scholarly journals Flow injection–differential pulse anodic stripping voltammetry to measure As(III) and As(V) in natural water samples

ScienceAsia ◽  
2016 ◽  
Vol 42 (4) ◽  
pp. 266
Author(s):  
Supunnee Duangthong ◽  
Amornrat Suwanin ◽  
Pipat Chooto ◽  
Chalermpol Innuphat
Keyword(s):  
Flow Injection ◽  
Natural Water ◽  
Water Samples ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Natural Water Samples ◽  
Anodic Stripping

scholarly journals Nafion-Protected Sputtered-Bismuth Screen-Printed Electrode for On-site Voltammetric Measurements of Cd(II) and Pb(II) in Natural Water Samples

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 279 ◽  
Author(s):  
Samuel Frutos-Puerto ◽  
Conrado Miró ◽  
Eduardo Pinilla-Gil
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Inductively Coupled Plasma ◽  
Surface Characterization ◽  
Anodic Stripping Voltammetry ◽  
Detection Limits ◽  
Reference Method ◽  
Stripping Voltammetry ◽  
Natural Water Samples ◽  
Screen Printed

In this work, we explore the protection with Nafion of commercial sputtered-bismuth screen-printed electrodes (BiSPSPEs), to improve its ability for on-site determination of Cd(II) and Pb(II) ions in ambient water samples. The modified screen-printed platform was coupled with a miniaturized cell, in combination with a battery-operated stirring system and a portable potentiostat operated by a laptop for decentralized electrochemical measurements using Square-Wave Anodic Stripping Voltammetry (SWASV). We also describe a detailed electrode surface characterization by microscopy and surface analysis techniques, before and after the modification with Nafion, to get insight about modification effect on signal size and stability. Optimization of the chemical composition of the medium including the optimization of pH, and instrumental parameters, resulted in a method with detection limits in the low ng/mL range (3.62 and 3.83 ng·mL−1 for Cd and Pb respectively). Our results show an improvement of the sensitivity and stability for Nafion-protected BiSPSPEs in pH = 4.4 medium, and similar or lower detection limits than comparable methods on commercial BiSPSPEs. The values obtained for Pb(II) and Cd(II) in natural water samples agreed well with those obtained by the much more costly Inductively Coupled Plasma Mass Spectrometry, ICP-MS, technique as a reference method (recoveries from 75% to 111%).

scholarly journals New Strategies for the Simple and Sensitive Voltammetric Direct Quantification of Se(IV) in Environmental Waters Employing Bismuth Film Modified Glassy Carbon Electrode and Amberlite Resin

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4130
Author(s):  
Małgorzata Grabarczyk ◽  
Marzena Adamczyk
Keyword(s):  
Glassy Carbon ◽  
Natural Water ◽  
Water Samples ◽  
Certified Reference Materials ◽  
Anodic Stripping Voltammetry ◽  
Selenium Concentration ◽  
Stripping Voltammetry ◽  
Bismuth Film ◽  
Natural Water Samples

An analytical procedure regarding the determination of selenium(IV) by anodic stripping voltammetry exploiting the in situ plated bismuth film electrode is described. Since organics are commonly present in untreated natural water samples, the use of Amberlite XAD-7 resin turns out to be quite important to avoid problems such as the adsorption of these compounds on the working electrode. The optimum circumstances for the detection of selenium in water using differential pulse voltammetry techniques were found to be as follows: 0.1 mol L−1 acetic acid, 1.9 × 10−5 mol L−1 Bi(III), 0.1 g Amberlite XAD-7 resin, and successive potentials of −1.6 V for 5 s and −0.4 V for 60 s, during which the in situ formation of the bismuth film on glassy carbon and the accumulation of selenium took place. The current of the anodic peak varies linearly with the selenium concentration ranging from 3 × 10−9 mol L−1 to 3 × 10−6 mol L−1 (r = 0.9995), with a detection limit of 8 × 10−10 mol L−1. The proposed procedure was used for Se(IV) determination in certified reference materials and natural water samples, and acceptable results and recoveries were obtained.

scholarly journals The simultaneous voltammetry determination of cadmium(II) and lead(II) at bismuth film glassy carbon electode prepared with the use of mediator

2017 ◽  
Vol 72 (1) ◽  
pp. 1
Author(s):  
Katarzyna Domańska ◽  
Katarzyna Tyszczuk-Rotko ◽  
Sabina Dąbal
Keyword(s):  
Metal Ions ◽  
Glassy Carbon ◽  
Water Samples ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Bismuth Film ◽  
Vistula River ◽  
Anodic Stripping

<p>This paper shows a novel, simple and rapid voltammetric procedure, which enables Cd and Pb determination at traces concentrations. All measurements were carried out by differential  pulse anodic stripping voltammetry (DPASV) with total time of analysis of 210 s. The obtained detection limits were 8.46 · 10<sup>-10</sup> mol L<sup>-1</sup> and 2.57 · 10<sup>-10</sup> mol L<sup>-1</sup>  for Cd(II) and Pb(II), respectively. This procedure was successfully applied for the quantification of mentioned metal ions in water samples collected from the Vistula River.</p>

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