Optimisation of tin determination in aqua regia–HF extracts from sediments by electrothermal atomic absorption spectrometry using experimental design

Arambarri, I.; Garcı́a, Rosa; Millán, Esmeralda

doi:10.1039/b005846g

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…The comparison of the analytical results of the method described above with the results of the determination of molybdenum by atomic emission spectrometry with induced plasma source (ICP-AES) used as control method (Table 7), and the results reported in the literature, [24][25][26] shows good agreement and indicates that the proposed method may be adequate for the determination of traces of molybdenum in soil and plant samples.…”

Section: Analytical Applicationmentioning

confidence: 63%

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Carvalho

Reis

et al. 2020

J. Braz. Chem. Soc.

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The method is based on the adsorptive accumulation of complex molybdenum(VI) with 8-hydroxyquinoline, using voltammetric square wave cathodic stripping voltammetry. The composition and concentration of the supporting electrolyte, frequency (Hz), amplitude (mV) and deposition time (s), were optimized by factorial design in relation to current reduction of molybdenum(VI). The optimum methodology provided the following values for the process variables: scan increase (0.5 mV), pulse amplitude (127 mV), frequency (96 Hz), adsorption time (80 s) and drop size (0.60 mm 2), the concentration of KNO 3 (2.0 mol L-1), acetate buffer (0.5 mol L-1) and 8-hydroxyquinoline (0.01 mol L-1). The results obtained after optimization showed a linear response in the range from 1.0 to 6.0 mg L-1 and limits of detection and quantification, respectively equal to 0.02 and 0.08 mg L-1. The molybdenum contained in the samples were determined using the optimized methodology, with values consistent with the values determined by atomic emission spectrometry with inductively coupled plasma (ICP-AES).

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Section: Analytical Applicationmentioning

confidence: 63%

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Carvalho

Reis

et al. 2020

J. Braz. Chem. Soc.

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“…Será descrito o planejamento fatorial completo com ponto central utilizado por Arambarri et al 31 . Os autores tinham como objetivo aprimorar a determinação analítica de estanho (Sn) total em solução ácida de sedimentos após digestão.…”

Section: Exemplo 1: Planejamento Fatorial Completounclassified

Quimiometria II: planilhas eletrônicas para cálculos de planejamentos experimentais, um tutorial

Teófilo¹,

Ferreira²

2006

Quím. Nova

240

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Recebido em 10/12/04; aceito em 20/5/05; publicado na web em 8/12/05 CHEMOMETRICS II: SPREADSHEETS FOR EXPERIMENTAL DESIGN CALCULATIONS, A TUTORIAL. This work describes, through examples, a simple way to carry out experimental design calculations applying an spreadsheets. The aim of this tutorial is to introduce an alternative to sophisticated commercial programs that normally are too complex in data input and output. An overview of the principal methods is also briefly presented. The spreadsheets are suitable to handle different types of computations such as screening procedures applying factorial design and the optimization procedure based on response surface methodology. Furthermore, the spreadsheets are sufficiently versatile to be adapted to specific experimental designs.Keywords: spreadsheets; experimental design; chemometrics. INTRODUÇÃOAtualmente, com o advento acelerado dos meios computacionais, cálculos muitas vezes simples podem ficar mascarados quando realizados por pacotes computacionais complexos. Os planejamentos fatoriais [1][2][3] , por ex., exigem após sua execução, cálculos simples, mas muitas vezes tediosos devido à grande quantidade de dados a serem processados. A maioria dos estudantes e profissionais aprende a utilizar softwares que realizam tais cálculos, entretanto, em muitos casos, sem o interesse e estímulo necessários para entender como os mesmos são processados.A importância do entendimento dos procedimentos realizados pelos softwares é fundamental para avaliação dos resultados obtidos, bem como para o questionamento da maneira pelo qual tais softwares os realizam.Há no mercado diversos tipos de softwares que realizam cálcu-los de planejamentos experimentais, tais como Statistica 4 , Unscrambler 5 , Statgraphics 6 , Design Expert 7 , Modde 8 , Minitab 9 dentre outros. Entre os programas gratuitos destaca-se o pacote de algoritmos executáveis disponível no web site Chemkeys 10 , sendo este até o momento, o único gratuito em português. Nota-se, portanto, que a maioria destes programas não são gratuitos e muitas vezes processam resultados complicados de serem entendidos por um pesquisador inexperiente. Ao contrário, as planilhas eletrôni-cas, já bastante difundidas e conhecidas, são práticas no sentido da entrada de dados e equações, além de proporcionarem excelente visualização dos resultados, fácil transferência de dados, gráficos e tabelas, sendo ferramentas poderosas para implementar e realizar diferentes tipos de cálculos, como os de planejamentos experimentais. É válido destacar que existem versões gratuitas disponí-veis na web tanto para sistemas operacionais Windows quanto para Linux, como a encontrada no pacote Openoffice 11 . O objetivo deste trabalho foi desenvolver, de maneira simples e didática, planilhas eletrônicas utilizando-se o software Excel ® da Microsoft 12 para realizar cálculos de planejamentos fatoriais e otimização empregando Metodologias de Superfície de Resposta (RSM). Desta maneira, o trabalho descreve, de modo amplo e objetivo, os métodos implementados empre...

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“…The same research group has published methods based on ETV-AAS for the quantification of Co, Cu, Pb and Ni in gypsum 335 and Tl in some sulfide minerals. 484 Arambarri and colleagues 485 sought to improve the determination of Sn in aqua regia-HF digests of sediments by ETV-AAS with palladium as the chemical modifier. They estimated the influence of various parameters and optimised the significant ones, i.e.…”

Section: Instrumental Analysismentioning

confidence: 99%

Atomic spectrometry update. Environmental analysis

Hill

Arowolo

Butler

et al. 2002

J. Anal. At. Spectrom.

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This is the twentieth annual review published in JAAS of the application of atomic spectrometry to the chemical analysis of environmental samples. In the analysis of air, there is ongoing development of instrumentation for continuous emission monitoring and as a means of interrogating the composition of individual airborne particulates. Developments in mass spectrometry applications continue to be an active area of research where the advantages of low detection limits and abilities to perform isotopic measurements are being exploited. There is growing interest in performing speciation measurements in water and this is being aided by the development of hyphenated techniques, most notably via the coupling of chromatographic systems to ICP-MS. Dominant themes in the analysis of soils include the optimization of preconcentration (and matrix separation) techniques, development of speciation protocols, notably arsenic and the increased use of portable XRF systems for in situ analysis. In geological analysis, laser ablation as an analytical tool is attracting a wider audience. Multi-collector ICP-MS is increasingly being used in a number of geological facilities to perform high precision isotope ratio measurements.

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Optimisation of tin determination in aqua regia–HF extracts from sediments by electrothermal atomic absorption spectrometry using experimental design

Cited by 15 publications

References 20 publications

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Quimiometria II: planilhas eletrônicas para cálculos de planejamentos experimentais, um tutorial

Atomic spectrometry update. Environmental analysis

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