An electron paramagnetic resonance study of nitrogen dioxide dissolved in water, carbon tetrachloride and some organic compounds

  title={An electron paramagnetic resonance study of nitrogen dioxide dissolved in water, carbon tetrachloride and some organic compounds},
  author={Sara Noem{\'i} Mendiara and A. Sagedahl and Luis Jos{\'e} Perissinotti},
  journal={Applied Magnetic Resonance},
Electron paramagnetic resonance spectrometry was used to characterize and measure the concentration of nitrogen dioxide dissolved in water, carbon tetrachloride, n-hexane, acetone and benzene at 290 K. Solutions were monitored by ultraviolet spectrometry. We measured the equilibrium constant for N2O4 plus NO2 dissolved in n-hexane and carbon tetrachloride. In order to investigate the formation of organic nitroxide type intermediates, some experiments were designed to examine the role of NO and… 

Dissociation equilibrium of dinitrogen tetroxide in organic solvents: An electron paramagnetic resonance measurement

The dissociation equilibrium of N2O4−NO2 has been measured in hexane, carbon tetrachloride and chloroform at different temperatures. The equilibrium constants at 298.15 K (25°C),Km (molality basis),

Reaction of β-carotene with nitrite anion in a homogeneous acid system. An electron paramagnetic resonance and ultraviolet-visible study

Ultraviolet and visible spectroscopy was applied to characterize and to measure the concentration of β-carotene dissolved in a dioxane and water mixture. The reaction of β-carotene in the presence of

Neutral Radicals in the Reaction of β-Carotene with NO2 and NO: Computational Study and Simulation of the EPR Spectra

In our previous paper, the electron paramagnetic resonance (EPR) spectroscopy was applied to investigate the reaction of β-carotene with nitrogen dioxide and nitric oxide both in pure dioxane and

β‐Carotene and Free Radical Reactions with Nitrogen Oxides

The following presentation is based on experimental work we have already developed and published. We investigated the nitrogen oxides in different solvents and analyzed their reaction with

NO2 Measurements At The Bus Station Area In ABig Tourist City In Argentina

Ambient air concentrations of Nitrogen dioxide (NO2) were monitored, together with the main meteorological parameters, at Mar del Plata’s bus station, and the resulting NO2 levels were always below the existing air quality standards.



Quantitative EPR Spin Trapping. 1. Nitrogen Dioxide Radicals and Nitrite Ions from Energetic Materials in Alkaline Aqueous Solution

A new application of electron paramagnetic resonance (EPR) spin trapping is described using the nitromethane aci anion (CH2NO2-) spin trapping technique for quantitative measurement of nitrogen

X‐band ESR spectrum of nitrogen dioxide

The ESR spectrum of gaseous NO2 has been studied experimentally over the pressure range 0.05–10 torr at X band for a range of polarizing magnetic field 1.5–8 kG. The spectra are interpreted by a

Colorimetric Microdetermination of Nitrogen Dioxide in Atmosphere

The determination of nitrogen dioxide in the atmosphere has heretofore been hampered by difficulties in sample absorption and lack of specificity. A new specific reagent has been developed and

Comment on conversion of nitric oxide into a nitroxide radical using 2,3-dimethylbutadiene and 2,5-dimethylhexadiene

ESR spectroscopic evidence is given to suggest that NO2 initiates radical formation instead of the previously assumed ring-closure mechanism in the reaction of nitric oxide with

Novel reactions of nitric oxide in biological systems

The reaction between nitric oxide and the naturally occurring carotenoid β-carotene is shown by EPR and optical spectroscopy to produce a series of nitroxides with concomitant loss in conjugation of

Standard methods for the examination of water and waste water.

  • F. W. Gilcreas
  • Environmental Science
    American journal of public health and the nation's health
  • 1966
Alkalinity measurements are used in the interpretation and control of water and wastewater treatment processes and can be interpreted in terms of specific substances only when the chemical composition of the sample is known.

Is our knowledge about the chemical and physical properties of DPPH enough to consider it as a primary standard for quantitative EPR spectrometry

The knowledge about the physico-chemical properties of the stable free radical DPPH as a primary standard for the Quantitative EPR spectrometry is summarized. It is shown how to calibrate DPPH in

Aquacobalamin (vitamin B12a) does not bind NO in aqueous solution. Nitrite impurities account for observed reaction.

A careful study of the system has revealed that there is no reaction between aquacobalamin and NO, and the observed reaction is due to the presence of nitrite impurities in aqueous solutions of NO, which react with Aquacobalamine to produce the nitrite complex.

Electron spin resonance: A comprehensive treatise on experimental techniques

s phase i (b) Small bias causes matched energy levels (resonance The spin polarized electrons may be detected by a nickel-iron ferromagnetic layer adjacent to the semiconductor. [DDA] [RCJ2] It has