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Determination of the carbon content of airborne fungal spores

机译:空气传播真菌孢子中碳含量的测定

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Airborne fungal spores contribute potentially to the organic carbon of the atmospheric aerosol, mainly in the "coarse aerosol" size range 2.5-10 mum aerodynamic equivalent diameter (aed). Here, we report about a procedure to determine the organic carbon content of fungal spores frequently observed in the atmosphere. Furthermore, we apply a new (carbon/individual) factor to quantify the amount of fungal-spores-derived organic carbon in aerosol collected at a mountain site in Austria. Spores of representatives of Cladosporium sp., Aspergillus sp., Penicillium sp., and Alternaria sp., the four predominant airborne genera, were analyzed for their carbon content using two different analytical procedures. The result was an average carbon content of 13 pg C/spore (RSD, 46%), or expressed as a carbon-per-volume ratio, 0.38 pg C/mum(3) (RSD, 30%). These values are comparable to conversion factors for bacteria and some representatives of the zooplankton. Because biopolymers are suspected of interfering with elemental carbon determination by thermal methods, the amount of "fungal carbon" that might be erroneously mistaken for soot carbon was determined using the "two-step combustion" method of Cachier et al.(1) and termed as "apparent elemental carbon" (AEC). This fraction amounted to up to 46% of the initial fungal carbon content. Although the aerosol samples were collected in March under wintry conditions, the organic carbon from fungal spores amounted to 2.9-5.4% of organic carbon in the "coarse mode" size fraction. [References: 34]
机译:空气中的真菌孢子可能对大气气溶胶中的有机碳有潜在贡献,主要是在“粗气溶胶”尺寸范围为2.5-10毫米空气动力学当量直径(aed)的情况下。在这里,我们报告有关确定大气中经常观察到的真菌孢子有机碳含量的程序。此外,我们应用了一个新的(碳/单个)因子来量化在奥地利山区从气溶胶中收集到的真菌孢子衍生的有机碳的量。使用两种不同的分析方法分析了四个主要的空气传播属:角孢属,曲霉属,青霉属和链格孢属的代表孢子的碳含量。结果是平均碳含量为13 pg C /孢子(RSD,46%),或表示为每体积碳含量为0.38 pg C / mum(3)(RSD,30%)。这些值可与细菌和浮游动物的某些代表的转化因子相媲美。由于怀疑生物聚合物会干扰通过热法测定元素碳的可能性,因此使用Cachier等人(1)的“两步燃烧”方法确定了可能误认为烟灰碳的“真菌碳”的量,并称其为作为“表观元素碳”(AEC)。该馏分总计达初始真菌碳含量的46%。尽管在寒冷的条件下于3月收集了气溶胶样品,但在“粗模式”尺寸分数下,真菌孢子的有机碳占有机碳的2.9-5.4%。 [参考:34]

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