrometry

Caio S A Felix; Darllen G Silva; Heloysa M C Andrade; Valeria B Riatto; Mauricio M Victor; Sergio L C Ferreira

doi:10.1016/j.talanta.2018.02.089

An on-line system using ion-imprinted polymer for preconcentration and determination of bismuth in seawater employing atomic fluorescence spectrometry

Talanta. 2018 Jul 1:184:87-92. doi: 10.1016/j.talanta.2018.02.089. Epub 2018 Feb 26.

Authors

Caio S A Felix¹, Darllen G Silva¹, Heloysa M C Andrade¹, Valeria B Riatto¹, Mauricio M Victor¹, Sergio L C Ferreira²

Affiliations

¹ Universidade Federal da Bahia, Instituto de Química, Programa de Pós-Graduação em Química, Campus Ondina, 40170-115, Salvador, Bahia, Brazil; Instituto Nacional de Ciência e Tecnologia de Energia e Ambiente, Universidade Federal da Bahia, 40170-115 Salvador, Bahia, Brazil.
² Universidade Federal da Bahia, Instituto de Química, Programa de Pós-Graduação em Química, Campus Ondina, 40170-115, Salvador, Bahia, Brazil; Instituto Nacional de Ciência e Tecnologia de Energia e Ambiente, Universidade Federal da Bahia, 40170-115 Salvador, Bahia, Brazil. Electronic address: slcf@ufba.br.

PMID: 29674087
DOI: 10.1016/j.talanta.2018.02.089

Abstract

This work proposes an on-line preconcentration system using ion-imprinted polymer (IIP) for determination of bismuth in seawater employing atomic fluorescence spectrometry (AFS). The polymer was synthesized using 2- (5-bromo-2-pyridylazo) -5-diethylaminophenol (Br-PADAP) for complex formation, ethylene glycol dimethacrylate (EGDMA), cross-linking reagent and methacrylic acid (AMA) reagents, used as the functional monomer, 2,2-azobisisobutyronitrile was used as the radical initiator. The polymer was characterized employing the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The determination of bismuth was performed employing hydride generation atomic fluorescence spectrometry (HG AFS) and the experimental conditions were optimized using a Box Behnken design involving the factors sample pH, eluent concentration and sodium tetrahydroborate concentration. So, using the optimized conditions the system allows the determination of bismuth with limits of detection and quantification of 26 and 88 ng L^-1, a preconcentration factor of 19.8. All these parameters were determined using a sample volume of 25 mL. The precision expressed as relative standard deviation (RSD%) was 3.7% for a bismuth(III) solution of concentration 0.25 µg L^-1. The system proposed was applied for the determination of bismuth in four seawater samples collected in Salvador City, Bahia State, Brazil. The concentrations obtained varied from 0.38 to 0.45 μg L^-1. The accuracy was evaluated by addition/recovery test, and the recoveries found varied from 92% to 101%.

Keywords: AFS; Bismuth; Box-Behnken design; Ion-imprinted polymer; Seawater.