Polarographic determination of alkaline earths with azo dyes

1991 ◽  
Vol 56 (1) ◽  
pp. 206-215 ◽  
Author(s):  
L. S. Kopanskaya ◽  
V. T. Meryan ◽  
V. A. Smelov
Keyword(s):  
Azo Dyes ◽  
Calcium Concentration ◽  
Mercury Electrode ◽  
Linear Sweep Voltammetry ◽  
Magnesium Concentration ◽  
Linear Sweep ◽  
Limit Of Determination ◽  
Dropping Mercury Electrode ◽  
Alkaline Earths

Magnesium and calcium can be determined in an alkaline medium as complexes with azo dyes by square-wave polarography on the dropping mercury electrode or by linear sweep voltammetry on the hanging mercury drop. The linear dependence of current on magnesium concentration in the presence of IREA magnezone is valid within half an order; in the presence of calcone in a wider range. The lower limit of determination is 2.10-7 mol 1-1. The dependence of current on calcium concentration in the presence of calcion is linear within the interval of 5.10-7 to 4.10-6 mol 1-1 in the voltammetric determination with accumulation.

Polarographic and voltammetric determination of N,N’-dinitrosopiperazine

1991 ◽  
Vol 56 (7) ◽  
pp. 1434-1445 ◽  
Author(s):  
Jiří Barek ◽  
Ivana Švagrová ◽  
Jiří Zima
Keyword(s):  
Mercury Electrode ◽  
Linear Sweep Voltammetry ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Polarographic Reduction ◽  
Concentration Region ◽  
Pulse Polarography ◽  
Chemical Efficiency ◽  
Dropping Mercury Electrode

Polarographic reduction of the genotoxic N,N’-dinitrosopiperazine was studied and its mechanism was suggested. Optimum conditions were established for the determination of this substance by tast polarography over the concentration region of 1 . 10-3 to 1 . 10-6 mol l-1 and by differential pulse polarography on the conventional dropping mercury electrode or by fast scan differential pulse voltammetry and linear sweep voltammetry on a hanging mercury drop electrode over the concentration region of 1 . 10-3 to 1 . 10-7 mol l-1. Attempts at increasing further the sensitivity via adsorptive accumulation of the analyte on the surface of the hanging mercury drop failed. The methods are applicable to the testing of the chemical efficiency of destruction of the title chemical carcinogen based on its oxidation with potassium permanganate in acid solution.

scholarly journals Method Of Polarographic Determination Of Platyphylline In A Form Of N-Oxide And Its Validation In Solution For Injection

2020 ◽  
Vol 15 (2) ◽  
pp. 83-92
Author(s):  
L.O. Dubenska ◽  
O.M. Dushna ◽  
М.V. Plyska ◽  
M. Ye. Blazheyevskіy
Keyword(s):  
Mercury Electrode ◽  
Analytical Form ◽  
Plant Materials ◽  
New Approach ◽  
New Methods ◽  
Component Solution ◽  
Limit Of Determination ◽  
Dropping Mercury Electrode ◽  
Reduction Current

A new approach was studied for determination of alkaloid Platyphylline in a form of N-oxide by reduction current on the dropping mercury electrode. The optimal conditions were selected for chemical transformation (using of potassium peroxymonosulfate) of Platyphylline into N-oxide and with following product reduction on the electrode. On this basis, the methods of determination of Platyphylline in the solution for injections and in tablets were developed. New methods of indication are characterized by very simple sample preparation, wide linear range, low limit of determination (2.1∙10-6 mol∙L–1), sufficient accuracy and selectivity. These methods were checked while analysing one-component solution for injections and combined drug – tablets. The obtained results of analysis were compared to those indicated in the certificate of analysis issued by testing laboratories of the State Service of Ukraine on Medicines and Drugs Control. Defined metrics vary from 97.17 to 102.02 %. The method of determination Platyphylline in the solution for injections «Platyphylline-Zdorovye» is validated (the criterion linearity, accuracy as well as precision). The validation evaluation results have proved the correctness and reliability of the developed method. The main feature of the proposed method for the determination of Platyphylline using N-oxide as an analytical form is the ability to determine directly the metabolite of Platyhylline. Consequently, the work can be adapted for the determination of N-oxide Platyphylline in plant materials.

Determination of platinum in biological material by differential pulse polarography: Analysis in urine, plasma and tissue following sample combustion

1983 ◽  
Vol 48 (10) ◽  
pp. 2903-2908 ◽  
Author(s):  
Viktor Vrabec ◽  
Oldřich Vrána ◽  
Vladimír Kleinwächter
Keyword(s):  
Biological Material ◽  
Biological Fluid ◽  
Mercury Electrode ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Linear Calibration ◽  
Catalytic Current ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode

A method is described for determining total platinum content in urine, blood plasma and tissues of patients or experimental animals receiving cis-dichlorodiamineplatinum(II). The method is based on drying and combustion of the biological material in a muffle furnace. The product of the combustion is dissolved successively in aqua regia, hydrochloric acid and ethylenediamine. The resulting platinum-ethylenediamine complex yields a catalytic current at a dropping mercury electrode allowing to determine platinum by differential pulse polarography. Platinum levels of c. 50-1 000 ng per ml of the biological fluid or per 0.5 g of a tissue can readily be analyzed with a linear calibration.

Polarographic Determination of 6-β-D-Glucopyranosyloxy-7-hydroxycoumarin

1996 ◽  
Vol 61 (3) ◽  
pp. 333-341
Author(s):  
Jiří Barek ◽  
Roman Hrnčíř ◽  
Josino C. Moreira ◽  
Jiří Zima
Keyword(s):  
Natural Compound ◽  
Mercury Electrode ◽  
Direct Determination ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Whitening Agent ◽  
Polarographic Behaviour ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode

The polarographic behaviour was studied for 6-β-D-glucopyranosyloxy-7-hydroxycoumarin, a natural compound serving as an optical whitening agent. The substance can be quantitated by tast polarography, differential pulse polarography using a conventional dropping mercury electrode, and differential pulse polarography using a static mercury drop electrode over the regions of 20-1 000, 2-1 000, and 0.2-1 000 μmol l-1, respectively. The methods developed for the quantitation of the compound were applied to its direct determination in a raw product.

Polarographic and Voltammetric Determination of Trace Amounts of 3-Nitrofluoranthene

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1571-1587 ◽  
Author(s):  
Karel Čížek ◽  
Jiří Barek ◽  
Jiří Zima
Keyword(s):  
River Water ◽  
Solid Phase ◽  
Mercury Electrode ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode ◽  
Separation And Preconcentration

The polarographic behavior of 3-nitrofluoranthene was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a dropping mercury electrode, differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV), both at a hanging mercury drop electrode. Optimum conditions have been found for its determination by the given methods in the concentration ranges of 1 × 10-6-1 × 10-4 mol l-1 (DCTP), 1 × 10-7-1 × 10-4 mol l-1 (DPP), 1 × 10-8-1 × 10-6 mol l-1 (DPV) and 1 × 10-9-1 × 10-7 mol l-1 (AdSV), respectively. Practical applicability of these techniques was demonstrated on the determination of 3-nitrofluoranthene in drinking and river water after its preliminary separation and preconcentration using liquid-liquid and solid phase extraction with the limits of determination 4 × 10-10 mol l-1 (drinking water) and 2 × 10-9 mol l-1 (river water).

A NOTE ON THE POLAROGRAPHIC ANALYSIS OF HYDROGEN PEROXIDE

1948 ◽  
Vol 26b (12) ◽  
pp. 767-772
Author(s):  
Paul A. Giguère ◽  
J. B. Jaillet
Keyword(s):  
Hydrogen Peroxide ◽  
Mercury Electrode ◽  
Limiting Current ◽  
Diffusion Current ◽  
Polarographic Analysis ◽  
Dropping Mercury Electrode ◽  
Strychnine Sulphate

The determination of hydrogen peroxide at concentrations higher than those normally covered in polarography was studied with various electrodes. The diffusion current was found to increase linearly with the peroxide concentration up to 0.15% with the dropping mercury electrode and up to nearly 1% with a fixed platinum microelectrode. Under these conditions the limiting current was about 10 times greater than that usually observed. Although the solutions were supersaturated with oxygen, traces of strychnine sulphate were sufficient to suppress all maxima.

Polarographic determination of oxygen content and capacity in a single blood sample

1965 ◽  
Vol 20 (4) ◽  
pp. 774-778 ◽  
Author(s):  
Domenic A. Maio ◽  
James R. Neville
Keyword(s):  
Blood Sample ◽  
Oxygen Content ◽  
Rapid Determination ◽  
Mercury Electrode ◽  
Potassium Ferricyanide ◽  
Separate Determination ◽  
Polarographic Method ◽  
Dropping Mercury Electrode ◽  
Single Blood Sample

A polarographic method was described in an earlier report which permits the accurate, rapid determination of oxygen content in small samples of blood. As with the Van Slyke technic, total oxygen capacity was formerly estimated by a separate determination of the oxygen content after complete saturation with oxygen of another portion of the blood sample. Further experience with the polarographic method has revealed the feasibility of estimating both content and capacity in a single blood sample. The capacity estimate is made possible by the polarographic observation of the quantity of potassium ferricyanide required to convert ferrohemoglobin to ferrihemoglobin. The measurement of oxygen content is performed, as previously described, by the polarographically determined increase in physically dissolved oxygen caused by the release of bound oxygen. By this means, one avoids sampling and random errors inherent in the use of two separate determinations. The method requires only a brief time for performance and ordinary technical proficiency. It is also simple in application. polarographic dropping mercury electrode; oxygen tension; digitonin; potassium ferricyanide; ferrohemoglobin; ferrihemoglobin Submitted on June 24, 1964

Polarographic and voltammetric determination of genotoxic nitro derivatives of quinoline using mercury electrodes

2011 ◽  
Vol 76 (12) ◽  
pp. 1991-2004 ◽  
Author(s):  
Vlastimil Vyskočil ◽  
Ivan Jiránek ◽  
Aleš Daňhel ◽  
Jiří Zima ◽  
Jiří Barek ◽  
...  
Keyword(s):  
Differential Pulse Voltammetry ◽  
River Water ◽  
Mercury Electrode ◽  
Differential Pulse ◽  
Dropping Mercury Electrode ◽  
Separation And Preconcentration ◽  
Nitro Derivatives ◽  
Pulse Voltammetry ◽  
Derivatives Of

Electrochemical behavior of genotoxic nitro derivatives of quinoline, namely 5-nitroquinoline (5-NQ), 6-nitroquinoline (6-NQ) and 8-nitroquinoline (8-NQ), was investigated by DC tast polarography (DCTP) and differential pulse polarography (DPP), both at a classical dropping mercury electrode (DME), and by differential pulse voltammetry (DPV) and adsorptive stripping differential pulse voltammetry (AdSDPV), both at a miniaturized hanging mercury drop minielectrode (HMDmE), in buffered aqueous (for 5-NQ) or aqueous-methanolic (for 6-NQ and 8-NQ) solutions. Optimum conditions were found for the determination of 5-NQ, 6-NQ and 8-NQ by DCTP at DME (with limits of quantification, LQ ≈ 9 × 10–7, 3 × 10–7 and 2 × 10–6 mol l–1, respectively), by DPP at DME (LQ ≈ 1 × 10–8, 9 × 10–8 and 1 × 10–7 mol l–1, respectively), by DPV at HMDmE (LQ ≈ 2 × 10–8, 1 × 10–7 and 1 × 10–7 mol l–1, respectively), and by AdSDPV at HMDmE (LQ ≈ 1 × 10–8 mol l–1 for 8-NQ; an attempt at increasing the sensitivity using AdSDPV at HMDmE was not successful for 5-NQ and 6-NQ). Practical applicability of the developed methods was verified on the direct determination of the studied compounds in model samples of drinking and river water in submicromolar concentrations and on the determination in model samples of drinking and river water using preliminary separation and preconcentration by solid phase extraction (SPE) in nanomolar concentrations.

Etude polarographique de l'antimoine(III) et (V) dans le fluorure d'hydrogène anhydre et dans ses mélanges avec l'eau

1978 ◽  
Vol 56 (5) ◽  
pp. 703-708 ◽  
Author(s):  
Jacques Devynck ◽  
Bernard Tremillon ◽  
Hugues Menard ◽  
Germain Comarmond
Keyword(s):  
Electrochemical Reaction ◽  
Electrochemical Behaviour ◽  
Mercury Electrode ◽  
Analytical Applications ◽  
Dropping Mercury Electrode

The electrochemical behaviour of Sb(III) and Sb(V) in water–HF mixtures (2.5 to 50% HF) and in anhydrous HF is described. A Teflon capillary dropping mercury electrode is proposed for polarographie investigations in these fluorinated media. It is shown, by classical or puise polarography, that Sb(III) can be reduced to Sb(0), as in acidic non-fluorinated media. The electrochemical reaction becomes reversible by addition of Cl−, Br− or I−. Sb(V) is not electroactive in the various HF-media, except when it is introduced as the SbCl5. In this case, the two polarographie waves of Sb(V) disappear with time because of SbF6− formation. Analytical applications to the determination of Sb(III) in water–HF and in anhydrous HF are discussed.

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