کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4445006 | 1311265 | 2005 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids](/preview/png/4445006.png)
Sampling 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).
Journal: Atmospheric Environment - Volume 39, Issue 37, December 2005, Pages 6945–6956