Research Center of Environmental Trace Toxic Substances, National Cheng-Kung University, No.1, University Road, Tainan City, 701, Taiwan.
Department of Earth Sciences, National Cheng-Kung University, No.1, University Road, Tainan City, 701, Taiwan.
Environ Sci Pollut Res Int. 2019 Sep;26(26):27353-27361. doi: 10.1007/s11356-019-05952-y. Epub 2019 Jul 19.
The objective of this study was to investigate whether δC values can be used to identify pollen specie in the atmosphere. A Burkard 7-day recording volumetric spore trap was used to collected pollens in the atmosphere in Tainan City, Taiwan, from January 2 to December 28, 2006, and a light microscope was used to identify the pollen species and concentrations. A Burkard cyclone sampler was used to collect particulate matter and an elemental analyzer with an isotope ratio mass spectrometer was used to analyze the δC values. Our data showed that the predominate pollen specie in the atmosphere was Broussonetia papyrifera pollen and that the annual average concentration was 27 grains/m (pollen season, 36; nonpollen season, 9 grains/m). The average δC value was - 26.19‰ for particulate matter in the atmosphere (pollen season, - 26.00‰; nonpollen season, - 26.28‰). No significant association was observed between δC values and Broussonetia papyrifera pollen concentrations. However, the δC value in the atmosphere was associated with the levels of Broussonetia papyrifera pollen among the samples with a diameter of particulate matter smaller than 10 μm at a level lower than 40 μg/m. In addition, the relative contribution of Broussonetia papyrifera pollen to the carbon in the atmosphere using a two end-member mixing models was found to be associated with the Broussonetia papyrifera pollen concentration. In summary, our study suggested that δC values can be applied in the assessment of Broussonetia papyrifera pollen specie under specific conditions in the atmosphere.
本研究旨在探讨 δC 值是否可用于鉴定空气中的花粉种类。2006 年 1 月 2 日至 12 月 28 日，采用 Burkard 7 天记录容量式孢子捕捉器在台湾台南市采集空气中的花粉，并用光学显微镜鉴定花粉种类和浓度。采用 Burkard 旋风采样器采集颗粒物，用元素分析仪与同位素质谱仪分析 δC 值。我们的数据显示，空气中主要的花粉种类为构树花粉，年平均浓度为 27 粒/米³（花粉季节 36 粒/米³，非花粉季节 9 粒/米³）。大气颗粒物的平均 δC 值为-26.19‰（花粉季节为-26.00‰，非花粉季节为-26.28‰）。未观察到 δC 值与构树花粉浓度之间存在显著相关性。然而，在直径小于 10μm、浓度低于 40μg/m 的颗粒物样本中，大气 δC 值与构树花粉水平呈正相关。此外，利用双端元混合模型计算大气中构树花粉的碳相对贡献与构树花粉浓度有关。综上所述，本研究表明，在特定条件下，δC 值可应用于大气中构树花粉种类的评估。
