| Heterogeneous Uptake of Amines by Citric Acid and Humic Acid. | |
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MedLine Citation:
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PMID: 22963339 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Heterogeneous uptake of methylamine (MA), dimethylamine (DMA), and trimethylamine (TMA) onto citric acid and humic acid was investigated using a Knudsen cell reactor coupled to a quadrupole mass spectrometer at 298 K. Acid-base reactions between amines and carboxylic acids were confirmed. The observed uptake coefficients of MA, DMA, and TMA on citric acid at 298 K were measured to be 7.31±1.13×10-3, 6.65±0.49×10-3, and 5.82±0.68×10-3, respectively, and showed independence of sample mass. The observed uptake coefficients of MA, DMA, and TMA on humic acid at 298 K increased linearly with sample mass, and the true uptake coefficients of MA, DMA, and TMA were measured to be 1.26±0.07×10-5, 7.33±0.40×10-6, and 4.75±0.15×10-6, respectively. Citric acid, having stronger acidity, showed a higher reactivity than humic acid for a given amine; while the steric effect of amines was found to govern the reactivity between amines and citric acid or humic acid. |
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Authors:
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Yongchun Liu; Qingxin Ma; Hong He |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-9-10 |
Journal Detail:
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Title: Environmental science & technology Volume: - ISSN: 1520-5851 ISO Abbreviation: Environ. Sci. Technol. Publication Date: 2012 Sep |
Date Detail:
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Created Date: 2012-9-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0213155 Medline TA: Environ Sci Technol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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