scholarly journals LabVIEW-based sequential-injection analysis system for the determination of trace metals by square-wave anodic and adsorptive stripping voltammetry on mercury-film electrodes

2003 ◽  
Vol 25 (6) ◽  
pp. 133-140 ◽  
Author(s):  
Anastasios Economou ◽  
Anastasios Voulgaropoulos
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Electrochemical Detector ◽  
Square Wave ◽  
Mercury Film ◽  
Analysis System

The development of a dedicated automated sequential-injection analysis apparatus for anodic stripping voltammetry (ASV) and adsorptive stripping voltammetry (AdSV) is reported. The instrument comprised a peristaltic pump, a multiposition selector valve and a home-made potentiostat and used a mercury-film electrode as the working electrodes in a thin-layer electrochemical detector. Programming of the experimental sequence was performed in LabVIEW 5.1. The sequence of operations included formation of the mercury film, electrolytic or adsorptive accumulation of the analyte on the electrode surface, recording of the voltammetric current-potential response, and cleaning of the electrode. The stripping step was carried out by applying a square-wave (SW) potential-time excitation signal to the working electrode. The instrument allowed unattended operation since multiple-step sequences could be readily implemented through the purpose-built software. The utility of the analyser was tested for the determination of copper(II), cadmium(II), lead(II) and zinc(II) by SWASV and of nickel(II), cobalt(II) and uranium(VI) by SWAdSV.

scholarly journals EX-SITU PREPARED NAFION–IONIC LIQUID COATED MERCURY FILM ELECTRODE FOR ADSORPTIVE STRIPPING VOLTAMMETRY OF LEAD IN THE PRESENCE OF AMARANTH

2014 ◽  
Vol 10 (1) ◽  
pp. 2169-2176 ◽  
Author(s):  
Edgar Orlando Nagles ◽  
Verónica Arancibia
Keyword(s):  
Ionic Liquid ◽  
Tap Water ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Ex Situ ◽  
Linear Calibration ◽  
Square Wave ◽  
Mercury Film ◽  
Relative Standard

Nafion combined with ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM]F3MSO3) coated with mercury film (NLIHgFE) on a glassy carbon electrode modified allow  the determine Pb(II)  by adsorptive stripping voltammetry in the presence of Amaranth (Am).  Properties of the NLIHgFE were characterized    by square wave without and in the presence of other ionic liquid´s with different anion where ([EMIM]F3MSO3) showed to be more convenient in the determination the lead compared with other ionics liquids with smaller anions.     pH 2.6 with buffer Britton-Robinson the complex Am-Pb  was accumulated  by adsorption on surface of the working electrode at -0.3 V by 80 s.  and later reduce at negative potential by square wave and current peak appeared at -0.51 V earmarked to the reduction of lead in the complex. The linear calibration curves with ranged from 0.9–12.0 µgL–1 for Pb(II). The detection limits (3s) were estimated to be around 0.4 µgL–1 to Pb(II) . The relative standard deviations were 2.0 % at the 4.9 µg L–1 level of Pb(II)  with 80 s of accumulation (n=7). Other optimal conditions were  (CAm 0.77 µmol L–1; Eads –0.3 V; Frecuency 15 Hz and Amplitud pulse 25 mV). The methods were validated using reference material  waste waters (SPS–WW1). Finally, the method was successfully applied to the determination of Pb(II) in tap water after UV digestion.

Simultaneous determination of cadmium, lead and copper in chocolate samples by square wave anodic stripping voltammetry

2021 ◽  
pp. 1-9
Author(s):  
Larissa Pinto Silva ◽  
Náira Da Silva Campos ◽  
Thalles Pedrosa Lisboa ◽  
Lucas Vinícius de Faria ◽  
Maria Auxiliadora Costa Matos ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Square Wave ◽  
Anodic Stripping ◽  
Cadmium Lead

scholarly journals Sensitive and fast determination of papaverine by adsorptive stripping voltammetry on renewable mercury film electrode

2013 ◽  
Vol 11 (5) ◽  
pp. 736-741 ◽  
Author(s):  
Robert Piech ◽  
Beata Paczosa-Bator
Keyword(s):  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Calibration Graph ◽  
Adsorptive Stripping Voltammetry ◽  
Film Electrode ◽  
Mercury Film Electrode ◽  
Mercury Film ◽  
Preconcentration Time

AbstractThe renewable mercury film electrode, applied for the determination of papaverine traces using differential pulse adsorptive stripping voltammetry (DP AdSV) is presented. The calibration graph obtained for papaverine is linear from 1.25 nM (0.42 µg L−1) to 95 nM (32.2 µg L−1) for a preconcentration time of 60 s, with correlation coefficient of 0.998. For the renewable mercury electrode (Hg(Ag)FE) with a surface area of 9.1 mm2 the detection limit for a preconcentration time of 60 s is 0.7 nM (0.24 µg L−1). The repeatability of the method at a concentration level of the analyte as low as 17 µg L−1, expressed as RSD is 3.3% (n=5). The proposed method was successfully applied and validated by studying the recovery of papaverine from drugs, urine and synthetic solution.

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