Selenocystine modified screen-printed electrode as an alternative sensor for the voltammetric determination of metal ions

Puy-Llovera, Jaume; Pérez‐Ràfols, Clara; Serrano, Núria; Dı́az-Cruz, José Manuel; Ariño, Cristina; Esteban, Miquel

doi:10.1016/j.talanta.2017.07.089

Cited by 22 publications

(9 citation statements)

References 26 publications

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“…Because of their low production costs and commercial availability, they can be used as highly-reproducible disposable electrodes. Moreover they have a lot of advantages such as appropriate linearity, repeatability, selectivity and sensitivity, ease of surface modification and portability (Puy-Llovera et al 2017;Pérez-Ràfols et al 2016). Therefore, the main purpose of this article was to develop and optimize a new, simple, fast and accurate voltammetric caffeine determination method using a commercially available screen-printed sensor.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive stripping voltammetric method for the determination of caffeine at integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode

2019

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A commercially available screen-printed carbon electrode coated with carbon nanofibers (SPCE/CNFs) and differentialpulse adsorptive stripping voltammetry (DPAdSV) were used to determination of caffeine. The process of electrochemical oxidation of caffeine in 0.1 mol L −1 sulfuric acid at the SPCE/CNFs surface was investigated by cyclic voltammetry (CV). The effect of the supporting electrolyte type, pH and concentration, time and potential of accumulation, amplitude and scan rate were studied to select the optimum experimental conditions. Under the optimized conditions, the well-defined caffeine peak was observed at 1.25 V (vs. screen-printed silver reference electrode) in 0.1 mol L −1 sulfuric acid. The caffeine was accumulated at − 0.8 V for 60 s. The oxidation peak current was proportional to concentration of caffeine from 2.0 × 10 −7 to 1.0 × 10 −6 mol L −1 with detection limit of 5.6 × 10 −8 mol L −1. The presented method has been successfully applied for the determination of caffeine in beverage samples. Keywords Integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode • Adsorptioncontrolled process • Diffusion-controlled process • Voltammetric determination of caffeine • Beverage samples This article belongs to S.I. ISSHAC10, but it reach the press at the time the special issue was published.

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Section: Introductionmentioning

confidence: 99%

Adsorptive stripping voltammetric method for the determination of caffeine at integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode

2019

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“…Table 1 shows how the working electrode material affects the performance for some differently modified SPEs compared with the present work. Furthermore, not only inorganic modified electrodes perform well for heavy metal determination, but also some organic-based modified electrodes were developed for this purpose [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Reusability of SPE and Sb-modified SPE Sensors for Trace Pb(II) Determination

Finšgar

Majer

Maver

et al. 2018

Sensors

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In this work, unmodified screen-printed electrode (bare SPE) and Sb-film modified SPE (SbFSPE) sensors were employed for the analysis of trace amounts of Pb(II) in non-deaerated water solutions. The modified electrode was performed in situ in 0.5 mg/L Sb(III) and 0.01 M HCl. The methodology was validated for an accumulation potential of –1.1 V vs. Ag/AgCl and an accumulation time of 60 s. A comparative analysis of bare SPE and SbFSPE showed that the detection and quantification limits decrease for the bare SPE. The method with the bare SPE showed a linear response in the 69.8–368.4 µg/L concentration range, whereas linearity for the SbFSPE was in the 24.0–319.1 µg/L concentration range. This work also reports the reason why the multiple standard addition method instead of a linear calibration curve for Pb(II) analysis should be employed. Furthermore, the analytical method employing SbFSPE was found to be more accurate and precise compared to the use of bare SPE when sensors were employed for the first time, however this performance changed significantly when these sensors were reused in the same manner. Furthermore, electrochemical impedance spectroscopy was used for the first time to analyse the electrochemical response of sensors after being used for multiple successive analyses. Surface characterisation before and after multiple successive uses of bare SPE and SbFSPE sensors, with atomic force microscopy and field emission scanning electron microscopy, showed sensor degradation. The interference effect of Cd(II), Zn(II), As(III), Fe(II), Na(I), K(I), Ca(II), Mg(II), NO3–, Bi(III), Cu(II), Sn(II), and Hg(II) on the Pb(II) stripping signal was also studied. Finally, the application of SbFSPE was tested on a real water sample (from a local river), which showed high precision (RSD = 8.1%, n = 5) and accurate results.

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“…A variety of compounds such as graphene [16], Co3O4 [17], polymers [18,19] and crown ether [20,21] were also found to be successful in pre-concentrating both metal ions. Organic ligands with electron rich atoms including phytic acid oxygen [22,23], phenolic oxygen and nitrogen [24], cysteine sulfur [25,26] and lysine nitrogen [27] were found to implement better analytical performances for simultaneous determination of Cd(II) and Pb(II). MBT is an alternative ligand containing nitrogen and sulfur [28] which was used in the extraction of both metals before analysis by flame atomic absorption spectroscopy (FAAS) [29], as a biosensor for pesticides [30] and in forming polymeric structure to accommodate more complexing sites [31].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of trace levels of Cd(II) and Pb(II) in tap water samples by anodic stripping voltammetry with 2-mercaptobenzothiazole modified electrode

Phlay¹,

Tapachai²,

Daungthong³

et al. 2019

J. Electrochem. Sci. Eng.

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<span lang="EN-US">Glassy carbon electrode (GCE) modified by 2-mercaptobenzothiazole (MBT), mesoporous silica (Meso) and bismuth was developed to determine Cd(II) and Pb(II) simultaneously by square wave anodic stripping voltammetry (SWASV). In-situ preparation was found to work best in optimum conditions of acetate buffer pH 6, accumulation potential of <br /> -1.1 V, deposition time of 300 s and scan rate of 200 mV/s. SW peaks revealed the linear range of 5-50 µg/L Cd(II) and 5-50 µg/L Pb(II). LOD and LOQ for Cd(II) and Pb(II) were determined as 0.56, 0.80, 1.87 and 2.66 µg/L, respectively. The interaction of metals with bismuth and MBT, as well as higher surface area due to mesoporous silica, support beneficial performance of the modified electrode. Insignificant interferences from other regularly present metal ions were found. With SRM1640 standard, the SWASV results are found comparable to those obtained by inductive coupled plasma optical emission spectrometry (ICP-OES). The method was used to analyze the metals in tap water by standard addition method with the satisfactory recovery of 100.7 % for Cd(II) and 100.8 % for Pb(II).</span>

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Selenocystine modified screen-printed electrode as an alternative sensor for the voltammetric determination of metal ions

Cited by 22 publications

References 26 publications

Adsorptive stripping voltammetric method for the determination of caffeine at integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode

Adsorptive stripping voltammetric method for the determination of caffeine at integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode

Reusability of SPE and Sb-modified SPE Sensors for Trace Pb(II) Determination

Simultaneous determination of trace levels of Cd(II) and Pb(II) in tap water samples by anodic stripping voltammetry with 2-mercaptobenzothiazole modified electrode

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