Nitrogen dioxide determination

Linn, W.S., and J.D.Hackney. 1983. Short-Term Human Respiratory Effects of Nitrogen Dioxide Determination of Quantitative Dose-Response Profiles. Phase 1. Exposure of Healthy Volunteers to 4 ppm N02. CRC-CAPM-48-83.(l-82). Final Report. Rancho Los Amigos Hospital, Inc., Downey, CA. NTIS PB84-132299. 30 pp. 

Linn, W.S., and J.D.Hackney. 1984. Short-Term Human Respiratory Effects of Nitrogen Dioxide Determination of Quantitative Dose-Response Profiles. Phase 2. 

Y. Wei, M. Oshima, J. Simon, LJ4. Moskvin, S. Motomizu, Absorption, concentration and determination of trace amounts of air pollutants by flow injection method coupled with a chromatomembrane cell system application to nitrogen dioxide determination, Talanta 58 (2002) 1343-1355. 

Shooter, D. Nitrogen Dioxide and Its Determination in the Atmosphere, /. Chem. Educ. 1993, 70, A133-A140. 

Low temperatures strongly favor the formation of nitrogen dioxide. Below 150°C equiUbrium is almost totally in favor of NO2 formation. This is a slow reaction, but the rate constant for NO2 formation rapidly increases with reductions in temperature. Process temperatures are typically low enough to neglect the reverse reaction and determine changes in NO partial pressure by the rate expression (40—42) (eq. 13). The rate of reaction, and therefore the... 

The NO analyzer is based on the principles of chemiluminescence to determine continuously the NO concentration in the sample gas stream. The analyzer should contain a NOg-to-NO converter, which converts the nitrogen dioxide (NO9) in the sample gas to nitrogen oxide (NO). An NOg-to-NO converter is not necessary if data are presented to demonstrate that the NO9 portion of the exhaust gas is less than 5 percent of the total NO9 concentration. 

What wavelength band of solar radiation leads to photodissoaation for nitrogen dioxide What determines the lower limit ... 

Inhaled gaseous compounds are absorbed in all parts of the respiratory system whereas particle size determines how deep into the airways the parti cles will he transported in the airstrearn. Shortness of breath is a typical sign of a chemical exposure that has affected the lungs, and it may be evoked through iminunological mechanisms (e.g., formaldehyde, ethyleneoxide), or through toxic irritation (formaldehyde, isocyanates, sulfur dioxide, nitrogen dioxide, Frequently the mechanism depends on the concentration ol the com... 

The kinetics of the gas-phase reaction between nitrogen dioxide (A) and trichloroethene (B) have been investigated by Czamowski (1992) over the range 303-362.2 K. The reaction extent, with the reaction carried out in a constant-volume BR, was determined from measurements of infrared absorption intensities, which were converted into corresponding pressures by calibration. The products of the reaction are nitrosyl chloride, NOC1 (C), and glyoxyloxyl chloride, HC(0)C(0)C1. 

A semiconductor sensor-based instrument was described for determination of the composition and concentrations of vapors of organic nitro compounds and nitrogen dioxide in the atmosphere. Four organic semiconductor sensors [e.g. aluminum phthalocyanine fluoride (222a)] were tested in conjunction with platinized platinum preconcentrators sensitivity is to ppm levels of nitrobenzene450. 

How does the rate-determining step relate to the rate law for the overall equation Consider the reaction of nitrogen dioxide with chlorine. 

By observing the intensity of the brown colour in the mixture, chemists can determine the concentration of nitrogen dioxide. 

Baumgardner, R. E., T. A. Gark, J. A. Hodgeson, and R. K. Stevens. Determination of an ozone interference in the continuous Saltzman nitrogen dioxide procedure. Anal. Chem. 47 515-521, 1975. 

Determination of Ozone in Air by Titration with Nitric Oxide This calibration technique is based on the application of the rapid gas-phase reaction between nitric oxide and ozone to produce a stoichiometric quantity of nitrogen dioxide, according to the following reaction ... 

It appears that the development of tolerance is a useful tool to determine the mechanism of ozone-induced pulmonary edema. However, in the light of the findings that repeated intermittent exposures of mice to nitrogen dioxide produced less protection from the effects of a lethal dose... 

Kagawa and Toyama in Tokyo followed 20 normal 11-yr-old school children once a week from June to December 1972 with a battery of pulmonary-function tests. Environmental factors studied included oxidant, ozone, hydrocarbon, nitric oxide, nitrogen dioxide, sulfur dioxide, particles, temperature, and relative humidity. Temperature was found to be the most important environmental factor affecting respiratory tests. The observers noted that pulmonary-function tests of the upper airway were more susceptible to increased temperature than those of the lower airway. Although the effect of temperature was the most marked, ozone concentration was significantly associated with airway resistance and specific airway conductance. Increased ozone concentrations usually occur at the same time as increased temperature, so their relative contributions could not be determined. 

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