Determination of methylamines and trimethylamine-N-oxide in particulate matter by non-suppressed ion chromatography |
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| Authors: | Mark E. Erupe Allegra Liberman-Martin Philip J. Silva Quentin G.J. Malloy Naomi Yonis David R. Cocker III Kathleen L. Purvis-Roberts |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, 0300 Old Main Hill, Utah State University, Logan, UT 84322-0300, USA;2. Joint Science Department of Claremont McKenna, Pitzer, and Scripps Colleges, W.M. Keck Science Center, 925 N. Mills Ave., Claremont, CA 91711, USA;3. USDA-ARS, 230 Bennett Lane, Bowling Green, KY 42104, USA;4. Department of Chemical and Environmental Engineering and College of Engineering, Center for Environmental Research and Technology (CE-CERT), University of California, Riverside, CA 92521, USA |
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| Abstract: | An ion chromatography method with non-suppressed conductivity detection was developed for the simultaneous determination of methylamines (methylamine, dimethylamine, trimethylamine) and trimethylamine-N-oxide in particulate matter air samples. The analytes were well separated by means of cation-exchange chromatography using a 3 mM nitric acid/3.5% acetonitrile (v/v) eluent solution and a Metrosep C 2 250 (250 mm × 4 mm i.d.) separation column. The effects of the different chromatographic parameters on the separation were also investigated. Detection limits of methylamine, dimethylamine, trimethylamine, and trimethylamine-N-oxide were 43, 46, 76 and 72 μg/L, respectively. The relative standard deviations of the retention times were between 0.42% and 1.14% while the recoveries were between 78.8% and 88.3%. The method is suitable for determining if methylamines and trimethylamine-N-oxide are a significant component of organic nitrogen aerosol in areas with high concentration of these species. |
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| Keywords: | Non-suppressed ion chromatography Trimethylamine-N-oxide Aerosols Alkylamines Organic nitrogen |
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