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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Sequential injections as an alternative to gradient exploitation for implementing differential kinetic analysis in a flow injection system

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Author(s):
Fortes, Paula R. [1] ; Feres, Mario A. [1] ; Zagatto, Elias A. G. [1] ; Lima, Jose L. F. C. [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13400970 Piracicaba - Brazil
[2] Univ Porto, REQUIMTE, Fac Farm, P-4099030 Oporto - Portugal
Total Affiliations: 2
Document type: Journal article
Source: Talanta; v. 81, n. 4-5, p. 1409-1412, JUN 15 2010.
Web of Science Citations: 7
Abstract

A novel flow-based strategy for implementing simultaneous determinations of different chemical species reacting with the same reagent(s) at different rates is proposed and applied to the spectrophotometric catalytic determination of iron and vanadium in Fe-V alloys. The method relies on the influence of Fe(II) and V(IV) on the rate of the iodide oxidation by Cr(VI) under acidic conditions, the Jones reducing agent is then needed Three different plugs of the sample are sequentially inserted into an acidic KI reagent carrier stream, and a confluent Cr(VI) solution is added downstream Overlap between the inserted plugs leads to a complex sample zone with several regions of maximal and minimal absorbance values. Measurements performed on these regions reveal the different degrees of reaction development and tend to be more precise Data are treated by multivariate calibration involving the PLS algorithm The proposed system is very simple and rugged Two latent variables carried out ca 95% of the analytical information and the results are in agreement with ICP-OES. (C) 2010 Elsevier B V. All rights reserved. (AU)

FAPESP's process: 06/07309-3 - Novel analytical strategies for studies involving biomolecules
Grantee:Elias Ayres Guidetti Zagatto
Support type: Research Projects - Thematic Grants
FAPESP's process: 06/03859-9 - Development of analytical flow systems exploiting feedback mechanisms, improved conditions for detection and/or multivariate calibration: application to agro-industrial or environmental samples
Grantee:Paula Regina Fortes
Support type: Scholarships in Brazil - Doctorate