| Texto completo | |
| Autor(es): |
Rocha, Diego P.
[1]
;
Cardoso, Rafael M.
[1]
;
Mendonca, Dianderson M. H.
[1]
;
Richter, Eduardo M.
[1]
;
da Silva, Sidnei G.
[1]
;
Batista, Alex D.
[1]
;
Munoz, Rodrigo A. A.
[1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Uberlandia, Inst Chem, BR-38400902 Uberlandia, MG - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electroanalysis; v. 30, n. 1, p. 180-186, JAN 2018. |
| Citações Web of Science: | 4 |
| Resumo | |
This work presents the use of solenoid micro-pumps as a new strategy for sample introduction in batch-injection analysis (BIA). The volume of solution dispensed on each pulse of the solenoid micro-pump (L) is used as fixed and reproducible injection volume for BIA. In this system, the injection steps are possible in stopped flow mode resulting in low background noise levels, which would not be possible under continuous flow conditions and using solenoid micro-pumps. As a proof-of-concept, amperometric and square-wave voltammetric (SWV) determination of dopamine was demonstrated as well as anodic-stripping voltammetry (ASV) of metals. The micro-pump provided injections of 14L of solution per pulse at 512Ls(-1) over the electrode during electrochemical measurement. Moreover, fast injections of analyte or electrolyte were programmed during deposition or conditioning steps of ASV for analyte preconcentration or electrode cleaning. The proposed system improved limits of detection and sensitivity (2-fold), precision and sample throughput in comparison with traditional BIA due to enhanced mass transfer and consequent reduced dispersion of analyte, and possible control of injections without analyst intervention. This work opens new possibilities of applications of the BIA system, including on-line sample treatment (derivatization or dilution steps). (AU) | |
| Processo FAPESP: | 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica |
| Beneficiário: | Marco Aurelio Zezzi Arruda |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |