Adsorptive stripping voltammetry of uranium: elimination of interferences from surface active substances and application to the determination in natural water samples

2011 ◽  
Vol 3 (5) ◽  
pp. 1046 ◽  
Author(s):  
Malgorzata Grabarczyk ◽  
Anna Koper
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Natural Water Samples ◽  
Surface Active ◽  
Active Substances

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 The determination of titanium contained in Tytanit biostimulant employed to improve crops performance in natural environmental samples

2017 ◽  
Vol 71 (2) ◽  
pp. 115
Author(s):  
Joanna Wasąg ◽  
Malgorzata Grabarczyk
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Environmental Samples ◽  
Stripping Voltammetry ◽  
Environmental Water ◽  
Adsorptive Stripping Voltammetry ◽  
Environmental Water Samples ◽  
Chloranilic Acid ◽  
Titanium Complex

<p>The purpose of this work was to determinate the amount of titanium in different environmental water samples spiked with crop biostimulant Tytanit. The measurements were conducted using adsorptive stripping voltammetry (AdSV). The titanium complex with chloranilic acid was accumulated on mercury film silver based electrode (Hg(Ag)FE) at the potential -0.3 V. The analysis of natural water samples enriched with Tytanit, collected in the eastern part ofPolandconfirms that this procedure is fast and essential for the determination of titanium in environmental water samples.</p>

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.

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