Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Zone trapping/merging zones in flow analysis: A novel approach for rapid assays involving relatively slow chemical reactions

Full text
Author(s):
Vida, Ana C. F. [1] ; Sasaki, Milton K. [1] ; Gomes, Taciana F. [1] ; Silva, Claudineia R. [1] ; Feres, Mario A. [1] ; Zagatto, E. A. G. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13400970 Piracicaba - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Talanta; v. 85, n. 1, p. 259-263, JUL 15 2011.
Web of Science Citations: 6
Abstract

A novel strategy for accomplishing zone trapping in flow analysis is proposed. The sample and the reagent solutions are simultaneously inserted into convergent carrier streams and the established zones merge together before reaching the detector, where the most concentrated portion of the entire sample zone is trapped. The main characteristics, potentialities and limitations of the strategy were critically evaluated in relation to an analogous flow system with zone stopping. When applied to the spectrophotometric determination of nitrite in river waters, the main figures of merit were maintained, exception made for the sampling frequency which was calculated as 189h(-1), about 32% higher relatively to the analogous system with zone stopping. The sample inserted volume can be increased up to 1.0 mL without affecting sampling frequency and no problems with pump heating or malfunctions were noted after 8-h operation of the system. In contrast to zone stopping, only a small portion of the sample zone is halted with zone trapping, leading to these beneficial effects. (C) 2011 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 10/00972-4 - Exploitation of pulsed flow and gas diffusion in a polyvalent analytical flow system: sulfide, sulfite and ethanol monitoring during alcoholic fermentation.
Grantee:Claudineia Rodrigues da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 06/07309-3 - Novel analytical strategies for studies involving biomolecules
Grantee:Elias Ayres Guidetti Zagatto
Support Opportunities: Research Projects - Thematic Grants