Composite Graphite-Mercury Electrode for Anodic Stripping Voltammetry.

1965 ◽  
Vol 37 (12) ◽  
pp. 1594-1595 ◽  
Author(s):  
W. R. Matson ◽  
D. K. Roe ◽  
D. E. Carritt
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Anodic Stripping

Determination of manganese and zinc in coastal waters by anodic stripping voltammetry with a vibrating gold microwire electrode

2011 ◽  
Vol 8 (5) ◽  
pp. 475 ◽  
Author(s):  
Kristoff Gibbon-Walsh ◽  
Pascal Salaün ◽  
Constant M. G. van den Berg
Keyword(s):  
Coastal Waters ◽  
Anodic Stripping Voltammetry ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Ease Of Use ◽  
In Situ Monitoring ◽  
Irish Sea ◽  
Oxidation Potentials ◽  
Anodic Stripping

Environmental contextMetals in the marine environment play a role in biological processes but can also be toxic. An electrochemical method with a simple microwire electrode is presented that facilitates detection of zinc and manganese in coastal waters. The method is very sensitive and will likely lead to the development of an in-situ monitoring apparatus. AbstractA vibrating, gold, microwire electrode (VGME) is used here to detect low nanomolar levels of dissolved Mn by anodic stripping chronopotentiometry (ASC) and sub-nanomolar levels of dissolved Zn by anodic stripping voltammetry (ASV) in seawater. Mn is detected using a deposition potential (Edep) of –1.35 V, and Zn using Edep = –0.9 V, at pH 8. The method is an example of under-potential deposition (UPD), with positive shifts of the metal oxidation potentials of 0.4–0.6 V compared to the mercury electrode. The limits of detection for Mn (1.4 nM) and for Zn (0.3 nM) in seawater with a 300-s plating time, are better than achieved using other non-mercury based electrodes and nearly as good as a mercury film electrode for Zn. The detection of sub-nanomolar Mn is subject to an unusual interference by arsenate, which lowers the sensitivity when the deposition time is extended beyond 300 s. The VGME has advantages related to robustness, stability and ease of use (no polishing, simple regeneration) facilitating on-site and in-situ use. Zn and Mn are readily measured in seawater of natural pH without the need for reagents, facilitating use of this method in a system for in-situ monitoring. The methods are applied here to coastal seawater (Liverpool Bay, Irish Sea) and can be used for freshwaters such as river water.

The determination of trace amounts of heavy metals in foodstaffs by anodic stripping voltammetry: Optimization of chemical factors

1984 ◽  
Vol 49 (5) ◽  
pp. 1140-1148 ◽  
Author(s):  
Alireza Aliakbar ◽  
Milan Popl
Keyword(s):  
Heavy Metals ◽  
Anodic Stripping Voltammetry ◽  
Background Electrolyte ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Anodic Stripping ◽  
Chemical Factors ◽  
Electrolyte Ph

A study was made of the use of differential pulse anodic stripping voltammetry (DPASV) for the determination of heavy metals (Cd, Pb, Cu) in foodstaffs. A thin-film mercury electrode was used for preconcentration from solution and dissolution. After prior optimization of the instrumental parameters, the effect of the following chemical factors was studied: concentration of mercury(II) ions, electrolysis (enrichment) time and the pH of the background electrolyte. It was found that all three factors affect the sensitivity of the determination of Cd and Pb, while only the electrolysis time and electrolyte pH are important for Cu. All three factors were optimized by the simplex method. The dependence between the concentration and the peak dissolution current was measured for all three metals and the detection and determination limits were found.

Determination of trace amounts of heavy metals in foodstuffs by anodic stripping voltammetry. Optimization of apparatus parameters

1984 ◽  
Vol 49 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Alireza Aliakbar ◽  
Milan Popl
Keyword(s):  
Heavy Metals ◽  
Anodic Stripping Voltammetry ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Pulse Amplitude ◽  
Differential Pulse ◽  
Variable Parameters ◽  
Anodic Stripping ◽  
Two Parameters

The use of differential pulse anodic stripping voltammetry in the determination of heavy metals (Cd, Pb, Cu, As) in foodstuffs was studied. Preconcentrating from solutions and dissolution took place on a thin film mercury electrode. A factorial experiment served to determine the effects of variable parameters of the apparatus, a polarographic analyzer: pulse amplitude, pulse period, and potential scan of the working electrode during dissolution. The first two parameters are significant but the scan rate is not. The apparatus parameters were optimized further by the method of response surface fitting near optimum.

The determination of copper, cadmium, and lead in sea water by anodic stripping voltammetry with a thin film mercury electrode

1981 ◽  
Vol 59 (10) ◽  
pp. 1476-1486 ◽  
Author(s):  
D. G. Green ◽  
L. W. Green ◽  
J. A. Page ◽  
J. S. Poland ◽  
G. van Loon
Keyword(s):  
Thin Film ◽  
Sea Water ◽  
Anodic Stripping Voltammetry ◽  
Mercury Electrode ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Rotating Disk ◽  
Rotating Disk Electrode ◽  
Anodic Stripping

The application of anodic stripping voltammetry to the determination of Cu, Pb, and Cd in acidified sea water samples has been examined. The analyses were carried out using a thin film mercury electrode prepared in situ by the method of Florence. The electrode was rotated in the collection step but held stationary in the stripping step. The stripping involved a linear DC potential ramp and background compensation was employed. Resolution of the stripping peaks required "curve fitting" of the baseline.In the acidified sea water electrolyte it was found that the Pb and Cd stripped to Pb(II) and Cd(II) while the Cu stripped to Cu(I). A good correlation was found between the stripping signals and predictions based on the Levich equation for deposition at a rotating disk electrode and the De Vries and Van Dalen equation for stripping from a thin film electrode. The effect of sample acidity was examined and it was concluded that in unpolluted, filtered sea water the total metal was free for analysis at pH 2. Calibration was by the method of standard addition and intercalibration studies showed that the results agreed well with those obtained by other methods.

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