Results 131 to 140 of about 4,999,106 (187)

Hydrogen Isotope Effect on the Isomerization of Peroxynitrous Acid

Helvetica Chimica Acta, 1998
AbstractThe kinetics of isomerization of deuterium and hydrogen oxoperoxonitrate, ONOOD and ONOOH, respectively, to trioxonitrate(1−), NO, and a deuteron or proton have been studied. Analysis of the pH‐rate profiles result in a normal equilibrium isotope effect (KH/KD) of 3.3. The kinetic deuterium isotope effect for the isomerization reaction is 1.6 ±
Willem H. Koppenol, Patricia L. Bounds, Reinhard Kissner, Sarojini Padmaja   +3 more
openaire   +2 more sources

Kinetics of Peroxynitric Acid Reactions with Halides at Low pH

The Journal of Physical Chemistry A, 2000
The oxidation of iodide, bromide, and chloride by peroxynitric acid (HOONO2) was studied by spectroiodometry. The second-order rate constants were found to be 890 (I-, 295 K), 0.54 (Br-, 295 K), and 0.0014 M-1 s-1 (Cl-, 298.2 K). No pH dependence was observed in any of the systems (pH 1.2−4.9).
Michael Mozurkewich, Jean-Michel Regimbal   +1 more
openaire   +4 more sources

Reaction dynamics of aqueous peroxynitrite and peroxynitrous acid

, 2004
Jan Thøgersen, Dorte Madsen, Jakob Juul Larsen, Svend J. Knak Jensen, S. R. Keiding   +4 more
openalex   +2 more sources

Simultaneous detection of nitrate and nitrite in human urine using CdTe quantum dot-enhanced chemiluminescence from peroxynitrous acid-carbonate system

, 2014
In this study, a novel method has been developed for the simultaneous detection of nitrate and nitrite using CdTe quantum dot-enhanced chemiluminescence(CL) from peroxynitrous acid-carbonate(ONOOH-Na2CO3), coupled with the reduction of nitrate in the ...
Lijuan Zhang, Yingchun Chen, Hongxia Zhang, L. Chao   +3 more
semanticscholar   +1 more source

Theoretical study on the isomerization of peroxynitrous acid (HOONO)

Journal of Molecular Structure: THEOCHEM, 2003
Abstract Isomerization processes of peroxynitrous acid (HOONO) is thoroughly investigated using hybrid density functional theory. The geometries of various stable conformers and transition states of HOONO have been optimized at the B3LYP/6-311+G(d,p) level of theory.
Zun Zhi Wang, Qian Shu Li, Hong Wei Jin, Xuri Huang   +3 more
openaire   +2 more sources

Free radical yields from the homolysis of peroxynitrous acid

Free Radical Biology and Medicine, 1992
A recent study reports discordant results for maximal free-radical yields from the decomposition of peroxynitrous acid using different assay reagents and a puzzling decrease (to zero) of the radical yields with increasing pH. An assay method using 2,2,'azino-bis(3-ethyl-benzthiazoline sulphonate) (ABTS) has been tested using stopped-flow kinetic ...
David R. Blake, Guang Yang, Rajiha A. Saadalla-Nazhat, Peter Jones, Thomas E. G. Candy, Marta Boaro, Najdat B. Nazhat, Helen E. Wilkin   +7 more
openaire   +3 more sources

Hydroxyl Radical Formation during Peroxynitrous Acid Decomposition

Journal of the American Chemical Society, 1999
Yields of O2 formed during decomposition of peroxynitrous acid (ONOOH) under widely varying medium conditions are compared to predictions based upon the assumption that the reaction involves formation of discrete •OH and •NO2 radicals as oxidizing intermediates.
John Coddington, Sergei V. Lymar, James K. Hurst   +2 more
openaire   +2 more sources

Carbonate interlayered hydrotalcites-enhanced peroxynitrous acid chemiluminescence for high selectivity sensing of ascorbic acid.

In Analysis, 2012
In this study, Mg-Al-carbonate layered double hydroxides (denoted as Mg-Al-CO(3) LDHs) were found to catalyze the chemiluminescence (CL) emission from peroxynitrous acid (ONOOH).
Zhihua Wang, Xu Teng, Chao Lu
semanticscholar   +1 more source

Peroxynitrous-acid-induced chemiluminescence of fluorescent carbon dots for nitrite sensing.

Analytical Chemistry, 2011
In this work, chemiluminescent (CL) property of the carbon dots in the presence of peroxynitrous acid was studied. Peroxynitrous acid is formed by online mixing of nitrite and acidified hydrogen peroxide.
Zhen Lin, W. Xue, Hui Chen, Jin‐Ming Lin   +3 more
semanticscholar   +1 more source

Kinetic study of Orange II oxidation using peroxynitrous acid [PDF]

Journal of Physical Organic Chemistry, 2009
AbstractThe reaction of Orange II with peroxynitrous acid has been studied by a spectrophotometrical method. The reaction rate is complex because the order changes from zero to one in function of substrate and oxidant concentration. The influence of pH and ionic strength has been investigated, but their effect on the reaction rate appears to be ...
Beatriz Cabañas, Pablo Corrochano, F. J. Poblete   +2 more
openaire   +1 more source