Cathodic Stripping Voltammetry of Selenium(IV) at a Silver Disk Electrode

Ishiyama, Takashi; Tanaka, Tatsuhiko

doi:10.1021/ac960446r

Cited by 45 publications

(41 citation statements)

References 25 publications

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“…A new, simple, and reproducible method is described for the determination of Se (IV) based on differential pulse cathodic stripping voltammetry (DPCSV). The calibration graph is linear up to at least 40 ng/ml of Se(IV) with a relative standard deviation (RSD%) of 2.7% for 20 ng/ml (n=5) [3]. Electrochemical sensor with the renewable silver annular band working electrode and its application for cathodic stripping voltammetric determination of Se(IV) in real water samples was applied [4].…”

Section: Introductionmentioning

confidence: 99%

Development and Validation of Differential Pulse Anodic Stripping Voltammetric Analysis of Selenium (Iv) in Bulk and in Dosage Formulations at a Gold Electrode Multi-Modified With a Mixture of 3, 3′-DIAMINOBENZIDINE.4HCL and Vitamin E

Ramadan

Mandil

Shikh-Debes

2017

Int J Pharm Pharm Sci

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Objective: A simple, direct and very sensitive differential pulse anodic stripping voltammetric analysis (DPASVA) of selenium (IV) in bulk and in dosage formulations using a gold electrode multi-modified with a mixture of 3,3′-diaminobenzidine.4HCl (Dab) and vitamin E (VE)-Nafion (AuEMDabVEN) has been studied. Methods:The method involves the study of various parameters (electrolyte, deposition time, pulse duration, pulse amplitude, etc.) affecting the Se(IV) determination. The proposed method was validated for specificity, linearity, precision and accuracy, repeatability, sensitivity (LOD and LOQ), robustness and solution stability with an average recovery of 98.1-100.32%.Results: Se(IV)was determined in an aqueous HClO4 (0.2M) medium of pH 0.22 at an accumulation potential of-250 mV and an accumulation time of 200 s for CSe(IV) at 1x10 -8 to 1x10 -6 mol/l (0.7896-78.96 ng/ml) and 350 s for CSe(IV) at 1x10 -9 to 1x10 -8 mol/l (0.07896-0.7896 ng/ml) with relative standard deviations (RSD) ≤ 2.4% and 4.8%, respectively. Conclusion:This method showed very sensitive results for the determination of Se(IV) using an AuEMDabVEN than that obtained using the individual Dab or VE. This method could be applicable for the quantitative determination of the bulk Se(IV) as well as dosage formulations.

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Section: Introductionmentioning

confidence: 99%

Development and Validation of Differential Pulse Anodic Stripping Voltammetric Analysis of Selenium (Iv) in Bulk and in Dosage Formulations at a Gold Electrode Multi-Modified With a Mixture of 3, 3′-DIAMINOBENZIDINE.4HCL and Vitamin E

Ramadan

Mandil

Shikh-Debes

2017

Int J Pharm Pharm Sci

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“…The technique of medium exchange, i.e., the use of a 2 mol dm-3 sodium hydroxide solution as the stripping medium, was employed in order to avoid the evolution of hydrogen and to obtain flatter background current curves. 3 The calibration graph was linear up to at least 50 ng cm-3 of selenium(IV) and passed through the origin, with an RSD of 3.1% for five measurements of 20.0 ng cm 3. It was identical with the calibration graph prepared in the presence of 0.75 mg cm 3 of iron.…”

Section: Resultsmentioning

confidence: 91%

Determination of Selenium in Stainless Steel by Differential Pulse Cathodic Stripping Voltammetry at a Silver Disk Electrode

Ishiyama

Tanaka

1997

ANAL. SCI.

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The accurate determination of selenium, which is added to stainless steel in order to improve the corrosion resistance, is important for the steel industry. In a preceding paper', we reported on a sensitive and reproducible method for the determination of selenium in iron and steel without preliminary separation of iron matrix. This consisted of the electrodeposition on a rotating silver disk electrode as silver selenide in an acidic sample solution (pH 2.5) followed by the stripping in an alkaline medium. Voltammetric interferences from iron matrix and high nickel concentrations (more than about 40-fold amounts of selenium) were eliminated by adding sodium oxalate and by pre-electrolyzing at potentials more negative than -0.4 V vs. SCE, respectively. Unfortunately a time-consuming and laborious standard additions method was required because of serious interferences from the coexisting copper.In the present paper, accordingly, a further investigation has been carried out in order to establish an analytical procedure for the direct quantitation of the selenium content in stainless steel from a calibration graph. Compared with other methods for chemical analysis of stainless steel2, the advantages of this method without using harmful chemicals are simplicity, less experimental skill and rapidity as well as high sensitivity and excellent precision. ExperimentalThe apparatus, reagents and the procedure were the same as those described previously"3, except that sodium bromide was used as the masking agent and that an amount of selenium was determined by reference to a calibration (peak height vs. selenium concentration) graph, which was prepared with 4 cm3 of a 1 % acid mixture (l-to-1-to-198 mixture of hydrochloric acid, nitric acid and water) of pH 2.5 containing 0 to 200 ng of selenium(IV). The sensitivity of the recorder was 31 µA cm'. Results and DiscussionSodium bromide was found to be suitable for masking iron(III) and copper(II) completely. As shown in Figs. 1 and 2, 2 mol dm 3 sodium bromide was selected, allowing the interferences from up to 0.75 mg cm 3 of iron(III) and 60 ng cm 3 of copper(II) to be eliminated. The surface of the silver electrode changed to grayish color after pre-electrolysis in a 2 mol dm 3 sodium bromide solution containing 1 mg cm3 of iron(III). This seems to be due to the deposit of elementary iron. Pre-electrolysis was performed at -0.5 V vs. SCE in order to suppress the interference from high nickel concentrations.The deposition time and the scan rate were the same as those previously recommended.',3 More than 50% of selenium in a 4-cm3 aliquot of the electrolyte containing 3 mg of iron was electrodeposited on the rotating silver disk electrode (2.0X103 rpm) during 30 min, which yielded adequate sensitivity for selenium determination. The deposited silver selenide was completely stripped during a single Cathodic scan at a rate of 50 mV s-'. The technique of medium exchange, i.e., the use of a 2 mol dm-3 sodium hydroxide solution as the stripping medium, was employed in order to a...

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“…The analytical methods most often used to determine traces of selenium in environmental samples are atomic absorption spectrometry (AAS) [4,5], inductively coupled plasma atomic emission spectrometry (ICP-AES) [6], inductively coupled plasma mass spectrometry (ICP-MS) [7], neutron activation analysis [8], voltammetry [9]. In case of voltammetry used are stripping methods such as anodic stripping voltammetry (ASV) at gold [10 -12] and carbon electrodes [13], adsorptive stripping voltammetry [14,15] and cathodic stripping voltammetry (CSV) at copper microelectrode [16], copper-modified mercury-film electrode [17], hanging copper amalgam drop electrode [18], ceramic composite electrode [19] or silver disk electrode [20]. A very sensitive cathodic stripping voltammetry based on the formation of HgSe deposited on the surface of the mercury electrode [21 -25] and mercury-film electrodes (MFE-GC) [26] are described.…”

Section: Introductionmentioning

confidence: 99%

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

Piech

2008

Electroanalysis

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The new cyclic renewable mercury film silver based electrode (Hg(Ag)FE), applied for the determination of selenium(IV) traces in the presence of copper ions using differential pulse cathodic stripping voltammetry (DP CSV) is presented. The preparation of the Hg(Ag)FE is very simple. The effects of various factors such as: preconcentration potential and time, pulse height, step potential and supporting electrolyte composition are optimized. The calibration graph is linear from 0.5 nM (39 ng L À1) to 100 nM (7.9 mg L À1) for a preconcentration time of 45 s, with correlation coefficient of 0.9995. For a Hg(Ag)FE with a surface area of 8 mm 2 the detection limit for a preconcentration time of 90 s is as low as 17 ng L À1 . The repeatability of the method at a concentration level of the analyte as low as 2 mg L À1 , expressed as RSD is 2.7% (n ¼ 7). The proposed method was successfully applied and validated by studying the certified reference material (bovine liver BCR-185) and simultaneously recovery of Se(IV) from spiked water samples.

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Cathodic Stripping Voltammetry of Selenium(IV) at a Silver Disk Electrode

Cited by 45 publications

References 25 publications

Development and Validation of Differential Pulse Anodic Stripping Voltammetric Analysis of Selenium (Iv) in Bulk and in Dosage Formulations at a Gold Electrode Multi-Modified With a Mixture of 3, 3′-DIAMINOBENZIDINE.4HCL and Vitamin E

Development and Validation of Differential Pulse Anodic Stripping Voltammetric Analysis of Selenium (Iv) in Bulk and in Dosage Formulations at a Gold Electrode Multi-Modified With a Mixture of 3, 3′-DIAMINOBENZIDINE.4HCL and Vitamin E

Determination of Selenium in Stainless Steel by Differential Pulse Cathodic Stripping Voltammetry at a Silver Disk Electrode

Determination of Selenium Traces on Cyclic Renewable Mercury Film Silver Electrode in Presence of Copper Ions Using Cathodic Stripping Voltammetry

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