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Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids
AbstractSampling artifacts for molecular markers from organic speciation of particulate matter were investigated by analyzing forty-one samples collected in Philadelphia as a part of the Northeast Oxidant and Particulate Study (NEOPS). Samples were collected using a high volume sampler with two quartz fiber filters in series. n-Alkanes (C23–C31), hopanes (C27–C31), and n-alkanoic acids (C10–C22) were analyzed by gas chromatography-mass spectrometry (GCMS). The extent of artifact error was dependent on vapor pressure and species concentration. Particulate organic species are classified into the following three categories: (1) the amount collected on the backup filter was often a large fraction of the amount collected on the front filters (n-alkanes C23 and C24, n-carboxylic acids C10–C14); (2) the amount collected on the backup filter was consistently a small fraction of the amount collected on the front filter (n-alkanes C25–C28, hopanes C27–C30, n-carboxylic acids C15–C18, and dicarboxylic acids C3–C9); (3) the species was rarely observed on backup filters (n-alkanes C29–C31, hopanes C31 and C32).
Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids
AbstractSampling artifacts for molecular markers from organic speciation of particulate matter were investigated by analyzing forty-one samples collected in Philadelphia as a part of the Northeast Oxidant and Particulate Study (NEOPS). Samples were collected using a high volume sampler with two quartz fiber filters in series. n-Alkanes (C23–C31), hopanes (C27–C31), and n-alkanoic acids (C10–C22) were analyzed by gas chromatography-mass spectrometry (GCMS). The extent of artifact error was dependent on vapor pressure and species concentration. Particulate organic species are classified into the following three categories: (1) the amount collected on the backup filter was often a large fraction of the amount collected on the front filters (n-alkanes C23 and C24, n-carboxylic acids C10–C14); (2) the amount collected on the backup filter was consistently a small fraction of the amount collected on the front filter (n-alkanes C25–C28, hopanes C27–C30, n-carboxylic acids C15–C18, and dicarboxylic acids C3–C9); (3) the species was rarely observed on backup filters (n-alkanes C29–C31, hopanes C31 and C32).
Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids
Sihabut, Tanasri (author) / Ray, Joshua (author) / Northcross, Amanda (author) / McDow, Stephen R. (author)
Atmospheric Environment ; 39 ; 6945-6956
2005-02-28
12 pages
Article (Journal)
Electronic Resource
English
Adsorption Energies of Aliphatic Carboxylic Acids on the Al(110) Plane
| British Library Online Contents | 1994