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Measurement of gas-phase ammonia and amines in air by collection onto an ion exchange resin and analysis by ion chromatography

Measurement of gas-phase ammonia and amines in air by collection onto an ion exchange resin and analysis by ion chromatographyAtmospheric Measurement Techniques, 7, 2733-2744, 2014Author(s): M. L. Dawson, V. Perraud, A. Gomez, K. D. Arquero, M. J. Ezell, and B. J. Finlayson-PittsAmmonia and amines are common trace gases in the atmosphere and have a
variety of both biogenic and anthropogenic sources, with a major contribution
coming from agricultural sites. In addition to their malodorous nature, both
ammonia and amines have been shown to enhance particle formation from acids
such as nitric, sulfuric and methanesulfonic acids, which has implications
for visibility, human health and climate. A key component of quantifying the
effects of these species on particle formation is accurate gas-phase
measurements in both laboratory and field studies. However, these species are
notoriously difficult to measure as they are readily taken up on surfaces,
including onto glass surfaces from aqueous solution as established in the
present studies. We describe here a novel technique for measuring gas-phase
ammonia and amines that involves uptake onto a weak cation exchange resin
followed by extraction and analysis using ion chromatography. Two variants –
one for parts per billion concentrations in air and the second with lower (parts per trillion) detection
limits – are described. The latter involves the use of a custom-designed
high-pressure cartridge to hold the resin for in-line extraction. These
methods avoid the use of sampling lines, which can lead to significant inlet
losses of these compounds. They also have the advantages of being relatively
simple and inexpensive. The applicability of this technique to ambient air is
demonstrated in measurements made near a cattle farm in Chino, CA.

Atmospheric Measurement Techniques 2014/08/26 - 18:40 Czytaj