Atmospheric measurements of nitrogen dioxide with a sensitive luminol instrument

1986 ◽  
Vol 30 (1-2) ◽  
pp. 105-114 ◽  
Author(s):  
H. I. Schiff ◽  
G. I. Mackay ◽  
C. Castledine ◽  
G. W. Harris ◽  
Q. Tran
Keyword(s):  
Nitrogen Dioxide ◽  
Atmospheric Measurements

Atmospheric Measurements of Nitrogen Dioxide with a Sensitive Luminol Instrument

1986 ◽  
pp. 105-114 ◽  
Author(s):  
H. I. Schiff ◽  
G. I. Mackay ◽  
C. Castledine ◽  
G. W. Harris ◽  
Q. Tran
Keyword(s):  
Nitrogen Dioxide ◽  
Atmospheric Measurements

scholarly journals Folded tubular photometer for atmospheric measurements of NO<sub>2</sub> and NO

2018 ◽  
Vol 11 (5) ◽  
pp. 2821-2835 ◽  
Author(s):  
John W. Birks ◽  
Peter C. Andersen ◽  
Craig J. Williford ◽  
Andrew A. Turnipseed ◽  
Stanley E. Strunk ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Black Carbon ◽  
Direct Measurement ◽  
Dynamic Range ◽  
Measurement Techniques ◽  
Ambient Air ◽  
Atmospheric Measurements ◽  
Direct Measurements ◽  
Path Lengths ◽  
Cell Volumes

Abstract. We describe and characterize a modular folded tubular photometer for making direct measurements of the concentrations of nitrogen dioxide (NO2) and specify how this method could be extended to measure other pollutants such as sulfur dioxide (SO2), ozone (O3), and black carbon particulate matter. Direct absorbance measurements using this photometer can be made across the spectral range from the ultraviolet (UV) to the near infrared. The absorbance cell makes use of modular components (tubular detection cells and mirror cubes) that allow construction of path lengths of up to 2 m or more while maintaining low cell volumes. The long path lengths and low cell volumes enable sensitive detection of ambient air pollutants down to low part-per-billion levels for gas species and aerosol extinctions down to 1 Mm−1, corresponding to ∼ 0.1 µg m−3 for black carbon particulates. Pressure equalization throughout the stages of the absorbance measurement is shown to be critical to accurate measurements of analyte concentrations. The present paper describes the application of this photometer to direct measurements of nitrogen dioxide (NO2) and the incorporation of design features that also enable measurement of nitric oxide (NO) in the same instrument. Excellent agreement for ambient measurements along an urban roadside was found for both NO2 and NO measured by the folded tubular photometer compared to existing standard techniques. Compared to commonly used methods for measurements of NOx species, the advantages of this approach include (1) an absolute quantification for NO2 based on the Beer–Lambert law, thereby greatly reducing the frequency at which calibrations are required; (2) the direct measurement of NO2 concentration without prior conversion to NO as is required for the commonly used chemiluminescence method; (3) the use of modular components that allow construction of absorbance detection cells of varying lengths for extending the dynamic range of concentrations that can be measured; (4) a more economical instrument than other currently available direct measurement techniques for NO2; and (5) the potential for simultaneous detection of additional species such as SO2, O3, and black carbon in the same instrument. In contrast to other commercially available direct NO2 measurements, such as cavity-attenuated phase-shift spectroscopy (CAPS), the folded tubular photometer also measures NO simultaneously in the same apparatus by quantitatively converting NO to NO2 with ozone, which is then detected by direct absorbance.

scholarly journals Folded Tubular Photometer for atmospheric measurements of NO<sub>2</sub> and NO

2018 ◽  
Author(s):  
John W. Birks ◽  
Peter C. Andersen ◽  
Craig J. Williford ◽  
Andrew A. Turnipseed ◽  
Stanley E. Strunk ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Black Carbon ◽  
Direct Measurement ◽  
Air Pollutants ◽  
Measurement Techniques ◽  
Ambient Air ◽  
Atmospheric Measurements ◽  
Direct Measurements ◽  
Path Lengths ◽  
Cell Volumes

Abstract. We describe and characterize a modular Folded Tubular Photometer for making direct measurements of the concentrations of air pollutants such as nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and black carbon particulate matter. Direct absorbance measurements using this photometer can be made across the spectral range from the ultraviolet (UV) to the near-infrared. The absorbance cell makes use of modular components (tubular detection cells and mirror cubes) that allow construction of path lengths of up to 2 meters or more while maintaining low cell volumes. The long path lengths and low cell volumes enable sensitive detection of ambient air pollutants down to low part-per-billion levels for gas species and aerosol extinctions down to 1 Mm−1, corresponding to ~ 0.1 μg m−3 for black carbon particulates. Pressure equalization throughout the stages of the absorbance measurement is shown to be critical to accurate measurements of analyte concentrations. The present paper describes the application of this photometer to direct measurements of nitrogen dioxide (NO2) and the incorporation of design features that also enable measurement of nitric oxide (NO) in the same instrument. Excellent agreement for ambient measurements along an urban roadside was found for both NO2 and NO measured by the Folded Tubular Photometer compared to existing standard techniques. Compared to commonly used methods for measurements of NOx species, the advantages of this approach include 1) an absolute quantification for NO2 based on the Beer-Lambert Law, thereby greatly reducing the frequency at which calibrations are required; 2) the direct measurement of NO2 concentration without prior conversion to NO as is required for the commonly used chemiluminescence method; 3) the use of modular components that allow construction of absorbance detection cells of varying lengths for extending the dynamic range of concentrations that can be measured; 4) a more economical instrument than other currently available direct measurement techniques for NO2; and 5) the potential for simultaneous detection of additional species such as SO2, O3, and black carbon in the same instrument. In contrast to other commercially available direct NO2 measurements, such as cavity-attenuated phase shift spectroscopy (CAPS), the Folded Tubular Photometer provides a means for measuring NO simultaneously in the same apparatus by quantitatively converting NO to NO2 with ozone, which is then detected by direct absorbance.

The Effect of Vitamin A on the Intermittent Nitrogen Dioxide Gas Exposure in Hamsters

1976 ◽  
Vol 34 ◽  
pp. 176-177
Author(s):  
J.C.S. Kim ◽  
M.G. Jourden ◽  
E.S. Carlisle
Keyword(s):  
Electron Microscopy ◽  
Vitamin A ◽  
Nitrogen Dioxide ◽  
Chronic Exposure ◽  
Light And Electron Microscopy ◽  
Specific Effect ◽  
Deficient Diet ◽  
Intermittent Exposure ◽  
Hypovitaminosis A ◽  
Gas Exposure

Chronic exposure to nitrogen dioxide in rodents has shown that injury reaches a maximum after 24 hours, and a reparative adaptive phase follows (1). Damage occurring in the terminal bronchioles and proximal portions of the alveolar ducts in rats has been extensively studied by both light and electron microscopy (1).The present study was undertaken to compare the response of lung tissue to intermittent exposure to 10 ppm of nitrogen dioxide gas for 4 hours per week, while the hamsters were on a vitamin A deficient diet. Ultrastructural observations made from lung tissues obtained from non-gas exposed, hypovitaminosis A animals and gas exposed animals fed a regular commercially prepared diet have been compared to elucidate the specific effect of vitamin A on nitrogen dioxide gas exposure. The interaction occurring between vitamin A and nitrogen dioxide gas has not previously been investigated.

Working conditions of employees of energy enterprises from the position of non-carcinogenic risks

2020 ◽  
pp. 606-606
Author(s):  
O. V. Grebeneva ◽  
A. Z. Shadetova ◽  
M. V. Rusyaev
Keyword(s):  
Nitrogen Dioxide ◽  
Working Conditions ◽  
Respiratory Diseases ◽  
Combined Effects ◽  
Motor Transport ◽  
Dust Aerosols ◽  
Mineral Oils ◽  
Target Organs ◽  
Power Enterprise

The coefficients of danger to health of 84 workers of 4 lowering stations of the power enterprise from inhalation influence of pollutants of motor transport are calculated: nitrogen dioxide, dust, aerosols of mineral oils and hydrocarbons. The risk of combined effects of chemicals on the target organs was determined by an increase in the chance of respiratory diseases by 1.77 times.

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