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

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• 作者：Fagner Moreira de Oliveira ; Camila Marchioni ; Juan A. V de A. Barros ; Ayla Campos do Lago ; C茅lio Wisniewski ; Pedro Orival Luccas
• 关键词：Lake sediment ; Adsorption isotherm ; Cadmium ; Iron
• 刊名：Analytica Chimica Acta
• 出版年：27 January, 2014
• 年：2014
• 卷：809
• 期：Complete
• 页码：82-87
• 全文大小：1163 K

文摘

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 渭g L^鈭? for iron and 1.36 渭g L^鈭? for cadmium, and high sampling frequency for both metals 144 and 60 readings h^鈭? for iron and cadmium, respectively. Both metals obey the Langmuir model, with maximum adsorptive capacity of 0鈰?69 mg g^鈭? for iron and 7鈰?91 mg g^鈭? for cadmium. For iron, a pseudo-first-order kinetic model was obtained with a theoretical Q_e = 9鈰?355 mg g^鈭? (experimental Q_e = 9鈰?432 mg  g^鈭?), while for cadmium, a pseudo-second-order kinetic model was obtained, with a theoretical Q_e = 0.3123 mg g^鈭? (experimental Q_e = 0鈰?052 mg g^鈭?).