title: Assessment of cadmium and iron adsorption in sediment, employing a flow injection analysis system with on line filtration and detection by flame atomic absorption spectrometry and thermospray flame furnace atomic absorption spectrometry.
abstract: This work presents an evaluation of iron and cadmium adsorption in sediment of the Furnas Hydroelectric Plant Reservatory located in Alfenas, Minas Gerais (Brazil). The metal determination was done employing a flow injection analysis (FIA) with an on-line filtering system. As detection techniques, flame atomic absorption spectrometry (FAAS) for iron and thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) for cadmium determinations were used. The developed methodology presented good limits of detection, being 190 μg L(-1) for iron and 1.36 μg L(-1) for cadmium, and high sampling frequency for both metals 144 and 60 readings h(-1) for iron and cadmium, respectively. Both metals obey the Langmuir model, with maximum adsorptive capacity of 0⋅169 mg g(-1) for iron and 7⋅991 mg g(-1) for cadmium. For iron, a pseudo-first-order kinetic model was obtained with a theoretical Q(e)=9⋅8355 mg g(-1) (experimental Q(e)=9⋅5432 mg g(-1)), while for cadmium, a pseudo-second-order kinetic model was obtained, with a theoretical Q(e)=0.3123 mg g(-1) (experimental Q(e)=0⋅3052 mg g(-1)).
authors.affiliation: Universidade Federal de Alfenas (UNIFAL-MG), Instituto de Química, Rua GabrielMonteiro da Silva, 714, CEP 37130-000, Alfenas-MG, Brazil.
authors.forename: Fagner Moreira
authors.initials: FM
authors.lastname: de Oliveira
authors.affiliation: Universidade Federal de Alfenas (UNIFAL-MG), Instituto de Química, Rua GabrielMonteiro da Silva, 714, CEP 37130-000, Alfenas-MG, Brazil.
authors.forename: Camila
authors.initials: C
authors.lastname: Marchioni
authors.affiliation: Universidade Federal de Alfenas (UNIFAL-MG), Instituto de Química, Rua GabrielMonteiro da Silva, 714, CEP 37130-000, Alfenas-MG, Brazil.
authors.forename: Juan A V de A
authors.initials: JA
authors.lastname: Barros
authors.affiliation: Universidade Federal de São Carlos (UFSCar-SP), Departamento de Química, 10Rodovia Washington Luís, Km 235-SP 310, CEP 16565-905, São Carlos-SP, Brazil.
authors.forename: Ayla Campos
authors.initials: AC
authors.lastname: do Lago
authors.affiliation: Universidade Federal de Alfenas (UNIFAL-MG), Instituto de Química, Rua GabrielMonteiro da Silva, 714, CEP 37130-000, Alfenas-MG, Brazil.
authors.forename: Célio
authors.initials: C
authors.lastname: Wisniewski
authors.affiliation: Universidade Federal de Alfenas (UNIFAL-MG), Instituto de Química, Rua GabrielMonteiro da Silva, 714, CEP 37130-000, Alfenas-MG, Brazil. Electronic address: pedro.luccas@unifal-mg.edu.br.
authors.forename: Pedro Orival
authors.initials: PO
authors.lastname: Luccas
keywords: Adsorption isotherm; Cadmium; Iron; Lake sediment