scholarly journals Electrochemical Determination of the Diffusion Coefficient of Hydrogen Through an LaNi4.25Al0.75 Electrode in Alkaline Aqueous Solution

1995 ◽  
Vol 142 (8) ◽  
pp. 2695-2698 ◽  
Author(s):  
G. Zheng ◽  
B. N. Popov ◽  
R. E. White
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Electrochemical Determination ◽  
Alkaline Aqueous Solution

scholarly journals Linear sweep polarographic determination of nucleic acids using acridine orange as a bioprobe

2007 ◽  
Vol 72 (11) ◽  
pp. 1085-1094 ◽  
Author(s):  
Wei Sun ◽  
Na Zhao ◽  
Xianlong Yuan ◽  
Kui Jiao
Keyword(s):  
Aqueous Solution ◽  
Acridine Orange ◽  
Electrochemical Method ◽  
Electrochemical Determination ◽  
Determination Method ◽  
Linear Regression Equation ◽  
Peak Potential ◽  
Linear Sweep ◽  
Buffer Solution

The interaction of acridine orange (AO) with double-stranded (ds) DNA in aqueous solution was investigated by linear sweep polarography (LSP) on a dropping mercury working electrode (DME). In pH 2.5 Britton-Robinson (B-R) buffer solution, AO had a sensitive linear sweep polarographic reductive peak at -0.89 V (vs. SCE), which could be greatly inhibited by the addition of dsDNA, with a positive shift of the peak potential. Based on the decrease of the reductive peak current, a new quantitative electrochemical determination method for dsDNA was developed with a linear range of 2.0?20.0 mg l-1 and the linear regression equation: ?Ip" (nA) = 111.90 C (mg l-1)+125.32 (n = 9, ? = 0.997). The influences of commonly co-existing substances, such as metal ions, amino acid, etc., on the determination were also investigated. The method is sensitive, rapid and simple with good selectivity. The new proposed method was further applied to the detection of RNA and three synthetic samples containing dsDNA with satisfactory results. The binding number and the equilibrium constant between dsDNA and AO were calculated by an electrochemical method.

Electrochemical Determination of Neomycin and Norfloxacin at a Novel Polymer Nanocomposite Electrode in Aqueous Solution

2017 ◽  
Vol 50 (12) ◽  
pp. 1887-1896 ◽  
Author(s):  
Siyabulela Hamnca ◽  
Lisebo Phelane ◽  
Emmanuel Iwuoha ◽  
Priscilla Baker
Keyword(s):  
Aqueous Solution ◽  
Polymer Nanocomposite ◽  
Electrochemical Determination

Electrochemical determination of ferrocene diffusion coefficient in [C6MIM][PF6]–CO2 biphasic system

2011 ◽  
Vol 56 (2) ◽  
pp. 130-136 ◽  
Author(s):  
Sébastien Chanfreau ◽  
Bing Yu ◽  
Liang-Nian He ◽  
Olivier Boutin
Keyword(s):  
Diffusion Coefficient ◽  
Electrochemical Determination ◽  
Biphasic System

The chlorination of isobutyrophenone: determination of its pKa value and of the course of the reaction

1990 ◽  
Vol 68 (3) ◽  
pp. 397-403 ◽  
Author(s):  
J. Peter Guthrie ◽  
John Cossar
Keyword(s):  
Aqueous Solution ◽  
Alkaline Hydrolysis ◽  
Subsequent Oxidation ◽  
Alkaline Aqueous Solution ◽  
Pka Value

Chlorination of isobutyrophenone in alkaline aqueous solution leads to formation of α-hydroxyisobutyrophenone as the first detectable intermediate; a slow subsequent oxidation gives benzoate. From the rates of the initial chlorinations we have been able to determine the pKa value for the ketone as 18.18 ± 0.50. α-Chloroisobutyrophenone undergoes surprisingly rapid alkaline hydrolysis, kOH = 71.9 ± 1.5 M−1 s−1. Keywords: isobutyrophenone, chlorination, enolization, pKa, hydrolysis.

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