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

Ribeiro, Marta F. T.; Dias, Ana C. B.; Santos, João L. M.; Lima, José L. F. C.; Zagatto, Elias A. G.
February 2006
Analytical & Bioanalytical Chemistry;Feb2006, Vol. 384 Issue 4, p1019
Academic Journal
A novel strategy for utilization of solid reagents in flow analysis is proposed. Establishment of diffuse and reproducible geometry enables the solid particles to be maintained in constant floating, reflux, and circulating motion inside a mini-chamber. This is efficiently accomplished with pulsed flows, a characteristic of multi-pumping flow systems. Drawbacks inherent in solid-phase packed columns, for example backpressure, preferential pathways, swelling, etc., and some limitations inherent in immobilized reagents are minimised. Spectrophotometric determination of zinc in plants was selected as an application of the technique. Dowex 1-X8 anionic resin was kept freely inside a mini-chamber. Zinc chloro-complexes were adsorbed on the moving particles and derivatization with zincon was performed after elution. Analytical figures of merit and the potential and limitations of the approach are discussed.


Related Articles

  • The Kepler Problem in Rotating Reference Frames: Topological Study of the Phase Flow. Balsas, M. C.; Jiménez, E. S.; Vera, J. A. // AIP Conference Proceedings;12/26/2007, Vol. 963 Issue 2, p1146 

    This paper studies the topology of the phase flow of a Keplerian motion in a rotating reference frame, with help of some analytical and graphics tools. By means of Liouville-Arnold theorem and some specifics techniques, we obtained a complete topological classification of the phase flow...

  • Robustness in Regulatory Networks: A Multi-Disciplinary Approach. Jacques Demongeot; Adrien Elena; Sylvain Sené // Acta Biotheoretica;Jun2008, Vol. 56 Issue 1/2, p27 

    Abstract  We give in this paper indications about the dynamical impact (as phenotypic changes) coming from the main sources of perturbation in biological regulatory networks. First, we define the boundary of the interaction graph expressing the regulations between the main elements of the...

  • An orbit analysis approach to the study of superintegrable systems in the Euclidean plane. Adlam, C. M.; McLenaghan, R. G.; Smirnov, R. G. // Physics of Atomic Nuclei;Mar2007, Vol. 70 Issue 3, p486 

    We classify the superintegrable potentials in the Euclidean plane by means of an orbit analysis of the space of valence two Killing tensors under the action of the group of rigid motions. Our approach generalizes the classical approach of Winternitz and collaborators by considering pairs of...

  • Pattern formation in nonextensive thermodynamics: Selection criterion based on the Renyi entropy production. Cybulski, Olgierd; Matysiak, Daniel; Babin, Volodymyr; Holyst, Robert // Journal of Chemical Physics;5/1/2005, Vol. 122 Issue 17, p174105 

    We analyze a system of two different types of Brownian particles confined in a cubic box with periodic boundary conditions. Particles of different types annihilate when they come into close contact. The annihilation rate is matched by the birth rate, thus the total number of each kind of...

  • Effect of the excitation pulse frequency on the ultrafast photoinduced electron transfer dynamics. Fedunov, Roman G.; Ivanov, Anatoly I. // Journal of Chemical Physics;2/8/2005, Vol. 122 Issue 6, pN.PAG 

    The dependence of the ultrafast photoinduced electron transfer dynamics in donor-acceptor complexes on the excitation pulse carrier frequency (spectral effect) has been investigated in the framework of a model involving three electronic state. The spectral effect has been shown to strongly...

  • Classical geometry of matter in the state of fractional dimension. V. Klyucharev // Glass Physics & Chemistry;Dec2008, Vol. 34 Issue 6, p660 

    Abstract  Complementing Euclidean geometry by the notion of a point that is able to disappear and appear again makes it possible to describe the space of matter in the state of fractional dimension in the classical context and, thus, opens up new prospects in the development of...

  • On the geometry of nonholonomic mechanical systems with vertical distribution. Bejancu, Aurel // Journal of Mathematical Physics;May2007, Vol. 48 Issue 5, p052903 

    Let (Q,g) be the configuration space of a nonholonomic mechanical system, where g is a Riemannian metric on Q. Suppose the horizontal distribution D on Q admits a vertical distribution D, that is D is an integrable complementary (not necessarily...

  • Determination of rate constants for butene isomerization by a temporal inversion method. Genyuan Li; Rabitz, Herschel // Journal of Chemical Physics;8/22/1997, Vol. 107 Issue 8, p2845 

    Introduces a temporal inversion method for parameter identification of dynamical systems. Use of butene isomerization to illustrate the method; Determination of rate constants for chemical reaction systems; Development of an iterative algorithm; How accurate estimates of all rate constants can...

  • Disjoint Paths in the Plane. Liebling, TH. M.; Margot, F.; Muller, D.; Prodon, A.; Stauffer, L. // ORSA Journal on Computing;Winter95, Vol. 7 Issue 1, p84 

    Given n pairs of points in the Euclidean plane, we address the problem of finding paths of minimum length linking the pairs that can be made disjoint by infinitesimal deformations. We present and compare several fast heuristics and their implementation.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics