Modification of a Commercial SMDE Electrode to Improve the Precision of Electrochemical Measurements

González-Arjona, D.; López-Pérez, G.; Roldán, Emilio; Mozo, J. D.

doi:10.1002/1521-4109(200010)12:14<1143::aid-elan1143>3.0.co;2-o

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Mercury was purified by treatment with diluted nitric acid and mercurous nitrate, and it was then distilled three times under vacuum. Cell impedances and dc polarograms were measured with the network analyzer described previously , at t = 4 s after the drop birth. The dc potential was corrected to account for the ohmic drop in the cell, when necessary.…”

Section: Methodsmentioning

confidence: 99%

Application of the Unequal Distances of Closest Approach Theory to the Analysis of Double-Layer Effects on Zn(II) Reduction at a Mercury Electrode

et al. 2001

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The orthogonal collocation technique has been applied to the development of a numerical solution of the unequal distances of closest approach (UDCA) theory for any number of electrolytes and planes of closest approach to the electrode surface. On the basis of theoretical analysis of the reaction coordinate of Zn 2+ reduction by Schmickler et al. (Chem. Phys. 2000, 252, 349), a UDCA analysis of the Frumkin effect on the observed charge-transfer rate constants has been performed. The supporting electrolytes LiClO 4 , Mg(ClO 4 ) 2 , and Al(ClO 4 ) 3 were chosen to vary systematically the distance of closest approach of the electrolyte cation with respect to that of the electroactive species. UDCA distances of closest approach derived from electrocapillary data are shown to provide a reasonable account of the Frumkin effect. However, more consistent results are obtained when variations of the Zn 2+ activity coefficient, computed from the MSA theory, are also considered.

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Section: Methodsmentioning

confidence: 99%

Application of the Unequal Distances of Closest Approach Theory to the Analysis of Double-Layer Effects on Zn(II) Reduction at a Mercury Electrode

et al. 2001

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“…Furthermore, it also serves as a communication interface with the user to display measurement warnings and/or operation requests. The installation, programming and use of this add-on in related applications has been previously described in the literature [37][38][39].…”

Section: Softwarementioning

confidence: 99%

Design of a Portable and Reliable Fluorimeter with High Sensitivity for Molecule Trace Analysis

et al. 2023

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There is a growing need for portable, highly sensitive measuring equipment to analyze samples in situ and in real time. For these reasons, it is becoming increasingly important to research new experimental equipment to carry out this work with advanced, robust and low-cost devices. In this framework, a flexible, portable and low-cost fluorimeter (under EUR 500), based on a C12880 MA MEMS micro-spectrometer with an Arduino compatible breakout board, has been developed for the trace analysis of biological substances. The proposed system can employ two selectable excitation sources for flexibility, one in the visible region at 405 nm (incorporated in the board) and an external LED at 365 nm in the UV region. This additional excitation source can be easily interchanged, varying the LED type for investigating any fluorophore compound of interest. The measurement process is micro-controlled, which allows the precise control of the spectrometer sensitivity by adjusting the integration time of each experiment separately. Data acquisition is easy, reliable and interfaced with a spreadsheet for fast spectra visualization and calculations. For testing the performance of the new device in fluorescence measurements, different fluorophore molecules which can be commonly found in biological samples, such as Fluorescein, Riboflavin, Quinine, Rhodamine b and Ru (II)-bipyridyl, have been employed. A high sensitivity and low quantitation limits (in the ppb range) have been found in all cases for the investigated chemicals. The portable device is also suitable for the study of other interesting phenomena, such as fluorescence quenching induced by chemical agents (such as halide anions or even auto-quenching). In this sense, an application for the quantification of chloride anions in aqueous solutions has been performed obtaining a LOD value of 18 ppm. The obtained results for all chemicals investigated with the proposed fluorimeter are always very similar in quantification figures, or even better than the data reported in literature, when using commercial laboratory equipment.

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Influence of temperature on the reduction kinetics of Zn2+ at a mercury electrode

López-Pérez

Andreu

González-Arjona

et al. 2003

Journal of Electroanalytical Chemistry

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Modification of a Commercial SMDE Electrode to Improve the Precision of Electrochemical Measurements

Cited by 4 publications

References 8 publications

Application of the Unequal Distances of Closest Approach Theory to the Analysis of Double-Layer Effects on Zn(II) Reduction at a Mercury Electrode

Application of the Unequal Distances of Closest Approach Theory to the Analysis of Double-Layer Effects on Zn(II) Reduction at a Mercury Electrode

Design of a Portable and Reliable Fluorimeter with High Sensitivity for Molecule Trace Analysis

Influence of temperature on the reduction kinetics of Zn2+ at a mercury electrode

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