Laser photoacoustic detection of nitrogen dioxide in the gas-phase titration of nitric oxide with ozone

Fried, Alan; Hodgeson, Jimmie A.

doi:10.1021/ac00239a030

Cited by 16 publications

(9 citation statements)

References 7 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar calculations and experimental checks were performed at 250 K and 350 K. While the NO2 limits are somewhat more conservative at these temperature extremities than at 296 K we are able to place, at most a 5% uncertainty on our complete set of measurements due to the reaction of OH with NO2. This upper limit on NO2 impurity levels in our reaction mixtures was confirmed by actual measurements on similarly prepared samples using optoacoustic detection of NO2 upon irradiation by an argon ion laser at 488.0 nm [Fried and Hodgeson, 1982]. Thus any differences between the present work and the earlier (temperature invarient) studies cannot be attributed to NO2 (either as an initial impurity or generated by HONO2 decomposition).…”

Section: The Initial 296 K Experiments Performed With the Large Teflsupporting

confidence: 59%

The temperature dependence of the rate constant for the reaction of hydroxyl radicals With nitric acid

Kurylo¹,

Cornett²,

Murphy³

1982

J. Geophys. Res.

View full text Add to dashboard Cite

The flash photolysis resonance fluorescence technique has been used to measure the rate constant for the reaction products over the temperature range 225–443 K. The data below room temperature can be fit to the expression k1 = (1.05±0.40) × 1014 exp [(759±100)/T] cm3 molec−1 S−1. This equation, however, markedly underestimates the values of k1 above 300 K. An interpretation of the behavior is presented, and implications of these values for k1 on stratospheric reaction cycles are discussed.

show abstract

Section: The Initial 296 K Experiments Performed With the Large Teflsupporting

confidence: 59%

The temperature dependence of the rate constant for the reaction of hydroxyl radicals With nitric acid

Kurylo¹,

Cornett²,

Murphy³

1982

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Several other investigators reported significant biases between GPT and UV photometry. Higher O 3 values assayed by GPT than by UV photometry have often been observed [ Hodgeson , 1976; Rehme et al , 1981; Fried and Hodgeson , 1982]. For example, Fried and Hodgeson [1982] conducted a 1‐year study of GPT in comparison with UV absorption measurements of O 3 .…”

Section: Discussionmentioning

confidence: 99%

“…This minimizes the possibility of side reactions involving NO 2 , NO 3 , and N 2 O 5 that might occur if conditions of excess O 3 were used. Having one of the reactants in excess, rather than say having NO and O 3 at equivalent levels, will also tend to drive the reaction to completion, allowing us to take advantage of the stoichiometry of the following reaction [e.g., DeMore and Patapoff , 1976; Fried and Hodgeson , 1982]. …”

Section: Methodsmentioning

confidence: 99%

Intercomparison of ultraviolet photometry and gas‐phase titration techniques for ozone reference standards at ambient levels

et al. 2006

View full text Add to dashboard Cite

[1] Intercomparison experiments were made between two independent techniques for ozone (O 3 ) reference standards often used as the primary standards in air quality monitoring networks. These techniques include ultraviolet absorption photometry of O 3 at the 253.7-nm Hg line and gas-phase titration of O 3 with excess NO. For ultraviolet photometry, a well-designed and maintained standard reference photometer (SRP) built by the National Institute of Standards and Technology (USA) was employed. For gas-phase titration (GPT), an existing system was significantly modified by the National Institute for Environmental Studies (Japan) by using gravimetric NO/N 2 standard gases, accurate flow measurement systems based on laminar flow elements, and two chemiluminescence NO detectors to minimize uncertainty in the measurements, which had previously been a major shortcoming of this method. Uncertainty in the improved GPT system was reduced to less than 0.4% above 100 nmol mol À1 O 3 mole fraction. A series of comparison runs between the two methods over the course of 13 months from August 2004 to August 2005 showed a significant discrepancy, which cannot be explained by the measurement uncertainties attributed to either SRP or GPT in the range of 80-800 nmol mol À1 O 3 , where GPT was about 2% higher than SRP. This result indicates possible biases in the currently existing O 3 reference standards and warrants further studies to identify and characterize possible sources of the systematic discrepancy.Citation: Tanimoto, H., H. Mukai, S. Hashimoto, and J. E. Norris (2006), Intercomparison of ultraviolet photometry and gas-phase titration techniques for ozone reference standards at ambient levels,

show abstract

“…The error in the resulting calibration constant is principally driven by the uncertainty in the calibration source mixing ratio and the subsequent passing efficiency of NO 2 through regulators, flow controllers and other tubing. Experiments at the National Institute of Standards and Technology (NIST) have shown agreement to within 1.0% between NO 2 permeation tube standards (Fried & Hodgeson, 1982) (a gravimetric standard exhibiting a combined standard uncertainty of 0.2% at 1 ppm) and the NO 2 cylinder standards commonly used for field calibrations, in this case Scott Specialty Gas, 10 ppm . In our laboratory, NO 2 standards (2-50 ppmv) have been compared to each other regularly over a three-year period.…”

Section: Calibration Of Lif No 2 Instrumentsmentioning

confidence: 99%

Fluorescence Methods

and¹,

Cohen²

2006

Analytical Techniques for Atmospheric Measurement

View full text Add to dashboard Cite

Laser photoacoustic detection of nitrogen dioxide in the gas-phase titration of nitric oxide with ozone

Cited by 16 publications

References 7 publications

The temperature dependence of the rate constant for the reaction of hydroxyl radicals With nitric acid

The temperature dependence of the rate constant for the reaction of hydroxyl radicals With nitric acid

Intercomparison of ultraviolet photometry and gas‐phase titration techniques for ozone reference standards at ambient levels

Fluorescence Methods

Contact Info

Product

Resources

About