Recovery of Odorants from an Olfactometer Measured by Proton-Transfer-Reaction Mass Spectrometry

Hansen, Martin N.; Adamsen, Anders Peter S.; Feilberg, Anders

doi:10.3390/s130607860

Cited by 28 publications

(21 citation statements)

References 20 publications

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“…Post reaction samples were analyzed by ion chromatography (IC). R3N and NH3 gas molecules and aminium ions in solution tend to adsorb on surfaces (Dawson et al, 2014;Hansen et al, 2013;Robacker and Bartelt, 1996). To ensure accuracy of the gas ratio, measures were taken including conditioning the setup for a prolonged period, separating RH conditioning cells and reaction cells.…”

Section: Methodsmentioning

confidence: 99%

Heterogeneous uptake of ammonia and dimethylamine into sulfuric and oxalic acid particles

Sauerwein¹,

Chan²

2016

Preprint

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Abstract. Heterogeneous uptake is one of the major mechanisms governing the amounts of short-chain alkyl-amines and ammonia (NH3) gases resident in atmospheric particles. Molar ratios of aminium to ammonium ions detected in ambient aerosols often exceed typical gas phase ratios. The present study investigated the simultaneous uptake of dimethylamine (DMA) and NH3 into sulfuric and oxalic acid particles at gaseous DMA/NH3 molar ratios of 0.1 and 0.5 at 10&#8201;%, 50&#8201;%, and 70&#8201;% relative humidity (RH). Single gas uptake and co-uptake were conducted under identical conditions and compared. Results showed that the particulate dimethyl-aminium/ammonium molar ratios (DMAH/NH4) changed substantially during the uptake process, which was predominantly influenced by the extent of neutralization and the particle phase state. DMA uptake and NH3 uptake into concentrated H2SO4 droplets were initially similarly efficient, yielding DMAH/NH4 that were similar to DMA/NH3 ratios. As the co-uptake continued the DMAH/NH4 gradually dropped due to a preferential uptake of NH3 into still acidic droplets. Once the droplets were neutralized, the stronger base DMA displaced some of the ammonium absorbed earlier, leading to DMAH/NH4 that were up to four times higher than the corresponding gas phase ratios. At 10&#8201;%&#8201;RH, crystallization of partially neutralized sulfate particles prevented further DMA uptake, while NH3 uptake continued, and displaced DMAH+ after the solid particles were completely neutralized, forming almost pure ammonium sulfate. Displacement of DMAH+ by NH3 has also been observed in neutralized, solid oxalate particles. The results illustrate why in ambient liquid aerosols the DMAH/NH4 can be larger than DMA/NH3, despite of an excess of NH3 in the gas phase; the uptake of DMA to aerosols consisting of crystalline ammonium salts, however is unlikely, even if the gas concentrations of DMA and NH3 are of the same magnitude.

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Section: Methodsmentioning

confidence: 99%

Heterogeneous uptake of ammonia and dimethylamine into sulfuric and oxalic acid particles

Sauerwein¹,

Chan²

2016

Preprint

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“…Losses by the olfactometer were quantified to be 9e21% (DMS), 27e35% (methanethiol) and 55e60% (H 2 S). Hansen et al (2013) investigated the laboratory TO8 olfactometer and found high recoveries for dimethyl sulphide (100%) and n-butanol (90e95%), but for acetic acid, propanoic acid, butanoic acid, methanethiol and trimethylamine recoveries were lower (20%e85%) and also depended on dilution level.…”

Section: Scentroidmentioning

confidence: 98%

Evaluation of the performance of field olfactometers by selected ion flow tube mass spectrometry

Walgraeve

Huffel

Bruneel

et al. 2015

Biosystems Engineering

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“…An important limitation to many existing techniques for measuring ammonia and amines is deposition of the gasphase analyte onto instrument surfaces prior to measurement, which varies with the compound (Hansen et al, 2013). Also, it has recently been shown that amines are irreversibly taken up onto surfaces that have been exposed to a gas-phase acid, forming a non-volatile salt (Nishino et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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Abstract. Ammonia 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 gasphase 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.

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Recovery of Odorants from an Olfactometer Measured by Proton-Transfer-Reaction Mass Spectrometry

Cited by 28 publications

References 20 publications

Heterogeneous uptake of ammonia and dimethylamine into sulfuric and oxalic acid particles

Heterogeneous uptake of ammonia and dimethylamine into sulfuric and oxalic acid particles

Evaluation of the performance of field olfactometers by selected ion flow tube mass spectrometry

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

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