Novel approaches for exploiting relatively slow chemical reactions in flow analysis. Applications to samples of environmental and agronomical relevance.

• Grant number: 11/08011-6
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: August 01, 2011
• End date: September 10, 2015
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Elias Ayres Guidetti Zagatto
• Grantee: Ana Clara Felix Vida
• Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Associated scholarship(s): 14/09842-7 - Design of advanced flow systems with zone merging and zone trapping hyphenated to dynamic leaching tests for the determination of triazine herbicides in samples of agronomical relevance, BE.EP.DR

Abstract

Zone trapping with merging zones will be investigated as an alternative approach in flow analysis involving relatively slow chemical reactions. In this proposal, the sample and reagent solution are simultaneously inserted into convergent carrier streams and the established zones coalesce at the point of confluence, and thereafter are maintained under static conditions inside either the main reactor or the detector. To this end, commuting facilities are important. The main characteristics, potentialities and limitations of the proposal will be compared in relation to the zone stopping approach with merging zones. A model system involving the spectrophotometric determination of nitrite in natural waters will be designed, and the possibilities for trapping the sample zones inside several parallel reactors or inside the the detector, correcting for carry-over, compensating the Schlieren effect and minimizing the reagent consumption will be critically evaluated. One expects to improve performance of the flow system, especially analytical sensitivity, in relation to methods exploiting relatively slow reactions. As applications, procedures will be developed for spectrophotometric determinations of cobalt in grasses, thiobarbituric acid in foodstuffs, chlorophenol and vanadium in natural waters.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

VIDA, ANA C. E.; ZAGATTO, ELIAS A. G.. Exploiting Zone Trapping to Avoid Liberation of Air Bubbles in Flow-based Analytical Procedures Requiring Heating. Analytical Sciences, v. 30, n. 8, p. 833-838, AUG 2014. (11/08011-6, 11/23498-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

VIDA, Ana Clara Felix. Novel approaches for exploiting relatively slow chemical reactions in flow analysis systems. Applications to relevant agronomic and environmental samples. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB) Piracicaba.