Ribeiro MFT, Dias ACB, Santos JLM, Lima JLFC, Zagatto EAG. Fluidized beds in flow analysis: use with ion-exchange separation for spectrophotometric determination of zinc in plant digests.
Anal Bioanal Chem 2006;
384:1019-24. [PMID:
16408216 DOI:
10.1007/s00216-005-0257-5]
[Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2005] [Revised: 11/24/2005] [Accepted: 11/26/2005] [Indexed: 10/25/2022]
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.
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