Voltammetric Determination of Nitronaphthalenes at a Silver Solid Amalgam Electrode

Pecková, Karolina; Barek, Jiřı́; Navrátil, Tomáš; Yosypchuk, Bogdan; Zima, Jiřı́

doi:10.1080/00032710903142442

Cited by 40 publications

(28 citation statements)

References 54 publications

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“…The reduction of AZT at other types of SAE requires more negative potential with the maximum of À 1300 mV for m-AuSAE. Nearly the same peak potential at m-AgSAE and HMDE was reported also for other organic compounds and inorganic ions (e.g., Cu(II), Pb(II), Cd(II) and Zn(II)) in the absence of specific interactions between the analyte and silver from silver solid amalgam [34,35,37]. The complexation of AZT with any of the amalgam forming metals was not reported, only the detection of thymidine itself in complex with Hg(II) by cathodic stripping voltammetry was published [44].…”

Section: Voltammetric Determination Of Azt At Amalgam Electrodes and supporting

confidence: 58%

Voltammetric Determination of Azidothymidine Using Silver Solid Amalgam Electrodes

et al. 2009

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A new simple and direct electroanalytical method was developed for the determination of azidothymidine in commercial pharmaceutical preparations. It is based on differential pulse voltammetry at silver solid amalgam electrode with polished surface (p-AgSAE) or surface modified by mercury meniscus (m-AgSAE). The electroreduction of azidothymidine in basic media at these electrodes gives rise to one irreversible cathodic peak. Its potential in 0.05 mol L À1 borate buffer, pH 9.3 at ca. À 1050 mV is comparable to that using hanging mercury drop electrode (HMDE). Achieved limits of quantitation are in the 10 À7 mol L À1 concentration range for both amalgam electrodes. According to the procedure based on the standard addition technique, the recoveries of known amounts of azidothymidine contained in pharmaceutical preparations available in capsules were 101.4 AE 1.8% (m-AgSAE), 100.3 AE 3.5% (p-AgSAE) and 102.0 AE 1.0% (HMDE) (n ¼ 10). There was no significant difference between the values gained by proposed voltammetric methods and the HPLC-UV recommended by the United States Pharmacopoeia regarding the mean values and standard deviations.

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Section: Voltammetric Determination Of Azt At Amalgam Electrodes and supporting

confidence: 58%

Voltammetric Determination of Azidothymidine Using Silver Solid Amalgam Electrodes

et al. 2009

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“…This is confirmed by several factors: irreversibility of the signals (both peaks), 30,32 an equal number of electrons and protons involved (both peaks), and shifting of the first signal to more negative potentials with increasing pH. 29,33 Based on these results, we suggest the following electrode reaction pathway: the peak located at -0.65 V represents the reduction of the nitro group to hydroxylamine, and the second signal at -1.15 V is related to the reduction of hydroxylamine to amine (Scheme 2). the peak current was attained up to E SW = 50 mV, which then stabilized, according to theory.…”

Section: Electrochemical Behavior Of Aclonifen and The Influence Omentioning

confidence: 68%

“…[28][29][30][31] In the first pathway (Equation (4) and (5)), reversible formation of one-electron nitro radical anion is followed by irreversible three-electron reduction. As the stability of ArNO 2 · is increased by the absence of In the second possible pathway (Equation (6) and (7)), four-electron reduction of NO 2 to NHOH (Equation (6)) and two-electron reduction of NHOH to NH 2 (Equation (7)) takes place.…”

Section: Electrochemical Behavior Of Aclonifen and The Influence Omentioning

confidence: 99%

Rapid and Sensitive Voltammetric Determination of Aclonifen in Water Samples

Guziejewski

Smarzewska

Skowron

et al. 2016

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This paper presents the use of square wave voltammetry (SWV) and square wave adsorptive stripping voltammetry (SWAdSV) in conjunction with a cyclic renewable silver amalgam film electrode (Hg(Ag)FE) for the determination of aclonifen in spiked water samples. A reduction peak at -0.65 V versus Ag/AgCl was obtained in the selected buffer (borax buffer with pH 9.2), exhibiting the characteristics of an irreversible reaction. The effect of square wave (SW) frequency, SW amplitude and step potential, as well as accumulation parameters (time and potential) were studied to select the optimal experimental conditions. The calibration curve was linear in the aclonifen concentration range from 1.0 × 10 -7 to 1.0 × 10 -6 mol L -1 and from 1.0 × 10 -8 to 1.0 × 10 -7 mol L -1 for SWV and SWAdSV, respectively. The detection and quantification limits were found to be 3.1 × 10 -8 mol L -1 ; 1.0 × 10 -7 mol L -1 and 2.9 × 10 -9 mol L -1 ; 9.6 × 10 -9 mol L -1 for SWV and SWAdSV, respectively. The proposed method was applied successfully in the determination of aclonifen in spiked water samples. The developed procedure can be adequate at least for screening purposes, where positive results should be confirmed by more selective method.

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“…2-NF gave rise to only one irreversible voltammetric peak in acidic, neutral and alkaline media, corresponding to the four-electron reduction of the nitro group to the hydroxyamino group [42]. 2,7-DNF yielded two cathodic peaks over the whole pH region.…”

Section: Voltammetric Behavior Of the Test Substancesmentioning

confidence: 99%

Voltammetric Determination of Genotoxic Nitro Derivatives of Fluorene and 9‐Fluorenone Using a Mercury Meniscus Modified Silver Solid Amalgam Electrode

et al. 2010

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Voltammetric behavior of selected genotoxic nitro compounds (2-nitrofluorene, 2,7-dinitrofluorene, 2-nitro-9-fluorenone and 2,7-dinitro-9-fluorenone) has been investigated using direct current voltammetry (DCV), differential pulse voltammetry (DPV) and adsorptive stripping differential pulse voltammetry (AdSDPV) at a mercury meniscus modified silver solid amalgam electrode (m-AgSAE). The optimum conditions have been found for their determination in a 1 : 1 mixture of methanol and aqueous Britton -Robinson buffer solution, with the limits of quantification, (LOQ), 2, 0.3, 0.5, and 0.5 mmol L À1 (DCV at m-AgSAE) and 0.2, 0.2, 0.4, and 0.2 mmol L À1 (DPV at m-AgSAE) for 2-nitrofluorene, 2,7-dinitrofluorene, 2-nitro-9-fluorenone, and 2,7-dinitro-9-fluorenone, respectively. An attempt at increasing the sensitivity using AdSDPV at m-AgSAE was successful only for 2-nitrofluorene (LOQ ¼ 2 nmol L À1 ). Practical applicability of the newly developed methods was verified on direct determination of the studied compounds in drinking and river waters with LOQs~10 À7 mol L À1 for all the studied compounds.

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Voltammetric Determination of Nitronaphthalenes at a Silver Solid Amalgam Electrode

Cited by 40 publications

References 54 publications

Voltammetric Determination of Azidothymidine Using Silver Solid Amalgam Electrodes

Voltammetric Determination of Azidothymidine Using Silver Solid Amalgam Electrodes

Rapid and Sensitive Voltammetric Determination of Aclonifen in Water Samples

Voltammetric Determination of Genotoxic Nitro Derivatives of Fluorene and 9‐Fluorenone Using a Mercury Meniscus Modified Silver Solid Amalgam Electrode

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