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首页> 外文期刊>Atmospheric environment >Polar organic compounds measured in fine particulate matter during TexAQS 2000
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Polar organic compounds measured in fine particulate matter during TexAQS 2000

机译：TexAQS 2000期间在细颗粒物中测量的极性有机化合物

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Fine particle samples were collected at three sites in the Houston area during TexAQS 2000. Polar organic species including levoglucosan, n-alkanoic acids, n-alkenoic acids and dicarboxylic acids were quantified to characterize the composition of local ambient organic aerosols. Levoglucosan, a tracer for biomass burning, was measured as a dominant compound, followed by n-alkanoic acids. The compound distribution of higher molecular weight n-alkanoic acids (≥C_(22)) was consistent with biogenic emission sources. n-Alkenoic acids exhibit variable concentrations during sampling period with high ratios of octadecanoic to octadecenoic acid. The concentrations of dicarboxylic acids are compared with unapportioned organic carbon calculated by the chemical mass balancing technique. This correlation supports the conclusion that diacids are generated by photochemical reactions and contribute to the unapportioned organic mass. Data collected during a regional wood smoke episode are used to examine the influence of wood combustion to ambient particulate matter concentrations.
机译：在2000年TexAQS期间，在休斯敦地区的三个地点收集了细颗粒样品。对包括左旋葡聚糖，正链烷酸，正链烯酸和二羧酸在内的极性有机物质进行了定量分析，以表征局部环境有机气溶胶的组成。左旋葡聚糖（一种用于生物质燃烧的示踪剂）被测定为主要化合物，其次是正链烷酸。高分子量正链烷酸（≥C_（22））的化合物分布与生物排放源一致。正烯酸在采样期间表现出可变的浓度，十八烷酸与十八烯酸的比例很高。将二羧酸的浓度与通过化学质量平衡技术计算出的未分配有机碳进行比较。这种相关性支持这样的结论，即二酸是通过光化学反应生成的，并且有助于形成不相称的有机物。在区域木材烟雾事件期间收集的数据用于检查木材燃烧对周围颗粒物浓度的影响。

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