Fluidized beds in flow analysis: use with ion-exchange separation for spectrophotometric determination of zinc in plant digests

Ribeiro, Marta F. T.; Dias, Ana Cristi Basile; Santos, João L.M.; Lima, José L.F.C.; Zagatto, Elias A.G.

doi:10.1007/s00216-005-0257-5

Cited by 34 publications

(6 citation statements)

References 35 publications

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“…During long-time utilization, preferential pathways may be established inside the minicolumn, limiting the interaction of the sample with the sorbent. These aspects can be circumvented by exploiting functionalized moving beads and the number of applications of this approach has increased, especially in the context of bead injection analysis (Ruzicka and Scampavia 1999), including lab-on-valve (Boonjob 2014)), MSFIA (Pons et al 2005), SIA (Wang and Hansen 2001, Sartini et al 2002, magnetic beads (Ampan et al 2002), and fluidized beds (Ribeiro et al 2006).…”

Section: Manifold Designmentioning

confidence: 99%

“…Fluidized beds refer to conversion of a solid granular material from a static to a dynamic fluidlike state, establishing a chaotic but reproducible 4π geometry, aiming at improving the solid/liquid interaction. In flow analysis, fluidization can be attained by placing the solid material inside a vertical tubular chamber and letting a pulsed liquid stream to pass through it (Ribeiro et al 2006), as show in Fig. 2b.…”

Section: Fluidized Bedsmentioning

confidence: 99%

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Solid-phase extractions in flow analysis

Rocha

Batista

Melchert

2018

An. Acad. Bras. Ciênc.

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Coupling solid-phase extraction (SPE) to flow systems has promoted a synergistic development. Whereas SPE mechanization leads to improved precision and higher sample throughput, as well as diminishes systematic errors and contamination risks, analyte concentration and separation from the sample matrix provides a remarkable impact on detectability and selectivity in flow analysis. Historical aspects, main cornerstones, tips for system design, and recent applications are critically reviewed, in the context of analyte(s) separation/concentration, sample clean-up, and release of sorbed chemical species involving both packed (e.g. mini-columns, cartridges, and disks) or fluidized (e.g. beads and magnetic materials) particles. Novel (bio)sorbents, selective synthetic materials, and stationary phases for low-pressure chromatography are also discussed. Moreover, the feasibility of SPE for sample treatment before chromatographic separation, as well as the exploitation of direct measurements on the solid phase (optosensing) are emphasized.

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Section: Manifold Designmentioning

confidence: 99%

Section: Fluidized Bedsmentioning

confidence: 99%

Solid-phase extractions in flow analysis

Rocha

Batista

Melchert

2018

An. Acad. Bras. Ciênc.

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“…ion-exchange resins, C 18 immobilized on silica, polyurethane foams, PTFE turnings, extracting disks, monolithic columns and molecularly imprinted polymers" [58]. A pre-selected sample volume is allowed to pass through the mini-column and the species of interest are retained; after optional column washing, the retained species are eluted towards detection.…”

Section: Analyte Separation/concentrationmentioning

confidence: 99%

Multi-commutation in flow analysis: Recent developments and applications

Feres¹,

Fortes²,

Zagatto³

et al. 2008

Analytica Chimica Acta

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“…Pulsed flows have been exploited for attaining improved mixing conditions [4], enhanced radial mass transport thus lower sample broadening [5] and efficient management of solid reagents (fluidized beds) [6]. However, its usefulness in respect to heating of the reaction medium was not yet demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Pulsed Flows for Heating Improvement: Application to Determination of Total Reducing Sugars in Molasses and Sugar-Cane Juices

Alves¹,

Feres²,

Zagatto³

et al. 2009

CAC

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Laminar and pulsed flows typical of multi-commuted and multi-pumping flow systems, were evaluated in relation to analytical procedures carried out at high temperatures. As application, the spectrophotometric determination of total reducing sugars (TRS, hydrolyzed sucrose plus reducing sugars) in sugar-cane juice and molasses was selected. The method involves in-line hydrolysis of sucrose and alkaline degradation of the reducing sugars at about 98 o C. Better results were obtained with pulsed flows, due to the efficient radial mass transport inherent to the multi-pumping flow system.The proposed system presents favorable characteristics of ruggedness, analytical precision (r.s.d. < 0.013 for typical samples), stability (no measurable baseline drift during 4-h working periods), linearity of the analytical curve (r > 0.992, n = 5, 0.05 -0.50% w/v TRS) and sampling rate (65 h -1 ). Results are in agreement with ion chromatography.

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Fluidized beds in flow analysis: use with ion-exchange separation for spectrophotometric determination of zinc in plant digests

Cited by 34 publications

References 35 publications

Solid-phase extractions in flow analysis

Solid-phase extractions in flow analysis

Multi-commutation in flow analysis: Recent developments and applications

Exploiting Pulsed Flows for Heating Improvement: Application to Determination of Total Reducing Sugars in Molasses and Sugar-Cane Juices

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