Determination of chromium in estuarine waters by catalytic cathodic stripping voltammetry using a vibrating silver amalgam microwire electrode

Espada-Bellido, Estrella; Bi, Zhaoshun; Berg, Constant M.G. van den

doi:10.1016/j.talanta.2012.10.031

Cited by 18 publications

(9 citation statements)

References 24 publications

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“…The calculation performed based on ten analyses carried out for 1 nmol• Comparing the presented sensor to other electrochemical sensors designated for Cr(VI) determination (see Table 3), it can be noticed that in this case, linear response range was better than obtained for the sensors based on hybrid films of phosphate cellulose and electroactive polymer [29], polyaniline/graphene quantum dot-modified screen-printed carbon electrode [31] and screen-printed carbon electrode modified with gold nanoparticles [32]. The developed sensor exhibited lower limit of detection in comparison with all reported sensors except for vibrating silver amalgam microwire electrode demonstrating similar LOD values [30].…”

Section: Verification Of Sensor Functioningmentioning

confidence: 61%

“…The second form, Cr(VI), has an undesirable effect on the lungs, liver, and kidneys. The examples of electrochemical chromium(VI) determination include the use of a glassy carbon electrode modified with silicomolybdate doped polypyrrole film [28], the preparation of hybrid and electroactive thin films containing microcrystalline cellulose (MC), or MC modified with a phosphate group (PC) in conjunction with polyaniline (PANI) and poly(vinyl sulfonic acid) (PVS) by the layer-by-layer technique [29] or determination in estuarine waters by catalytic cathodic stripping voltammetry using a vibrating silver amalgam microwire electrode [30]. The determination of Cr(VI) employing the screen-printed carbon electrode (SPCE) modified with the use of organic compound (PANI) and graphene quantum dot [31] or inorganic nanoparticles like AuNPs [32] have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Study on self-assembled monolayer of functionalized thiol on gold electrode forming capacitive sensor for chromium(VI) determination

Kochana

Starzec

Wieczorek

et al. 2019

J Solid State Electrochem

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A capacitive sensor based on S-{12-[1-(pyridin-4-ylmethyl)-1H-1,2,3-triazol-4-yl]dodecyl} ethanethioate (FT), a compound with a functional group exhibiting selective affinity towards Cr(VI) ions, was developed. FT was mixed with shorter-chain thiol-decanethiol (DT), to obtain an Au electrode surface well covered by a thiol monolayer. The composition and high quality of self-assembled monolayers (SAMs) were crucial factors influencing the performance of the capacitive sensor. In this work, SAMs formed from FT and DT mixtures with different compositions were studied. For physicochemical characterization of SAMs X-ray photoelectron spectroscopy (XPS), contact angle measurements as well as atomic force microscopy (AFM) were used. Cyclic voltammetry was employed to estimate an electrode surface coverage. Based on the obtained results, the composition of thiol layer providing the best parameters for capacitive sensing of chromium(VI) was chosen. Moreover, the analytical performance of sensor was verified.

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Section: Verification Of Sensor Functioningmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Study on self-assembled monolayer of functionalized thiol on gold electrode forming capacitive sensor for chromium(VI) determination

Kochana

Starzec

Wieczorek

et al. 2019

J Solid State Electrochem

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“…Mercury based electrodes [13,14,21,22] were commonly used for the AdCSV determination of Cr(VI) but due to mercury toxicity different electrode materials like bismuth [16,19] or carbon [8,10] were proposed for Cr(VI) determination.…”

Section: Introductionmentioning

confidence: 99%

Flow based determination of Cr(VI) by adsorptive cathodic stripping voltammetry on an immobilized magnetic poly(ionic liquid) modified electrode

Ferreira

Rodríguez

Galán-Vidal

et al. 2018

Talanta

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In this work an electrochemical procedure for Cr(VI) flow based determination in tap water is presented. An AdCSV method was developed using a screen printed electrode modified with magnetic poly(1-allyl-3-methylimidazolium) chloride and the procedure does not require the addition of complexing agents in the solution unlike the methodologies reported so far for Cr(VI) determination. The flow based system is described and the control variables were studied in detail and optimized using a Taguchi parameters design. Under optimal conditions, the electrochemical sensor offered an excellent response to Cr(VI) and the limit of detection estimated from 3σ was 0.5 µg L (n = 3) allowing the analysis of tap water samples. The effect of interfering ions was also investigated below the maximum permissible limits for tap water according to Mexican standards. The presence of the magnetic particles on the sorbent allowed its easy modification on the electrode surface between each determination when removing the magnetic field placed in the wall-jet cell. Finally, the precision of the method was tested with tap water samples using standard addition method for Cr(VI) quantification and the accuracy was evaluated comparing the results with the dyphenylcarbazide method and by analyzing a certified water sample. The method shows good repeatability and reproducibility (%RSD less than 5%) making it feasible for Cr(VI) flow based determination and no significant difference is observed in the results obtained by both methods.

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“…Platinum microwire electrodes have been widely studied and employed, for example, in sensing . The diffusion to mirowire electrodes is cylindrical and rapidly approaches quasi‐steady state , which helps in stabilising sensor responses.…”

Section: Introductionmentioning

confidence: 99%

“…Platinumm icrowire electrodes have been widely studied [10][11][12] and employed, for example,i ns ensing [ 13]. Thed iffusion to mirowire electrodes is cylindrical and rapidly approaches quasi-steady state [14],w hich helps in stabilising sensor responses.H ence, the application of microwires as fuel cell electrodes has potential benefits in terms of stability of power outputa nd has been em-ployed, for example, in PtCu alloye lectrocatalystt esting [15].Inthis report, we presentarapid methodofcleaning and annealing commercial platinum microwires using electrothermal treatment.…”

mentioning

confidence: 99%

Electrothermal Annealing of Catalytic Platinum Microwire Electrodes: Towards Membrane‐Free pH 7 Glucose Micro‐Fuel Cells

et al. 2016

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Surface activation and cleaning of platinum micro‐wires of 25 micron diameter has been achieved by a short one‐second electrothermal annealing treatment in air at 0.3 A (to orange glow). Voltammetric data suggest a decrease in the electrochemically active surface area with annealing time and a change in surface structure towards the Pt(100) crystalline face. The impact of electrothermal annealing on the electrocatalytic activity towards (i) oxygen reduction and (ii) glucose oxidation in pH 7 phosphate buffered aqueous solutions is investigated. In contrast to as‐received platinum, annealed platinum produces an electrocatalytic response towards glucose oxidation with increasing glucose concentration. A short one‐second anneal step is just as effective in enhancing catalysis as prolonged electrochemical cleaning in sulphuric acid. Finally, by combining a non‐annealed and an annealed microwire electrode, a very simple membrane‐free micro‐fuel cell system is devised operating in phosphate buffer at pH 7 with linearly increasing power output reaching 2.2 nW cm−2 for high glucose levels of 0.5 M.

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Determination of chromium in estuarine waters by catalytic cathodic stripping voltammetry using a vibrating silver amalgam microwire electrode

Cited by 18 publications

References 24 publications

Study on self-assembled monolayer of functionalized thiol on gold electrode forming capacitive sensor for chromium(VI) determination

Study on self-assembled monolayer of functionalized thiol on gold electrode forming capacitive sensor for chromium(VI) determination

Flow based determination of Cr(VI) by adsorptive cathodic stripping voltammetry on an immobilized magnetic poly(ionic liquid) modified electrode

Electrothermal Annealing of Catalytic Platinum Microwire Electrodes: Towards Membrane‐Free pH 7 Glucose Micro‐Fuel Cells

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