Atmospheric Pollution Laboratory (LCA), Department of Applied Physics, Miguel Hernández University, Avenida de la Universidad S/N, 03202, Elche, Spain.
Environ Sci Pollut Res Int. 2024 Apr;31(17):25216-25226. doi: 10.1007/s11356-024-32789-x. Epub 2024 Mar 11.
The concentrations of anhydrosugars (levoglucosan, mannosan, and galactosan), polyols (inositol, xylitol, sorbitol, and mannitol), and glucose were measured in PM and PM samples collected during 1 year at a traffic site in the city of Elche (southeastern Spain). Levoglucosan, mannosan, and galactosan were mainly found in the PM fraction since they are mainly emitted from biomass burning (BB). Likewise, inositol, xylitol, and sorbitol were primarily distributed in the fine mode, suggesting a non-negligible contribution from anthropogenic sources (specifically BB) to the levels of these compounds. This was supported by their seasonal variations, with higher concentrations during winter, and their correlations with levoglucosan concentrations. The average contributions of biomass burning and biogenic sources to OC and PM levels were calculated using levoglucosan and mannitol, respectively, as tracers. On average, BB accounted for 12% and 16% of the OC in PM and PM, while the estimated contribution of fungal spores to OC and PM levels was 1.2 and 0.8%, respectively. The results of the present study suggest that, at least in the study area, most sugar alcohols are not appropriate tracers of biogenic emissions.
在西班牙东南部城市埃尔切的一个交通站点，采集了一年的 PM 和 PM 样本，对其中的无水糖（左旋葡聚糖、甘露聚糖和半乳糖）、多元醇（肌醇、木糖醇、山梨糖醇和甘露醇）和葡萄糖浓度进行了测量。由于主要来自生物质燃烧（BB），左旋葡聚糖、甘露聚糖和半乳糖主要存在于 PM 部分。同样，肌醇、木糖醇和山梨糖醇主要分布在细颗粒模态中，表明这些化合物的水平有不可忽视的人为来源（特别是 BB）贡献。这一点得到了它们季节性变化的支持，冬季浓度较高，与左旋葡聚糖浓度呈相关性。利用左旋葡聚糖和甘露醇分别作为示踪剂，计算了生物质燃烧和生物源对 OC 和 PM 水平的平均贡献。平均而言，BB 占 PM 和 PM 中 OC 的 12%和 16%，而真菌孢子对 OC 和 PM 水平的估计贡献分别为 1.2%和 0.8%。本研究结果表明，至少在研究区域内，大多数糖醇不是生物源排放的合适示踪剂。
