In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 103, No. D17 ( 1998-09-20), p. 22295-22316
Abstract:
Simultaneous measurements of oxygenated volatile organic compounds (OVOCs) by four independent research groups at the Youth Incorporated (YI) site during the 1995 Southern Oxidants Study Nashville Intensive, between July 4 and 30, 1995, provided a unique opportunity to compare results from different techniques. 2,4‐Dinitrophenylhydrazine (DNPH) coated C18 (C18 AtmAA ) and Si‐Gel (Si‐Gel MTE ) cartridges were compared with each other and with two sorbent‐based preconcentration gas chromatographic (GC) techniques coupled with mass spectrometric (MS) detection (GC/MS UM and GC/MS PU ) or flame ionization detection GC/FID UM · The experiment consisted of both a laboratory (part A) and an ambient air comparison (part B). In part A of the study, standard mixtures of OVOCs were diluted in a flowing gas stream of humidified, purified air, both with and without addition of O3, and distributed to participant's instrumentation. Concentrations were compared with the expected values based on known cylinder concentrations and dilution factors. In part B of the study, the instruments sampled ambient air from a common glass manifold. Species intercompared were formaldehyde, acetaldehyde, acetone, and propanal. The C18 AtmAA data were typically higher than the Si‐Gel MTE data for the four intercompared compounds, and possible explanations are given. Agreement between the cartridge systems and the GC/MS, GC/FID systems for comeasured compounds was poorer than expected but improved towards the end of the experiment. The GC/MS systems tracked each other well for acetone, but there were differences in the absolute concentration values. These results show that improvements in the accuracy and comparability of techniques should be of high priority.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1998
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