Electrochemical Behavior of meso-Substituted Porphyrins: The Role of Cation Radicals to the Half-Wave Oxidation Potential Splitting

2016 ◽  
Vol 120 (28) ◽  
pp. 5504-5511 ◽  
Author(s):  
Thai T. H. Tran ◽  
Yan-Ru Chang ◽  
Tuan K. A. Hoang ◽  
Ming-Yu Kuo ◽  
Yuhlong O. Su
Keyword(s):  
Electrochemical Behavior ◽  
Oxidation Potential ◽  
Cation Radicals ◽  
Half Wave

scholarly journals The role of the 2,7-dinitrozo-1,8-dihydroxynaphthalene-3,6-disulfonic acid reagent in determining the thorium ion (IV)

2021 ◽  
pp. 54-58
Keyword(s):  
Organic Reagent ◽  
Disulfonic Acid ◽  
Acid Base ◽  
Amperometric Titration ◽  
Amperometric Determination ◽  
Half Wave ◽  
Acid Reagent ◽  
Background Electrolytes

The aim is to develop a method for the amperometric determination of thorium (IV) ion with 2,7-dinitroso-1,8-dihydroxynaphthalene-3,6-disulfoxyl reagent. Methods of amperometric determination of thorium by solution of 2,7-dinitrozo-1,8-dihydroxynaphthalene-3,6-disulfonic acid on different acid-base properties of background electrolytes and buffer mixtures are considered. The half-wave potential of new reagent was found by logarithmic analysis equal 0.72 V at pH 2.82, which once again indicates on the irreversibility of the process of electrooxidation of the studied organic reagent in used acid-base medias. The conditions for amperometric titration of thorium are optimized, and the influence of outside accompanying metals on the shape of curves and the results of its determination are investigated.

Some applications of polarography for investigation of equlibria in aqueous solutions of organic compounds

2009 ◽  
Vol 74 (11-12) ◽  
pp. 1777-1789 ◽  
Author(s):  
Petr Zuman
Keyword(s):  
Aqueous Solutions ◽  
Organic Compounds ◽  
Carbonyl Compounds ◽  
Limiting Current ◽  
Nitroso Compounds ◽  
Primary Amines ◽  
Acid Base ◽  
Fast Reactions ◽  
Half Wave

There are two possibilities how to follow equilibria of organic compounds established in aqueous solutions using polarography: for very fast reactions, information can be obtained from shifts of half-wave potentials. For slowly established equilibria, the changes in the limiting current are followed. In both cases variation of the half-wave potentials or limiting currents with concentration of a reactant, present in excess, is followed. The types of reactions, which had been followed in this way, are as follows: hydration–dehydration equilibria, additions of hydroxide ion to carbonyl and nitroso compounds, the role of slowly established acid–base equilibria involving C-acids; further also reactions involving the addition of ammonia, primary amines, hydroxylamine, and hydrazine to carbonyl compounds.

scholarly journals Role of Landfill Cover in Reducing Methane Emission

2013 ◽  
Vol 39 (3) ◽  
pp. 115-126 ◽  
Author(s):  
Yucheng Cao ◽  
Ewelina Staszewska
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Global Warming ◽  
Methane Oxidation ◽  
Landfill Gas ◽  
Oxidation Potential ◽  
Landfill Cover ◽  
High Fraction ◽  
Engineered Landfill

Abstract Uncontrolled emissions of landfill gas may contribute significantly to climate change, since its composition represents a high fraction of methane, a greenhouse gas with 100- year global warming potential 25 times that of carbon dioxide. Landfill cover could create favourable conditions for methanotrophy (microbial methane oxidation), an activity of using bacteria to oxidize methane to carbon dioxide. This paper presents a brief review of methanotrophic activities in landfill cover. Emphasis is given to the effects of cover materials, environmental conditions and landfill vegetation on the methane oxidation potential, and to their underlying effect mechanisms. Methanotrophs communities and methane oxidation kinetics are also discussed. Results from the overview suggest that well-engineered landfill cover can substantially increase its potential for reducing emissions of methane produced in landfill to the atmosphere.

Role of hydrogen bonding in the oxidation potential of enols

2003 ◽  
Vol 16 (7) ◽  
pp. 373-379 ◽  
Author(s):  
Mukul Lal ◽  
Anja Langels ◽  
Hans-Jörg Deiseroth ◽  
Jens Schlirf ◽  
Michael Schmittel
Keyword(s):  
Hydrogen Bonding ◽  
Oxidation Potential
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