Batch-injection stripping voltammetry of zinc at a gold electrode: application for fuel bioethanol analysis

Tormin, Thiago F.; Narciso, Laiz C.D.; Richter, Eduardo M.; Muñoz, Rodrigo A.A.

doi:10.1016/j.electacta.2015.02.172

Cited by 24 publications

(12 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, in some cases, the application of stirring in the solution inside the BIA cell is necessary. Solid electrodes usually require a preconditioning step, which is more efficient if the solution inside the BIA cell is under stirring 12.…”

Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Pb, Cu and Hg in Biodiesel Using Gold Screen‐printed Electrode: Comparison of Batch‐injection Analysis with Conventional Electrochemical Systems

et al. 2015

View full text Add to dashboard Cite

This article compares the use of batch‐injection analysis (BIA) with a conventional batch system for the anodic stripping voltammetric (ASV) determination of Pb, Cu and Hg in biodiesel using screen‐printed gold electrode (SPGE). The optimized BIA conditions were 200 µL of injection volume of the digested samples at 5 µL s−1 directly on the working electrode of the SPGE immersed in 0.1 mol L−1 HCl solution. Therefore, BIA‐ASV presented the advantages of low sample consumption, which extended the SPGE lifetime to a whole working day of analyses, and potential for on‐site analysis using battery‐powered micropipettes and potentiostats. Although presenting lower sensitivity than conventional systems, the BIA‐ASV presented detection limit values of 1.0, 0.5 and 0.7 µg L−1, respectively for Pb, Cu and Hg, a linear range between 20 and 280 µg L−1, and adequate recovery values (90–110 %) for spiked biodiesel samples.

show abstract

Section: Introductionmentioning

confidence: 99%

Voltammetric Determination of Pb, Cu and Hg in Biodiesel Using Gold Screen‐printed Electrode: Comparison of Batch‐injection Analysis with Conventional Electrochemical Systems

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Several analytical techniques have been proposed to determine metals in ethanol fuel [10], such as electrothermal atomic absorption spectroscopy (ETAAS), [5,11,12,13,14,15,16] microwave inductively plasma optical emission spectrometry (MIP-OES) [6] or voltammetry [17,18,19,20,21]. Flame absortion atomic spectroscopy (FAAS) in turn has been widely employed for this purpose [4,22,23,24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Metal and metalloid determination in bioethanol through inductively coupled plasma-optical emission spectroscopy

Sanchez

Lienemann

Todolı́

2016

Spectrochimica Acta Part B: Atomic Spectroscopy

View full text Add to dashboard Cite

A new method to carry out the elemental determination of metals in bioethanol through ICP-OES has been developed. The procedure is based on the use of a heated Torch Integrated Sample Introduction System (hTISIS) to directly introduce the vaporized sample into the plasma. Two injection modes (continuous liquid aspiration and air-segmented flow injection analysis) have been evaluated. In a first step, the matrix effects caused by several ethanol-water mixtures were removed by operating the hTISIS at 400ºC in segmented injection. Meanwhile, the results also proved that the system could be operated in continuous mode at 200ºC with the complete interferences removal. Finally, twenty-eight real samples with bioethanol contents between 55% and 100% were analyzed with the methods previously developed.Regarding validation, recoveries from 80% to 120% were obtained for 18 analytes and the concentrations found with the proposed method were in agreement with those encountered with a preconcentration method, taken as a reference procedure. Limits of detection went from 3 ng mL -1 for manganese to about 500 ng mL -1 for calcium. This allowed to quantify Cr, Fe, Mg, Mn and Zn in segmented flow injection and Al, Cd, Cr, Cu, K, Mg, Mn, Na and Zn in continuous sample aspiration mode in bioethanol samples.

show abstract

“…Beyond the possibility of automation of the BIA system, the solenoid micro‐pump allows the fast electrode cleaning between injections of samples or standard solutions by electrolyte injection during the conditioning step. The conventional BIA system requires stirring during the conditioning step and longer time of potential application . The high injection rate provided by the solenoid pump facilitates the cleaning of the working electrode during this step.…”

Section: Resultsmentioning

confidence: 99%

Solenoid Micro‐pumps: A New Tool for Sample Introduction in Batch Injection Analysis Systems with Electrochemical Detection

et al. 2017

View full text Add to dashboard Cite

This work presents the use of solenoid micropumps as a new strategy for sample introduction in batchinjection analysis (BIA). The volume of solution dispensed on each pulse of the solenoid micro-pump (mL) 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 14 mL of solution per pulse at 512 mL s À1 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).

show abstract

Batch-injection stripping voltammetry of zinc at a gold electrode: application for fuel bioethanol analysis

Cited by 24 publications

References 31 publications

Voltammetric Determination of Pb, Cu and Hg in Biodiesel Using Gold Screen‐printed Electrode: Comparison of Batch‐injection Analysis with Conventional Electrochemical Systems

Voltammetric Determination of Pb, Cu and Hg in Biodiesel Using Gold Screen‐printed Electrode: Comparison of Batch‐injection Analysis with Conventional Electrochemical Systems

Metal and metalloid determination in bioethanol through inductively coupled plasma-optical emission spectroscopy

Solenoid Micro‐pumps: A New Tool for Sample Introduction in Batch Injection Analysis Systems with Electrochemical Detection

Contact Info

Product

Resources

About