The polarographic behaviour of tungstate at the dropping mercury electrode

1968 ◽  
Vol 240 (1) ◽  
pp. 9-19 ◽  
Author(s):  
R. M. Issa ◽  
B. A. Abd-el-Nabey ◽  
A. M. Hindawey
Keyword(s):  
Mercury Electrode ◽  
Polarographic Behaviour ◽  
Dropping Mercury Electrode

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.

Contribution to the solution chemistry and polarographic behaviour of anthrapurpurin complexan

1979 ◽  
Vol 57 (24) ◽  
pp. 3243-3246 ◽  
Author(s):  
F. Capitan ◽  
A. Guiraum ◽  
J. L. Vilchez ◽  
J. F. Arenas
Keyword(s):  
Dissociation Constants ◽  
Mercury Electrode ◽  
Solution Chemistry ◽  
Acid Dissociation ◽  
Hydrogen Ions ◽  
Differential Analysis ◽  
Acid Dissociation Constants ◽  
Spectrophotometric Methods ◽  
Polarographic Behaviour ◽  
Dropping Mercury Electrode

The reduction of the 1,2,7-trihydroxyanthraquinone-3-methylamino-N,N-diacetic acid at dropping mercury electrode has been investigated. The reduction involves two electrons as well as either one or two hydrogen ions depending on the pH. Two alternative reaction mechanisms are proposed. Five acid-dissociation constants have been determined by potentiometric and spectrophotometric methods. A sequence for the dissociation of the protons is proposed. Thermal gravimetric and differential analysis of the anhydrous and dihydrated reagent are reported.

Polarographic behaviour of petroleum components in aqueous solutions: Application of electrocapillary measurements and convective adsorption accumulation

1986 ◽  
Vol 51 (8) ◽  
pp. 1595-1603 ◽  
Author(s):  
Ladislav Novotný ◽  
Robert Kalvoda
Keyword(s):  
Surface Activity ◽  
Mercury Electrode ◽  
Diesel Oil ◽  
Analytical Determination ◽  
Polarographic Behaviour ◽  
Petroleum Fractions ◽  
Dropping Mercury Electrode ◽  
Strong Surface ◽  
Drop Time

Electrocapillary investigations by the drop time method revealed a rather strong surface activity of aqueous petroleum solutions and some petroleum fractions in solutions of base electrolytes at the dropping mercury electrode, depending on the quality of the surfactant. The highest surface activity and sensitivity of analytical determination was found between -0.4 and -0.6 V (S.C.E.). The detection limit of the electrocapillary method was 10-20 μg/l for Diesel oil and up to 5 times higher for petroleum samples. The sensitivity of the measurements at lowest concentrations was increased by convective adsorption accumulation at the surface of the growing drop.

Polarographic Determination of 7-Diethylamino-4-methylcoumarin

1995 ◽  
Vol 60 (5) ◽  
pp. 802-812
Author(s):  
Jiří Barek ◽  
Roman Hrnčíř ◽  
Josino C. Moreira
Keyword(s):  
Mercury Electrode ◽  
Differential Pulse ◽  
Polarographic Determination ◽  
Differential Pulse Polarography ◽  
Whitening Agent ◽  
Polarographic Behaviour ◽  
Pulse Polarography ◽  
Dropping Mercury Electrode ◽  
Technical Products

The polarographic behaviour of the title optical whitening agent was studied in aqueous-methanolic solutions. Conditions for its quantitation were found within the concentration regions of 10 to 100 μmol l-1 by tast polarography, 1 to 100 μmol l-1 by differential pulse polarography on the conventional dropping mercury electrode, and 0.1 to 10 μmol l-1 by differential pulse polarography on a static mercury drop electrode. The analytical procedures developed were applied to the determination of the compound in technical products.

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