Graphite Furnace Atomic Absorption Spectrometry
Mostrando 13-24 de 70 artigos, teses e dissertações.
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13. Fast Determination of Iron and Zinc in Hair and Human Serum Samples After Alkaline Solubilization by GF AAS
Methods for the development and validation for determination of iron and zinc in human serum and hair samples by graphite furnace atomic absorption spectrometry (GF AAS) were performed. Solubilization was immediate by manual agitation in both samples with a 10 mL volume sample plus deionized water. Optimum pyrolysis and atomization temperatures were obtained
J. Braz. Chem. Soc.. Publicado em: 2016-01
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14. Determination of Cd, Ni and V in Spices by Solid Sampling High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry
This work describes a procedure for determination of Cd, Ni and V in spices by high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) using direct solid sampling (SS). The use of Pd/Mg(NO3)2 as modifier for Cd, and an additional air-assisted pyrolysis step allowed the use of aqueous calibration for all analytes. Accur
J. Braz. Chem. Soc.. Publicado em: 2015-10
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15. Determination of Essential, Non-Essential, and Potentially Toxic Elements in Graviola (Annona muricata L.) Pulp by ICP OES and GF AAS
The determination of essential (B, Ca, Co, Cu, Cr, Fe, K, Li, Mg, Mn, P, S, Se, Si, V, and Zn), non-essential (Al, Ba, Sn, Sr, and Ti), and potentially toxic (As, Cd, and Pb) elements in graviola pulp by inductively coupled plasma optical emission spectrometry (ICP OES) and graphite furnace atomic absorption spectrometry (GF AAS) is proposed. Samples were di
J. Braz. Chem. Soc.. Publicado em: 2015-10
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16. Chemical Speciation of Iron in Different Varieties of Beans (Phaseolus vulgaris L.): Cooking Effects
Beans are considered a source of iron (Fe), and hence have considerable contribution in cases of Fe deficiency. Beans also contain certain anti-nutritional constituents, which are imperative to the cooking of beans. The nutritional value of beans depends on the bioavailability, which can be affected by cooking. Studies about heating effects in distribution o
J. Braz. Chem. Soc.. Publicado em: 2015-10
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17. RAPID AND SENSITIVE DETERMINATION OF PALLADIUM USING HOMOGENEOUS LIQUID-LIQUID MICROEXTRACTION VIA FLOTATION ASSISTANCE FOLLOWED BY GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY
A method for the determination of trace amounts of palladium was developed using homogeneous liquid-liquid microextraction via flotation assistance (HLLME-FA) followed by graphite furnace atomic absorption spectrometry (GFAAS). Ammonium pyrrolidine dithiocarbamate (APDC) was used as a complexing agent. This was applied to determine palladium in three types o
Quím. Nova. Publicado em: 2015-05
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18. Metalloproteomic Profile Determination of Muscle Samples from Nile Tilapia (Oreochromis niloticus) Using AAS and ESI-MS/MS after 2D-PAGE Separation
This study evaluated the metalloproteomic profile of muscle tissue samples from Nile tilapia (Oreochromis niloticus). Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) methods was used for protein fractionation and identification based on image analysis. Determination of Ca, Cu, Fe, Mn and Zn was performed in the protein spots by flame and/or grap
J. Braz. Chem. Soc.. Publicado em: 2015-02
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19. DETERMINAÇÃO DE Cd E Pb EM AMOSTRAS DE GOMA XANTANA POR GF AAS
This paper describes the evaluation of a method for determination of Cd and Pb in xanthan gum samples by Graphite Furnace Atomic Absorption Spectrometry (GF AAS) using NH4H2PO4 as the chemical modifier. The sample preparation was performed using a reflux system adapted in the digestion tubes. With this system it was possible to increase the temperature of th
Quím. Nova. Publicado em: 2015-02
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20. Determination of Lead in Eye Shadow and Blush by High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry Employing Direct Solid Sampling
A espectrometria de absorção atômica em forno de grafite de alta resolução com fonte contínua (HR-CS GF AAS) é proposta para determinar Pb em sombra de olho e blush empregando a análise direta de sólidos. O emprego da mistura de modificadores químicos Pd(NO3)2 + Mg(NO3)2 possibilitou a cal
J. Braz. Chem. Soc.. Publicado em: 2015-01
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21. Chumbo e cádmio detectados em alimentos vegetais e gramíneas no município de Santo Amaro-Bahia
This study evaluated the level of the metals Pb mg kg-1 and Cd mg kg-1 found in plant species and the contribution of the levels detected in contaminated soils located in the urban area of the city of Santo Amaro, Bahia. Levels were determined by graphite furnace and flame atomic absorption spectrometry. The results showed the presence of Pb and Cd in plant
Quím. Nova. Publicado em: 2013
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22. DETERMINAÇÃO DE ELEMENTOS-TRAÇO EM BORRACHA NATURAL E DE SILICONE POR ESPECTROMETRIA DE ABSORÇÃO ATÔMICA COM FORNO DE GRAFITE COM AMOSTRAGEM DE SÓLIDOS / DETERMINATION OF TRACE-ELEMENTS IN NATURAL AND SILICONE RUBBER USING SOLID SAMPLING GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY
Neste trabalho foi proposto o uso da espectrometria de absorção atômica com forno de grafite com amostragem de sólidos para a determinação de Cr, Cu, Mn, Ni, Pb, Sb, Sn e Zn em borracha natural e Cr em borracha de silicone. A calibração foi realizada com soluções de referência. Para borracha natural, a correção de fundo foi realizada empregando
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/03/2012
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23. Effect of modifiers on thermal behaviours of se in acid digestates and slurries of vegetables by graphite furnace atomic absorption spectrometry.
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Food Chemistry. Publicado em: 2011
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24. Direct determination of Cu, Mn, Pb, Zn in beer by thermospray flame furnace atomic absorption spectrometry.
In this work, thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) was employed for Cu, Mn, Pb, and Zn determination in beer without any sample digestion. The system was optimized and calibration was based on the analyte addition technique. A sample volume of 300 Al was introduced into the hot Ni tube at a flow-rate of 0.4 ml min 1 using 0.14
Spectrochimica Acta Part B v. 60. Publicado em: 2011