Multielement Determination
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Sample Preparation Using TMAH and Nitric Acid for Multielement Determination in Crustacean Samples by MIP OES
This study proposes a simple sample preparation procedure using tetramethylammonium hydroxide (TMAH) and nitric acid (HNO3) to determine Cr, Cu, Fe, K, Mg, Mn, and Zn concentrations in shrimp (Macrobrachium amazonicum) and crab (Ucides cordatus) samples from the Amazon region by microwave-induced plasma optical emission spectrometry (MIP OES). The sample sol
J. Braz. Chem. Soc.. Publicado em: 2021-03
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2. SEQUENTIAL MULTI-ELEMENT DETERMINATION OF TRACE-METALS IN BIODIESEL SAMPLES USING HR-CS FAAS
In this work the feasibility of sequential multi-element determination of Zn, Fe, Mg, Cu, Na, K, Cr, Al and Ca in biodiesel samples by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was investigated. Biodiesel samples obtained from different sources and different chemical processes were analysed. The samples were diluted w
Quím. Nova. Publicado em: 2021-02
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3. Elemental Concentration and Sulfur Chemical Speciation in the Amazonian Plant Andira surinamensis Using Synchrotron Radiation Techniques (SR-XRF, XANES), RBS and WD-XRF
The inorganic composition of the bark and leaf of a plant from the Amazon rainforest, Andira surinamensis, was determined using two non-destructive, multi-element techniques: X-ray fluorescence (XRF) and Rutherford backscattering spectrometry (RBS). XRF measurements were made using both a conventional X-ray source and synchrotron radiation. It was observed t
J. Braz. Chem. Soc.. Publicado em: 16/09/2019
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4. Multielement Determination of Macro and Micro Contents in Medicinal Plants and Phytomedicines from Brazil by ICP OES
In this study, the elemental composition of nine medicinal plants and phytomedicines was evaluated by using axial view inductively coupled plasma optical emission spectrometry (ICP OES) after three digestion procedures: dry ashing (DA) and two wet digestions with a mineral acid (HNO3/H2O2) mixture on a conventional hot plate (CD), besides microwave digestion
J. Braz. Chem. Soc.. Publicado em: 2017-02
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5. An Evaluation of the Use of Formic Acid for Extraction of Trace Elements from Brazil Nut and Babassu Coconut and Its Suitability for Multi-Element Determination by ICP-MS
Formic acid extractions of Brazil nut and babassu coconut samples were undertaken prior to determination of Al, As, Ba, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Sr, V and Zn in their meat and oil portions by inductively coupled plasma mass spectrometry (ICP-MS) in an effort to accomplish a first order fractionation of the trace elements between these two components.
J. Braz. Chem. Soc.. Publicado em: 2016-06
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6. DEVELOPMENT OF A METHOD FOR MULTIELEMENTAL DETERMINATION IN BIODIESEL BY ICP-MS / DESENVOLVIMENTO DE MÉTODO PARA DETERMINAÇÃO MULTIELEMENTAR EM BIODIESEL POR ICP-MS
Biodiesel appeared in this scenario as an alternative short-term, compatible with the current technologies and without the necessity of major modifications. The elements of greatest interest are the residue of catalyst of the production process (Na, K), those limited by environmental regulations (S) and those that act like poisons for the catalyst system of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2011
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7. Discriminação de alface orgânicas e convencionais usando determinação elementar e métodos quimiométricos / Discrimination of organic and conventional lettuce using elemental determination and chemometrics methods
Alimentos como os vegetais podem ser cultivados de diferentes maneiras (orgânica, convencional e hidropônica). Na era dos agrotóxicos cresce a procura pelos alimentos orgânicos, os quais são cultivados em terra fértil sem uso de fertilizantes químicos inorgânicos ou produtos agrotóxicos. Uma vez que esses alimentos orgânicos necessitam de um cultiv
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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8. Determination of copper, iron, lead and zinc in gasoline by sequential multi-element flame atomic absorption spectrometry after solid phase extraction
Desenvolveu-se um procedimento para determinação de cobre, ferro, chumbo e zinco em amostras de gasolina. O procedimento foi baseado na pré-concentração dos metais empregando uma resina modificada com o ácido 3,4-dihidroxibenzóico (XAD-DHB), seguida da dessorção com solução ácida. Os analitos no eluato foram determinados por espectrometria de abs
Journal of the Brazilian Chemical Society. Publicado em: 2011-03
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9. Multivariate Analysis of ICP OES Calibration Conditions for Sequential Extraction of Metals Ions.
Sequential extraction procedures are normally applied to evaluate sediments, soils and plants. The reagents are often selected with the intention that they should target well-defined minerals phases although specíficity cannot be guaranteed. Inductively coupled plasma aptical emission spectrometry (ICP OES) is an instrumental technique that can be used for
EURO ANALYSIS. Publicado em: 2011
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10. Qualidade ambiental de solos agrícolas da bacia do Rio Jaguari -São Paulo / ENVIRONMENTAL QUALITY OF AGRICULTURAL SOILS WITHIN THE JAGUARI RIVER BASIN - SÃO PAULO
Environmental impacts have occurred in various forms and intensities on soil, water and air media. Consequently, several countries have used legal criteria for soil protection, either by means of generic guiding values or through case-by-case risk assessment. The São Paulo Environmental Agency (CETESB) pioneered the publication of guiding values for soils a
Publicado em: 2009
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11. DETERMINAÇÃO DE ELEMENTOS MENORES E TRAÇO EM ROCHAS POR LA-ICPMS: PROGRESSOS NA UTILIZAÇÃO DE VIDROS BORATOS COMO ALVOS / DETERMINATION OF MINOR AND TRACE ELEMENTS IN ROCK SAMPLES BY LA-ICPMS: PROGRESS IN THE UTILIZATION OF BORATE GLASSES AS TARGETS
The present master dissertation is a continuation of a research study developed by Leite (2006) aiming at the multielemental analysis of rock samples (basalts, obsidians and shale) by inductively coupled plasma mass spectrometry (ICPMS), in combination with laser ablation (LA) and using borate glass as analytical targets. As in the former work, the experimen
Publicado em: 2009
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12. Espectrometria de absorção atômica: o caminho para determinações multi-elementares
This paper present an overview of way covered for the spectrometry of atomic absorption (AAS), tracing a line of the historical events in its development and its establishment as a multielement technique. Additionally, the efforts carried by through several researchers in the search for the instrumental evolution, the advances, advantages, limitations, and t
Química Nova. Publicado em: 2008