scholarly journals DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY FOR DETERMINATION OF SOME HEAVY METALS IN URANIUM

2010 ◽  
Vol 9 (2) ◽  
pp. 243-246
Author(s):  
Saryati Saryati
Keyword(s):  
Heavy Metals ◽  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Buffer Solution ◽  
Carbonate Buffer ◽  
Relative Standard ◽  
Anodic Stripping

The direct determination of some metals impurity in uranium by using differential pulse anodic stripping voltammetry (DPASV) method at a hanging mercury drop electrode and in a carbonate buffer media was developed. It was found that the carbonate buffer show the strongest affinity for uranium and gives the best separation between the DPASV peaks of heavy metals impurities. The carbonate concentration markedly affects the oxidation and reduction the major and the minor constituents of the uranium samples. In 0.1 M carbonate buffer solution pH 10, copper, bismuth, thalium, lead, cadmium, zinc, could be determined without the removal of the uranium matrix. Recovery and relative standard deviation (RSD) of this method was in the range of 174% - 85.2% for recovery and 36.8% - 1.2% for RSD. The larger error of analytical result was obtained for Zn at low concentration. In general, the analytic results error and RSD decreased with increasing metals concentration.   Keywords: heavy metal determination, differential pulse anodic stripping voltammetry, uranium

Rapid Direct Determination of Lead in Evaporated Milk by Anodic Stripping Voltammetry Without Sample Pretreatment

1983 ◽  
Vol 66 (6) ◽  
pp. 1409-1413
Author(s):  
Eric W Zink ◽  
Robert A Moffitt ◽  
Wayne R Matson
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Sample Pretreatment ◽  
Stripping Voltammetry ◽  
Relative Standard ◽  
Dry Milk ◽  
Anodic Stripping ◽  
Total Analysis ◽  
Sample Range

Abstract The method presented describes the direct determination of lead in evaporated milk in which the milk ashing step prior to analysis is eliminated. Digital instrument readout units are μg Pb /mL milk. Total analysis time after instrument calibration is less than 3 min per sample. Range of the method is 0.05-1.0 ppm lead in milk, and precision of the method expressed by relative standard deviation of duplicate pairs ranged from 30% at 0.1 μg/mL to 3% at 1.0 μg/mL of lead in milk. The method compares favorably with the AOAC official first action anodic stripping voltammetric method (25.074). In addition, the method appears to work equally well for skim evaporated milk, sweetened condensed milk, and nonfat powdered dry milk when the latter two are reconstituted with water according to product label instructions. Recovery and interference studies are presented.

Determination of Background Levels of Lead and Cadmium in Raw Agricultural Crops by Using Differential Pulse Anodic Stripping Voltammetry

1982 ◽  
Vol 65 (4) ◽  
pp. 987-991 ◽  
Author(s):  
R Duane Satzger ◽  
Charles S Clow ◽  
Evelyn Bonnin ◽  
Fred L Fricke
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Standard Reference Materials ◽  
Agricultural Crop ◽  
Lead And Cadmium ◽  
Relative Standard ◽  
Anodic Stripping ◽  
Quantifiable Level

Abstract A method is described for the simultaneous determination of ultratrace levels of lead and cadmium in selected agricultural crop samples by differential pulse anodic stripping voltammetry. Samples are dry ashed at high temperature with H2SO4 as an ashing aid. Techniques are described to control the lead and cadmium blank levels of 2 ng and 0.4 ng, respectively. Typical relative standard deviations for the crop analyses are 13% at 100 ng/g and 25% at 10 ng/g for lead, and 5% at 100 ng/g and 10% at 10 ng/g for cadmium. The lowest quantifiable level, based on 3 g dry sample, is 2 ng/g for lead and 1 ng/g for cadmium. Recovery studies, precision studies, and analyses of NBS Standard Reference Materials demonstrate the accuracy and reproducibility of this technique. A summary of results for over 1700 crop samples is reported.

scholarly journals Direct Determination of Zn, Cd, Pb and Cu in Wine by Differential Pulse Anodic Stripping Voltammetry

Beverages ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 6 ◽  
Author(s):  
Juliana Maciel ◽  
Michele Souza ◽  
Lisiane Silva ◽  
Daiane Dias
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Anthropogenic Sources ◽  
Organic Substances ◽  
Addition Method ◽  
Anodic Stripping

Metals in wine can originate from natural and anthropogenic sources and their concentrations have significant effects on wine proprieties as well in its conservation. In this work, direct and simultaneous determinations of Zn, Cd, Pb and Cu in wine samples were carried out by differential pulse anodic stripping voltammetry without any steps of previous pretreatment. The samples analyzed presented concentration levels from 4.64 to 69.3 µg L−1 of Zn, from 1.74 to 5.25 µg L−1 of Cd, from 4.57 to 17.9 µg L−1 of Pb and from 1.0 to 10.3 µg L−1 of Cu. Accuracy was evaluated with the standard addition method and recoveries ranged from 82.5 and 130.8% for Zn, from 85.7 to 107.0% for Cd, from 89.7 to 101.0% for Pb and from 81.4 to 105.9% for Cu. With the application of this method, it was possible to quantify the metals in a simple and easy way not requiring sample preparation or other approaches for the destruction of organic substances.

scholarly journals Determination of Zinc levels in Healthy Adults from the West of Algeria by Differential Pulse Anodic Stripping Voltammetry

2010 ◽  
Vol 6 (1) ◽  
pp. 855-860
Author(s):  
Tarik Attar ◽  
Nouria Dennouni Medjati ◽  
Yahia Harek ◽  
Lahcene Larabi
Keyword(s):  
Whole Blood ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Accumulation Time ◽  
Relative Standard ◽  
Anodic Stripping ◽  
Electroanalytical Method ◽  
Zinc Levels

An electroanalytical method has been developed for the determination of zinc in whole blood by differential pulse anodic stripping voltammetry (DPASV) on a hanging mercury drop electrode (HMDE). The best conditions were found to be electrolyte support perchloric acid 0.02M, an accumulation potential of -1150 mV, and an accumulation time of 60 s. The optimum value of stirring rate was determined to be 400 rpm. The correlation coefficient and relative standard deviation were 0.9999 and 3.96% respectively with a detection limit of 0.86 µg L-1. Zinc levels in whole blood samples of 53 healthy subjects living in Tlemcen (west Algeria).

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.

scholarly journals Simultaneous Determination of Zn(II), Cd(II), Pb(II), and Cu(II) Using Differential Pulse Anodic Stripping Voltammetry at a Bismuth Film-Modified Electrode

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Nguyen Mau Thanh ◽  
Nguyen Van Hop ◽  
Nguyen Dinh Luyen ◽  
Nguyen Hai Phong ◽  
Tran Thanh Tam Toan
Keyword(s):  
Graphite Furnace ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Repeated Measurements ◽  
Bismuth Film ◽  
Operational Parameters ◽  
Relative Standard ◽  
Anodic Stripping

The simultaneous electrochemical determination of Zn(II), Cd(II), Pb(II), and Cu(II) in the aqueous solution has been developed on the basis of the bismuth film glassy carbon electrode (GCE) using differential pulse anodic stripping voltammetry (DP-ASV). The bismuth film electrode (BiFE) was prepared by adding 500 ppb bismuth(III) directly to the sample solution and simultaneously depositing bismuth and the metal analytes on GCE. The optimal operational parameters, namely, accumulation potential (–1.6 V), accumulation time (110 s), pulsed amplitude (0.07 V), and scan rate (0.021 V·s−1), were found using a Box–Behnken design. Under the optimum conditions, a linear relationship exists between the current and the concentration of Zn(II), Cd(II), Pb(II), and Cu(II) in the range between 5.0 ppb and 110.0 ppb with the detection limits of 1.07 for Zn(II), 0.93 ppb for Cd(II), 0.65 ppb for Pb(II), and 0.94 ppb for Cu(II) calculated on the basis of a signal-to-noise ratio equal to 3 (S/N = 3). The interference experiments show that Co(II), Ni(II), and Fe(III) have a little influence on the DP-ASV signals of Zn(II), Cd(II), Pb(II), and Cu(II). In addition, a high reproducibility was indicated from small relative standard deviations (1.03%, 1.74%, 1.32%, and 4.74%) for 25 repeated measurements of 15 ppb copper, lead, cadmium, and zinc solutions. BiFE was successfully applied to determine Zn(II), Cd(II), Pb(II), and Cu(II) in river samples, and the results are in a good agreement with those determined with graphite furnace atomic absorption spectrometry (GF-AAS).

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