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A comparison of measurements of atmospheric ammonia by filter packs, transition-flow reactors, simple and annular denuders and fourier transform infrared spectroscopy

Wiebe, H. A. and Anlauf, K. G. and Tuazon, E. C. and Winer, A. M. and Biermann, H. W. and Appel, B. R. and Solomon, P. A. and Cass, G. R. and Ellestad, T. G. and Knapp, K. T. and Peake, E. and Spicer, C. W. and Lawson, D. R. (1990) A comparison of measurements of atmospheric ammonia by filter packs, transition-flow reactors, simple and annular denuders and fourier transform infrared spectroscopy. Atmospheric Environment Part A-General Topics, 24 (5). pp. 1019-1028. ISSN 0960-1686. http://resolver.caltech.edu/CaltechAUTHORS:20160713-101755984

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Abstract

sing data obtained during the 1985 Nitrogen Species Methods Comparison Study (1988,Atmospheric Environment22, 1517), several measurement methods for sampling ambient NH_3 are compared. Eight days of continuous measurements at Pomona College, a smog receptor site in Los Angeles, provided an extensive data base for comparing the following methods: Fourier transform i.r. spectroscopy (FTIR), three filter pack configurations, a simple and an annular denuder, and the transition flow reactor. FTIR was defined as the reference method and it reported hourly NH_3 concentrations ranging from > 60 to 2280 nmol m^(−3) (1.5−57ppb) during the course of the study, the highest values coming from the influence of nearby livestock operations. Although only limited quality assurance procedures were carried out, the following conclusions can, nevertheless, be drawn: most of the methods correlated highly with the FTIR method (correlation coefficientr > 0.96); generally, the linear regression slopes were close to unity and the intercepts were insignificantly different from zero at the 95% confidence level); relative to the FTIR average values, (1) for 4–6 h sampling periods, the averages of the three filter packs from three research groups were 83–130% and the annular denuder average was 87%, and (2) for 10–12 h sampling periods, the simple denuder averaged 90% and the two transition flow reactors were 77–98%. Possible reasons for the reported systematic biases are presented, but these are not able to fully explain the large range of differences reported by the various methods.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0960-1686(90)90070-4DOIArticle
http://www.sciencedirect.com/science/article/pii/0960168690900704PublisherArticle
Additional Information:© 1990 Pergamon Press. First received 1 April 1989 and in final form 11 September 1989. We acknowledge the financial support of the California Air Resources Board, the U.S. Environmental Protection Agency and the Atmospheric Environment Service (Canada) for making this study possible. We also thank Prof. C. Freeman Allen and Mr John Giboney of Pomona College for their help and cooperation in providing space and facilities to carry out the study, and the Southern California Edison Company for providing electric power at the site. The mention of commercial products, their source or use in connection with material reported herein is not construed as an actual or implied endorsement of such products.
Group:Environmental Quality Laboratory
Funders:
Funding AgencyGrant Number
California Air Resources BoardUNSPECIFIED
Environmental Protection Agency (EPA)UNSPECIFIED
Atmospheric Environment Service (Canada)UNSPECIFIED
Subject Keywords:Eggenberger-Polya distributions; dispersion modelling; frequency distribution
Record Number:CaltechAUTHORS:20160713-101755984
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160713-101755984
Official Citation:H.A. Wiebe, K.G. Anlauf, E.C. Tuazon, A.M. Winer, H.W. Biermann, B.R. Appel, P.A. Solomon, G.R. Cass, T.G. Ellestad, K.T. Knapp, E. Peake, C.W. Spicer, D.R. Lawson, A comparison of measurements of atmospheric ammonia by filter packs, transition-flow reactors, simple and annular denuders and fourier transform infrared spectroscopy, Atmospheric Environment. Part A. General Topics, Volume 24, Issue 5, 1990, Pages 1019-1028, ISSN 0960-1686, http://dx.doi.org/10.1016/0960-1686(90)90070-4. (http://www.sciencedirect.com/science/article/pii/0960168690900704)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68996
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Jul 2016 20:19
Last Modified:26 Jul 2016 20:19

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