Chemistry: analytical and immunological testing – Nitrogen containing – Nitrite or nitrate
Patent
1996-06-04
1998-12-29
Achutamurthy, Ponnathapura
Chemistry: analytical and immunological testing
Nitrogen containing
Nitrite or nitrate
436100, 436113, 436148, 422 55, 422 61, 422 83, 422 88, 422 93, 55270, 55485, 55486, 95285, G01N 3300, B01D 4600
Patent
active
058540776
ABSTRACT:
A method for continuously measuring particulate nitrate in a gas sample, comprising the steps of passing the gas sample through an inertial impactor with a 50% cut off at 2.5 microns, removing ambient pollutant gases from the gas with diffusion denuders, passing the gas through a first path so as to contact the gas with a coated filter so as to convert particulate nitrate to nitric acid vapor or passing the gas through a second path so as to contact the gas with coated filters to trap particulate nitrate and ammonia, and measuring nitric acid vapor and residual ambient pollutant gases produced from the first path and residual ambient pollutant gases produced from the second path with a chemiluminescent monitor, the difference in the signal produced from the gases from the two paths being a measurement of the particulate nitrate in the gas sample.
REFERENCES:
Brauer et al., "Measurements of Nitrous Acid Inside Two Research Houses," Environmental Science & Technology 24:1521-1527 (1990).
Koutrakis et al., "Evaluation of an Annular Denuder/Filter Pack System to Collect Acidic Aerosols and Gases," Environmental Science & Technology 22:1463-146 (1988).
Klockow et al., "Determination of Nitric Acid and Ammonium Nitrate by Means of Computer Controlled Thermodenuder System," Atmospheric Environment 23:1131-1138 (1989).
Koutrakis et al., "Determination of Aerosol Strong Acidity Losses Due to Interactions of Collected Particles: Results From Laboratory and Field Studies," Atmospheric Environment 26A:987-995 (1992).
Wendt et al., "Continuous monitoring of atmospheric nitric oxide and nitrogen dioxide by chemiluminescence," in Methods of Air Sampling and Analysis, J.P. Lodge Jr. editor, Lewis Publishers, Chelsea, Michigan, pp. 415-421 (1989).
Koutrakis Petros
Wolfson Jack Mikhail
Achutamurthy Ponnathapura
Ponnaluri P.
President and Fellows of Harvard College
LandOfFree
Continuous measurement of particulate nitrate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous measurement of particulate nitrate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous measurement of particulate nitrate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1423890