Polarographic Determination of Dissolved Oxygen. Study of Drop Time with Rapid-Dropping Mercury Electrode

1959 ◽  
Vol 31 (4) ◽  
pp. 502-508 ◽  
Author(s):  
J. H. Karchmer
Keyword(s):  
Dissolved Oxygen ◽  
Mercury Electrode ◽  
Polarographic Determination ◽  
Dropping Mercury Electrode ◽  
Drop Time

POLAROGRAPHIC DETERMINATION OF BENZOYL PEROXIDE AND CUMENE HYDROPEROXIDE

1951 ◽  
Vol 29 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Paul A. Giguère ◽  
D. Lamontagne
Keyword(s):  
Dissolved Oxygen ◽  
Benzoyl Peroxide ◽  
Mercury Electrode ◽  
Cumene Hydroperoxide ◽  
Polarographic Determination ◽  
Polarographic Method ◽  
Organic Peroxides ◽  
Half Wave ◽  
Dropping Mercury Electrode

Benzoyl peroxide and cumene hydroperoxide (CHP) are reduced at the anodically polarized dropping mercury electrode, the former at about +0.3 volt vs. S.C.E., and the latter at +0.1 v. Their half-wave potentials as well as that of the two reduction steps of dissolved oxygen are gradually shifted towards more negative values with increasing concentration of organic peroxides. The polarographic method is suitable for determining these peroxides in concentrations up to 2 × 10−3 mole per liter. Dissolved oxygen does not interfere seriously with the analyses.

Polarographic determination of selenium in tea leaves using a dropping mercury electrode

1996 ◽  
Vol 56 (2) ◽  
pp. 177-180 ◽  
Author(s):  
Guanghan Lu ◽  
Jianhua Liu ◽  
Yiping Hang ◽  
Fang Wang
Keyword(s):  
Mercury Electrode ◽  
Polarographic Determination ◽  
Tea Leaves ◽  
Dropping Mercury Electrode

Polarography of n-butylthioglycolate in aqueous media, methanol, and acetonitrile

1984 ◽  
Vol 62 (9) ◽  
pp. 1817-1821
Author(s):  
K. C. Gupta ◽  
Kalpana K. Sharma
Keyword(s):  
Aqueous Media ◽  
Mercury Electrode ◽  
Wave Characteristics ◽  
Anodic Wave ◽  
Diffusion Controlled ◽  
Dropping Mercury Electrode ◽  
Drop Time ◽  
And Diffusion ◽  
Mechanism Of The Reaction

The polarographic behaviour of n-butylthioglycolate (RSH) at the DME in aqueous media, methanol, and acetonitrile has been investigated in the presence of 0.1 M KNO3 and 0.01% thymol. The effect of pH, concentration of RSH, and drop time on the wave characteristics and the mechanism of the reaction occurring at the surface of the mercury drop have been studied. Well-defined reversible and diffusion-controlled anodic waves were obtained in aqueous media (pH 4.2), 40% methanol (pH 3.22), and 40% acetonitrile (pH 2.96). Mathematical and analytical evidence was obtained to show that the anodic wave of RSH at a dropping mercury electrode in aqueous media, 40% methanol, and 40% acetonitrile is due to the formation of the mercury complex RSHg. The dissociation constant (pK) of the mercapto group in n-butylthioglycolate is 9.6 and the diffusion coefficient in the different media are 1.17 × 10−6 cm2 s−1 (in aqueous media) 1.23 × 10−6 cm2 s−1 (in 40% methanol), and 2.43 × 10−6 cm2 s−1 (in 40% acetonitrile). The linearity of id with RSH concentration provides a rapid and precise method for the determination of RSH, down to 0.4 mM in aqueous media, methanol, and acetonitrile.

POLAROGRAPHIC DETERMINATION OF THE GAMMA ISOMER OF BENZENEHEXACHLORIDE IN INSECTICIDES AND SOIL

1949 ◽  
Vol 27f (9) ◽  
pp. 368-371
Author(s):  
H. Grass ◽  
E. Y. Spencer
Keyword(s):  
Potassium Iodide ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Polarographic Determination ◽  
Simple Method ◽  
Dropping Mercury Electrode

A precise and simple method for the determination of the gamma isomer of benzenehexachloride in commercial insecticides and soil by the dropping mercury electrode is outlined. A satisfactory supporting electrolyte consisted of 1% potassium iodide and a trace of gelatin in 50% ethanol.

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