Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/13223
Title: Influence of digestion methods on the recovery of iron, zinc, nickel, chromium, cadmium and lead contents in 11 organic residues
Other Titles: Influência de métodos de digestão na recuperação de teores de ferro, zinco, níquel, cromo, cádmio e chumbo em 11 resíduos orgânicos
Keywords: Heavy metals
Organic wastes
Waste products – Digestion – Methodology
Metais pesados
Resíduos orgânicos
Resíduos – Digestão – Metodologia
Issue Date: Jan-2014
Publisher: Sociedade Brasileira de Ciência do Solo
Citation: ABBRUZZINI, T. F. et al. Influence of digestion methods on the recovery of iron, zinc, nickel, chromium, cadmium and lead contents in 11 organic residues. Revista Brasileira de Ciência do Solo, Viçosa, MG, v. 38, n. 1, p. 166-176, jan./fev. 2014.
Abstract: There are currently many devices and techniques to quantify trace elements (TEs) in various matrices, but their efficacy is dependent on the digestion methods (DMs) employed in the opening of such matrices which, although "organic", present inorganic components which are difficult to solubilize. This study was carried out to evaluate the recovery of Fe, Zn, Cr, Ni, Cd and Pb contents in samples of composts and cattle, horse, chicken, quail, and swine manures, as well as in sewage sludges and peat. The DMs employed were acid digestion in microwaves with HNO3 (EPA 3051A); nitric-perchloric digestion with HNO3 + HClO4 in a digestion block (NP); dry ashing in a muffle furnace and solubilization of residual ash in nitric acid (MDA); digestion by using aqua regia solution (HCl:HNO3) in the digestion block (AR); and acid digestion with HCl and HNO3 + H2O2 (EPA 3050). The dry ashing method led to the greatest recovery of Cd in organic residues, but the EPA 3050 protocol can be an alternative method for the same purpose. The dry ashing should not be employed to determine the concentration of Cr, Fe, Ni, Pb and Zn in the residues. Higher Cr and Fe contents are recovered when NP and EPA 3050 are employed in the opening of organic matrices. For most of the residues analyzed, AR is the most effective method for recovering Ni. Microwave-assisted digestion methods (EPA3051 and 3050) led to the highest recovery of Pb. The choice of the DM that provides maximum recovery of Zn depends on the organic residue and trace element analyzed.
URI: http://repositorio.ufla.br/jspui/handle/1/13223
Appears in Collections:DCS - Artigos publicados em periódicos

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