Journal ArticleDOI
Sample preparation methods for determination of Cd, Pb and Sn in meat samples by GFAAS: use of acid digestion associated with a cold finger apparatus versus solubilization methods
Eliézer Quadro Oreste,Richard Macedo de Oliveira,Adriane Medeiros Nunes,Mariana Antunes Vieira,Anderson Schwingel Ribeiro +4 more
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In this paper, three sample preparation methods for the determination of Cd, Pb and Sn in meat by Graphite Furnace Atomic Absorption Spectrometry (GFAAS): acid digestion, solubilization with tetramethylammonium hydroxide and formic acid.Abstract:
The aim of this study was to present three sample preparation methods for the determination of Cd, Pb and Sn in meat by Graphite Furnace Atomic Absorption Spectrometry (GFAAS): acid digestion, solubilization with tetramethylammonium hydroxide and formic acid. For the digestion with HNO3, a conventional open system with a cold finger was used. This system helped to avoid losses of analytes and reagents by volatilization, permitting to operate at high temperatures applied at a digester block and reducing the digestion time (∼1 h). Solubilizations were performed at room temperature. The slurry was left standing overnight and remained closed until achieving complete solubilization. The temperature program of the graphite furnace was optimized for each element in the different means of preparation samples using a mixture of Pd–Mg. The figures of merit were similar for all sample preparation methods evaluated. The limits of detection obtained for the acid digestion procedure were 0.0006, 0.0164 and 0.0520 μg g−1 for Cd, Pb and Sn, respectively. In order to evaluate the accuracy of the results obtained by the three sample preparation methods, recovery tests for four real meat samples were performed and the recoveries ranged from 93.7 to 109%, supporting the accuracy of the method. Also, different certified reference materials of meat were analyzed and the results obtained were in agreement with the certified value at 95% of confidence (t-test). The best results were obtained by the acid digestion procedure with the cold finger system. This procedure is faster, the system is semi-closed with no significant contamination or loss of analytes by volatilization and it provides a better signal/noise ratio.read more
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Analytical strategies of sample preparation for the determination of mercury in food matrices — A review
Sergio Luis Costa Ferreira,Valfredo Azevedo Lemos,Laiana O.B. Silva,Antônio Fernando de Souza Queiroz,Anderson Santos Souza,Erik Galvão Paranhos da Silva,Walter Nei Lopes dos Santos,Cesário Francisco das Virgens +7 more
TL;DR: In this article, the advantages, drawbacks and applications of the main techniques of sample preparation employed during the determinations of total mercury and methylmercury in food matrices employing analytical methods such as: cold vapor atomic absorption spectrometry (CV AAS) and atomic fluorescence spectrometer (AFS), inductively coupled plasma mass spectrometers (ICP-MS), voltammetry and neutron activation analysis.
Journal ArticleDOI
Evaluation of sample preparation methods for the determination of As, Cd, Pb, and Se in rice samples by GF AAS
Richard Macedo de Oliveira,Ana Clara Nascimento Antunes,Mariana Antunes Vieira,Aline Lisbôa Medina,Anderson Schwingel Ribeiro +4 more
TL;DR: In this article, a comparative evaluation of three different methods for sample preparation in rice for As, Cd, Pb, and Se determination by graphite furnace atomic absorption spectrometry (GF AAS) is presented.
Journal ArticleDOI
Synthesis and application of ion-imprinted polymer for extraction and pre-concentration of iron ions in environmental water and food samples.
TL;DR: XRD, FT-IR, SEM and nitrogen adsorption-desorption techniques have been used to characterization of prepared polymeric samples and FAAS technique was used to determination of Fe(III) ion in the foods and waters samples.
Journal ArticleDOI
Evaluation of Sample Preparation Methods for the Determination of Ca, Cu, Fe, K, and Na in Milk Powder Samples by ICP-OES
Eliézer Quadro Oreste,Alexander Ossanes de Souza,Camila Corrêa Pereira,Meibel Teixeira Lisboa,Mirla Cidade,Mirla Cidade,Mariana Antunes Vieira,Solange Cadore,Anderson Schwingel Ribeiro +8 more
TL;DR: In this paper, a comparative study between three acid decomposition procedures of milk powder samples for the determination of Ca, Cu, Fe, K, and Na by optical emission spectrometry with inductively coupled plasma is presented.
Journal ArticleDOI
Evaluation of the use of a reflux system for sample preparation of processed fruit juices and subsequent determination of Cr, Cu, K, Mg, Na, Pb and Zn by atomic spectrometry techniques.
Camila Corrêa Pereira,Alexander Ossanes de Souza,Eliézer Quadro Oreste,Mariana Antunes Vieira,Anderson Schwingel Ribeiro +4 more
TL;DR: The acid decomposition method was applied for the sample preparation of processed fruit juice and indicated the absence of Cr, Zn and Cu in the samples, except for Cu in strawberry juice.
References
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Journal ArticleDOI
Simple determination of tin in biological materials by atomic absorption spectrometry with a graphite furnace.
TL;DR: A simple and rapid determination of tin in biological materials by atomic absorption spectrometry (AAS) with a graphite furnace with the aim of suppressing interferences by direct addition of ascorbic acid in wet-ashed biological materials.
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Determination of Hg and Se in biological materials by chemical vapor generation electrothermal vaporization inductively coupled plasma mass spectrometry using isotope dilution calibration after microwave-assisted digestion with Aqua Regia
TL;DR: In this article, a method for the determination of Hg and Se in biological materials by chemical vapor generation electrothermal vaporization inductively coupled plasma mass spectrometry (CVG-ETV-ICP-MS) using isotope dilution calibration after acid digestion is proposed.
Journal ArticleDOI
Solubilização alcalina de peixes e otimização multivariada para determinação de chumbo e manganês usando espectrometria de absorção atômica com forno de grafite
Luciano de Almeida Pereira,Cláudia Carvalhinho Windmöller,José Bento Borba da Silva,Waldomiro Borges Neto +3 more
TL;DR: In this paper, the authors describe the development of methods for the determination of Pb and Mn in fishes by GF AAS after solubilization with tetramethylamonium hidroxide.