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Detection and quantification of 2-methyltetrols in ambient aerosol in the southeastern United States

机译：在美国东南部的环境气溶胶中检测和定量2-甲基四醇

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Filters collected from the Southeastern Aerosol Research and Characterization (SEARCH) air monitoring network were analyzed for the presence of 2-methyltetrols, namely 2-methylthreitol and 2-methylerythritol, two compounds that are products of the photooxidation of isoprene and have been detected in aerosol at a variety of sites around the globe. The 2-methytetrols were detected in ambient filter samples collected at the four SEARCH sites, Birmingham, AL, Centreville, AL, Pensacola, FL, and at Jefferson Street in Atlanta, GA, in late June 2004. Average atmospheric concentrations of 11.9 and 4.8 ng m~(-3) were measured for 2-methylerythritol and 2-methylthreitol, respectively, at the inland sampling sites, whereas average concentrations of 4.9 and 1.6 ng m~(-3) were measured at the coastal sampling location (Pensacola). On average, the aerosol loading from these two compounds accounts for approximately 0.42% and 0.21 % of the organic mass collected on a given sampling day at the inland and coastal sites, respectively. The present data on these compounds, which are particulate-phase fingerprints of isoprene photooxidation, add to the growing body of ambient data on secondary organic aerosol from isoprene.
机译：分析了从东南气溶胶研究与表征（SEARCH）空气监测网络收集的过滤器中是否存在2-甲基四醇，即2-甲基苏糖醇和2-甲基赤藓糖醇，这两种化合物是异戊二烯的光氧化产物，已在气溶胶中检测到在全球各地2004年6月下旬，在四个SEARCH站点（阿拉巴马州伯明翰，阿拉巴马州彭萨科拉和佛罗里达州佐治亚州杰斐逊街）的四个SEARCH站点收集的环境过滤器样本中检测到了2-甲基苯酚。平均大气浓度为11.9和4.8在内陆采样点分别测量了2-甲基赤藓糖醇和2-甲基苏糖醇的ng m〜（-3），而在沿海采样点（Pensacola）分别测量了4.9和1.6 ng m〜（-3）的平均浓度。 。平均而言，在给定的采样日内陆和沿海地点，这两种化合物的气溶胶负载量分别约占有机物质量的0.42％和0.21％。这些化合物的当前数据是异戊二烯光氧化的颗粒相指纹，这增加了关于异戊二烯二次有机气溶胶的环境数据的增长。

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