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Type: Artigo
Title: Performance of avocado seed activated carbon as adsorbent for highly sensitive determination of cd using a flow injection system online coupled to TS-FF-AAS
Author: Kudo, Marianne V. F.
de Oliveira, Leandro L. G.
Suquila, Fabio A. C.
de Almeida, Fernanda G.
Segatelli, Mariana G.
Lima, Eder C.
Dias, Silvio L. P.
Tarley, Cesar R. T.
Abstract: A flow-injection preconcentration system using detection by the thermospray flame furnace atomic absorption spectrometry (FIA-TS-FF-AAS) is proposed. Cd2+ are adsorbed on avocado seed activated carbon (ASAC) packed into a cylindrical mini-column and eluted using HCl solutions for the detection system. A 2(5) - 1 fractional factorial and Doehlert matrix design were employed to determine the optimum conditions for cadmium preconcentration (pH 7.68, buffer concentration (Tris/Tris-HCl) of 0.023 mol L-1, eluent concentration (HCl) of 2.0 mol L-1, the adsorbent mass of 100.0 mg and preconcentration flow rate of 4.8 mL min(-1)). The preconcentration method presents linearity within the range of 0.41-15.00 mu g L-1, limits of quantification and detection of 0.41 and 0.12 mu g L-1, respectively, preconcentration factor of 10.7, consumption of index of 0.93 mL and sample throughput of 26 h(-1). The precision assessed as the relative standard deviation (RSD) were found to be 0.48, 0.90 and 2.30% for inter-day precision (n = 2), and 0.30, 0.44 and 2.48% for intra-day precision (n = 6) for respective cadmium concentration of 0.50, 5.00 and 15.00 mu g L-1. The proposed method was applied satisfactorily in samples of cigarette (62.84 +/- 11.28 mu g kg(-1)), human hair (69.61 +/- 2.38 mu g kg(-1)) and water samples [lake (0.65 +/- 0.01 mu g L-1), tap and mineral]
Subject: TS-FF-AAS
Carbono ativado
Country: Brasil
Editor: Sociedade Brasileira de Química
Rights: Aberto
Identifier DOI: 10.21577/0103-5053.20190132
Date Issue: 2020
Appears in Collections:IQ - Artigos e Outros Documentos

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