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Sampling artifact estimates for alkanes, hopanes, and aliphatic carboxylic acids

机译：烷烃，hop烷和脂肪族羧酸的采样假象估计

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摘要

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).
机译：作为东北氧化剂和颗粒物研究（NEOPS）的一部分，通过分析在费城收集的41个样品，研究了来自颗粒物有机形态的分子标记物的取样假象。使用具有两个串联的石英纤维过滤器的高容量取样器收集样品。通过气相色谱-质谱法（GCMS）分析正构烷烃（C23-C31），hop烷（C27-C31）和正链烷酸（C10-C22）。伪影误差的程度取决于蒸气压和物质浓度。颗粒有机物分为以下三类：（1）备用过滤器上收集的量通常是前部过滤器（正烷烃C23和C24，正羧酸C10-C14）收集量的很大一部分。 ; （2）在备用过滤器上收集的量始终是在前部过滤器上收集的量的一小部分（正构烷烃C25-C28，hop烷C27-C30，正羧酸C15-C18和二羧酸C3-C9 ）; （3）在备用过滤器（正构烷烃C29-C31，hop烷C31和C32）上很少观察到该物种。

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