TITLE

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

AUTHOR(S)
Ribeiro, Marta F. T.; Dias, Ana C. B.; Santos, João L. M.; Lima, José L. F. C.; Zagatto, Elias A. G.
PUB. DATE
February 2006
SOURCE
Analytical & Bioanalytical Chemistry;Feb2006, Vol. 384 Issue 4, p1019
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
21909025

 

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