Microwave-assisted sample preparation in sequential injection: spectrophotometric determination of magnesium, calcium and iron in food

Oliveira, Celso Maran de; Sartini, Raquel P.; Zagatto, Elias A.G.

doi:10.1016/s0003-2670(00)00799-6

Cited by 27 publications

(10 citation statements)

References 11 publications

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“…Análises em vinho, 15,18,19,28,42,60 leite e sucos 19,22,25,30,42,68,74 são temas recorrentes: controlar o nível de determinadas substâncias é uma forma de garantir a qualidade e as características organolépticas dos alimentos, além de permitir o aprimoramento dos agroprodutos brasileiros, tornando-os ainda mais competitivos no mercado internacional. Um trabalho voltado ao desenvolvimento de software para SIA foi proposto por Neira et al, 28 em 2000, para a determinação de Fe em amostras de vinho branco.…”

Section: Características E Operaçãounclassified

A análise por injeção sequencial (SIA): vinte anos em uma perspectiva brasileira

Santos¹,

Masini²

2010

Quím. Nova

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Section: Características E Operaçãounclassified

A análise por injeção sequencial (SIA): vinte anos em uma perspectiva brasileira

Santos¹,

Masini²

2010

Quím. Nova

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“…7 This approach has been applied to the direct insertion of plant samples into flow systems by means of injection valves/ commutators [8][9][10] or selection valves. 11,12 The use of pinch valves for the same aim was reported in theoretical studies using model solutions 13 and a nitrogen flow to propel the slurry samples, 14 without application to real samples. Therefore, the purpose of this work was to explore the slurry sampling approach for automatic analysis of plant materials using a MSFIA manifold equipped with pinch valves.…”

Section: Introductionmentioning

confidence: 96%

Direct Introduction of Slurry Samples in Multi-syringe Flow Injection Analysis: Determination of Potassium in Plant Samples

et al. 2008

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The present work explores the slurry sampling approach for automatic, flow-based plant analysis. For this purpose, pinch valves were introduced into a multi-syringe flow injection analysis manifold to provide the repeatable aspiration of a few microliters of plant suspension before the material was further processed through the flow system. For validation of the proposed approach, the determination of potassium by flame emission spectrometry was implemented. Several parameters were studied: the concentration of plant particles in the sample suspension and the utilization of matrix modifiers. Microwave digestion was also implemented; no significant difference was found when certified reference material was analyzed with or without the in-line digestion step. The system was successfully applied to 13 samples within a concentration range of 2.5 to 100 mg g -1 . A determination frequency of 28 h -1 was achieved and the precision was better than 4.0% (n = 12).

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“…In order to make this possible, it was necessary to use only one wavelength, which was accomplished by using the same chromogenic reagent, cresolphtalein complexone (CPC), for both metals. 10 However, an appropriate choice of the masking agent had to be made to avoid mutual interference. 8-Hydroxyquinoline was used to complex magnesium 6 in the calcium determination, and EGTA was used to complex calcium 10 in the magnesium determination.…”

Section: Introductionmentioning

confidence: 99%

A Sequential Injection System for the Spectrophotometric Determination of Calcium, Magnesium and Alkalinity in Water Samples

Mesquita

Rangel

2004

ANAL. SCI.

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A sequential injection methodology for the spectrophotometric determination of calcium, magnesium and alkalinity in water samples is proposed. A single manifold is used for the determination of the three analytes, and the same protocol sequence allows the sequential determination of calcium and magnesium (the sum corresponds to the water hardness). The determination of both metals is based on their reaction with cresolphtalein complexone; mutual interference is minimized by using 8-hydroxyquinoline for the determination of calcium and ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA) for the determination of magnesium. Alkalinity determination is based on a reaction with acetic acid, and corresponding color change of Bromcresol Green. Working ranges of 0.5 -5 mg dm -3 for Ca, 0.5 -10 mg dm -3 for Mg, and 10 -100 mg HCO3 -dm -3 , for alkalinity have been achieved. The results for water samples were comparable to those of the reference methods and to a certified reference water sample. RSDs lower than 5% were obtained, a low reagent consumption and a reduced volume of effluent have been accomplished. The determination rate for calcium and magnesium is 80 h -1 , corresponding to 40 h -1 per element, while 65 determinations of alkalinity per hour could be carried out.

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Microwave-assisted sample preparation in sequential injection: spectrophotometric determination of magnesium, calcium and iron in food

Cited by 27 publications

References 11 publications

A análise por injeção sequencial (SIA): vinte anos em uma perspectiva brasileira

A análise por injeção sequencial (SIA): vinte anos em uma perspectiva brasileira

Direct Introduction of Slurry Samples in Multi-syringe Flow Injection Analysis: Determination of Potassium in Plant Samples

A Sequential Injection System for the Spectrophotometric Determination of Calcium, Magnesium and Alkalinity in Water Samples

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