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

Autor(es)

Kudo, Marianne V. F. ^[1] ; de Oliveira, Leandro L. G. ^[1] ; Suquila, Fabio A. C. ^[1] ; de Almeida, Fernanda G. ^[1] ; Segatelli, Mariana G. ^[1] ; Lima, Eder C. ^[2] ; Dias, Silvio L. P. ^[2] ; Tarley, Cesar R. T. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Londrina, Dept Quim, BR-86051990 Londrina, Parana - Brazil

^[2] Univ Fed Rio Grande do Sul, Inst Quim, BR-90040060 Porto Alegre, RS - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Inst Quim, Inst Nacl Ciencia & Tecnol Bioanalit INCTBio, Dept, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 31, n. 1, p. 100-108, JAN 2020.
• Citações Web of Science: 0

Resumo

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 25–1 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 µg L-1, limits of quantification and detection of 0.41 and 0.12 µg 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 µg L-1. The proposed method was applied satisfactorily in samples of cigarette (62.84 ± 11.28 µg kg-1), human hair (69.61 ± 2.38 µg kg-1) and water samples [lake (0.65 ± 0.01 µg L-1), tap and mineral]. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático