scholarly journals Determination of Trace Metal Ions in Common Salt by Stripping Voltammetry

1999 ◽  
Vol 82 (6) ◽  
pp. 1413-1418 ◽  
Author(s):  
Azza M M Ali
Keyword(s):  
Metal Ion ◽  
Supporting Electrolyte ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Ion Concentration ◽  
Common Salt ◽  
Trace Metal Ions

Abstract Sensitive voltammetric methods using cathodic and anodic differential pulse stripping techniques were applied for determination of trace ions cadmium(II), cobalt(II), copper(II), lead(II), manganese(II), nickel(II), and zinc(II), which are usually found in different grades of common salt as contaminants. The optimal conditions, i.e., deposition time, preconcentration potential, supporting electrolyte, and ionic strength, were investigated for each metal ion. Concentration of the metal ion was determined by the standard addition method. Metal content varied according to the quality of the table salt.

scholarly journals Determination of Zn, Cd, Pb and Cu metals in ground water of District Hapur, Uttar Pradesh (India) by anodic stripping voltammetric technique

2014 ◽  
Vol 15 (1&2) ◽  
pp. 195-199
Author(s):  
Udit Mohan ◽  
Randhir Singh ◽  
Prem Singh ◽  
Suhas N. ◽  
Poonam Kashyap Prusty ◽  
...  
Keyword(s):  
Ground Water ◽  
Anodic Stripping Voltammetry ◽  
Uttar Pradesh ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Pulse Amplitude ◽  
Differential Pulse ◽  
Acetate Solution ◽  
Anodic Stripping

In the present communication determination of Zn, Cd, Pb and Cu metals has been carried out from ground water of Hapur District, Uttar Pradesh (India) using differential pulse anodic stripping voltammetry (DPASV) at Hanging Mercury Dropping Electrode (HMDE). Determination of Zn, Cd, Pb and Cu was carried out by using acetate solution as buffer (pH 4.6) with a sweep rate of 0.06 V/sec and pulse amplitude 0.05 V by HMDE by standard addition method. The minimum level of Zn, Cd, Pb and Cu should also be near to zero and the concentration found in the ground water sample of Hapur (India) as analyzed 2.1834, 0.0509, 0.0116 and 0.0331mg/L-1 respectively.

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 Voltammetric Determination of Isopropylmethylphenols in Herbal Spices

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6095
Author(s):  
Magdalena Jakubczyk ◽  
Slawomir Michalkiewicz ◽  
Agata Skorupa ◽  
Daria Slefarska
Keyword(s):  
Electrode Materials ◽  
Supporting Electrolyte ◽  
Sodium Perchlorate ◽  
Total Content ◽  
Standard Addition ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Pulse Voltammetry ◽  
Good Agreement

Thymol and carvacrol—the components of herbal spices—are known for their broad biological activity as antimicrobials and antioxidants. For this reason, it is important to develop new methods for their determination in plant material. A simple, rapid, and sensitive method for determination of total content of these analytes in herbal spices using differential pulse voltammetry (DPV) has been developed. The basis of the research is the oxidation process of isopropylmethylphenols on a platinum microelectrode in glacial acetic acid containing acetonitrile (20%, v/v) and 0.1 mol L−1 sodium perchlorate as the supporting electrolyte. Linear voltammetric responses for thymol and carvacrol were obtained in a wide concentration range from 0.39–1105 and 0.47–640 µg mL−1, with a low detection limit of 0.04 and 0.05 µg mL−1, respectively. The analysis was performed using the multiple standard addition method. The results of the voltammetric determination are in good agreement with the data of the standard chromatographic method. To the best of our knowledge, this is the first presentation of an electrochemical procedure to determine these compounds in these environmental and electrode materials.

Adsorptive cathodic stripping determination of minoxidil in pharmaceutical, cream and shampoo products

2011 ◽  
Vol 76 (5) ◽  
pp. 371-382 ◽  
Author(s):  
Farhad Ahmadi ◽  
Sahar Ghasemi ◽  
Mehdi Rahimi-Nasrabadi
Keyword(s):  
Supporting Electrolyte ◽  
Pulse Height ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Reduction Wave ◽  
Cyclic Voltammogram ◽  
Topical Solution ◽  
Cathodic Stripping

The cyclic voltammetric behavior of minoxidil was studied in a buffer with pH 3. Contradictory to that mentioned in a previously published work, the cyclic voltammogram of minoxidil exhibited a single 2-electron irreversible reduction wave in a buffer with pH 3. This wave was attributed to the reduction of the N→O bond. The cathodic differential pulse wave height decreased on the increase of pH till it disappeared in solution with pH 7.2. The quantitative trace determination of minoxidil was studied at a hanging mercury drop electrode by adsorptive cathodic stripping voltammetry. A fully validated sensitive procedure based on controlled adsorptive accumulation of the drug onto a HMDE was developed for its direct determination. Accumulation of minoxidil was found to be optimized in 0.1 M Britton–Robinson buffer with pH 2.0 as supporting electrolyte under the following conditions: accumulation potential –0.2 V, accumulation time 40 s, scan rate 40 mV s–1 and pulse height 50 mV. The proposed procedure was applied successfully for determination of minoxidil in its topical solution and illegal shampoo and cream. The mean recoveries of the minoxidil were 99.8, 97.8 and 96.7% and with RSD of 0.86, 1.24 and 1.89% in pharmaceutical topical solution, shampoo and cream, respectively.

scholarly journals Anodic Determination of Acetylsalicylic Acid at a Mildly Oxidized Boron-Doped Diamond Electrode in Sodium Sulphate Medium

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Codruţa Cofan ◽  
Ciprian Radovan
Keyword(s):  
Acetylsalicylic Acid ◽  
Supporting Electrolyte ◽  
Standard Addition ◽  
Differential Pulse ◽  
Sodium Sulphate ◽  
Linear Calibration ◽  
Boron Doped Diamond ◽  
Real Samples ◽  
Boron Doped

Differential pulse voltammetry (DPV) and chronoamperometry (CA) were used to detect and determine acetylsalicylic acid (ASA) at a mildly oxidized boron-doped diamond (BDD) electrode in a neutral sodium sulphate solution as supporting electrolyte. ASA determination in unbuffered medium was achieved using neutralized standard and real samples. Over the concentration range of 0.01 mM–0.1 mM, linear calibration plots of anodic current peaks in DPV and anodic currents in CA experiments versus concentration were obtained with very high correlation coefficients and good sensitivity values. The limits of detection were situated around 1 μM. The association of DPV and CA techniques with standard addition method represented a suitable option for the determination of ASA in real samples such as pharmaceutical formulations.

scholarly journals Trace Voltammetric Determination of Lead at a Recycled Battery Carbon Rod Electrode

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 770 ◽  
Author(s):  
Kevin Honeychurch
Keyword(s):  
Acetic Acid ◽  
Tap Water ◽  
Supporting Electrolyte ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Deposition Potential ◽  
Mineral Acids ◽  
Trace Concentrations

Carbon rod electrodes (CREs) were obtained from recycled zinc–carbon batteries and were used without further modification for the measurement of trace concentrations of lead (Pb). The electrochemical behavior of Pb at these electrodes in a variety of supporting electrolytes was investigated by cyclic voltammetry. The anodic peaks obtained on the reverse scans were indicative of Pb being deposited as a thin layer on the electrode surface. The greatest signal–to–noise ratios were obtained in organic acids compared to mineral acids, and acetic acid was selected as the supporting electrolyte for further studies. Conditions were optimized, and it was possible to determine trace concentrations of Pb by differential pulse anodic stripping voltammetry. A supporting electrolyte of 4% v/v acetic acid, with a deposition potential of −1.5 V (vs. SCE) and a deposition time of 1100 s, was found to be optimum. A linear range of 2.8 µg/L to 110 µg/L was obtained, with an associated detection limit (3σ) of 2.8 µg/L. A mean recovery of 95.6% (CV=3.9%) was obtained for a tap water sample fortified with 21.3 µg/L.

scholarly journals Adsorptive Cathodic Stripping Voltammetric Determination of Cefoperazone in Bulk Powder, Pharmaceutical Dosage Forms, and Human Urine

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Vu Dang Hoang ◽  
Dao Thi Huyen ◽  
Phan Hong Phuc
Keyword(s):  
Human Urine ◽  
Supporting Electrolyte ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Cyclic Voltammograms ◽  
Reduction Wave ◽  
Pharmaceutical Dosage Forms ◽  
Ich Guidelines ◽  
Cathodic Stripping

The electroreduction behaviour and determination of cefoperazone using a hanging mercury drop electrode were investigated. Cyclic voltammograms of cefoperazone recorded in universal Britton-Robinson buffers pH 3–6 exhibited a single irreversible cathodic peak. The process was adsorption-controlled. Britton-Robinson buffer 0.04 M pH 4.0 was selected as a supporting electrolyte for quantitative purposes by differential pulse and square wave adsorptive cathodic stripping voltammetry. The experimental voltammetric conditions were optimized using Central Composite Face design. A reduction wave was seen in the range from −0.7 to −0.8 V. These voltammetric techniques were successfully validated as per ICH guidelines and applied for the determination of cefoperazone in its single and sulbactam containing powders for injection and statistically comparable to USP-HPLC. They were further extended to determine cefoperazone in spiked human urine with no matrix effect.

scholarly journals Nanomolar determination of Pb (II) ions by selective templated electrode

2012 ◽  
Vol 77 (7) ◽  
pp. 899-910 ◽  
Author(s):  
Mohammad Mazloum-Ardakani ◽  
Mohammad Amini ◽  
Marzieh Dehghan ◽  
Elham Kordi ◽  
Mohammad Sheikh-Mohseni
Keyword(s):  
Detection Limit ◽  
Metal Ion ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Transition Metal Ions ◽  
Ion Concentration ◽  
Response Characteristics ◽  
Potentiometric Response ◽  
Voltammetric Detection

Polypyrrole modified electrode, prepared by electropolymerization of pyrrole in the presence of methyl red as a dopant, was templated with respect to Pb2+ ion and applied for potentiometric and voltammetric detection of this ion. The templating process improved the analytical response characteristics of the electrode, specially their selectivity, with respect to Pb2+ ion. The improvement depends on both the incorporated ligand (dopant) and the templating process, with the latter being more vital. The potentiometric response of the electrode was linear within the Pb2+ concentration range of 2.0?10-6 to 5.0?10-2 M with a near-Nernstian slope of 28.6 mV decade-1 and a detection limit of 7.0 ?10-7 M. The electrode was also used for preconcentration differential pulse anodic stripping voltammetry (DPASV) and results showed that peak currents for the incorporated lead species were dependent on the metal ion concentration in the range of 1.0?10-8 to 1.0?10-3 M. The detection limit of DPASV method was 3.5 ?10-9 M. The selectivity of the electrode with respect to some transition metal ions was investigated. The modified-templated electrode was used for the successful assay of lead in two standard reference material samples.

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