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United States Department of Agriculture

Agricultural Research Service

Title: Concentration of Methylamine and Ethylamine Salts measured by a particle into liquid sampler and Ion Chromatography

item Praske, Eric
item Shattuck, Morgan
item Purvis-roberts, Katie
item Silva, Philip - Phil
item Tang, Xiaochen
item Cocker, David

Submitted to: American Chemical Society National Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 12/15/2010
Publication Date: 3/30/2011
Citation: Praske, E., Shattuck, M., Purvis-Roberts, K., Silva, P.J., Tang, X., Cocker, D.R. 2011. Concentration of Methylamine and Ethylamine Salts measured by a particle into liquid sampler and Ion Chromatography. American Chemical Society National Meeting. Abstract Only.

Interpretive Summary:

Technical Abstract: A Particle-Into-Liquid Sampler (PILS) and ion chromatographs (ICs) were used to detect the concentration of methylamine salts associated with atmospheric particulate matter reactions in a smog chamber. The smog chamber is located at U.C. Riverside’s College of Engineering Center for Environmental Research and Technology (CE-CERT). The purpose of the experiments was to determine how amine salts are incorporated into particulate matter pollution through oxidation at varying levels of humidity. Oxidation was performed by ozone and NOx, N2O5, or the hydroxyl radical. Alkyl amines analyzed included methylamine (MA), dimethylamine (DMA), trimethylamine (TMA), and trimethylamine-N-oxide. The ICs were calibrated to detect the target alkyl amines, and the concentrations were measured in real-time for a set of experiments. N2O5 was the fastest oxidant and produced the greatest concentration of amine salts. Amine salt production increased substantially in low humidity experiments with N2O5. This was not the case, however, with the hydroxyl radical, which exhibited zero amine salt formation under low humidity with TMA. Higher humidity studies did not work well in the smog chamber, and an insignificant quantity of amine salts was observed. Current research is concentrated on butylamine and filter samples will be collected from CE-CERT and analyzed using the ICs. More chamber experiments will be conducted in the summer of 2011 looking at other amines that have been observed in ambient air sampling.

Last Modified: 10/19/2017
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