Methoxyphenols and levoglucosan ratios in PM2.5 from wheat and Kentucky bluegrass stubble burning in eastern Washington and northern Idaho
Methoxyphenols and levoglucosan ratios in PM2.5 from wheat and Kentucky bluegrass stubble burning in eastern Washington and northern Idaho
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DOI：
10.1021/es062039v
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发表时间：
2007-11-15
影响因子：
11.4
通讯作者：
Simpson, Christopher D.
中科院分区：
文献类型：
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作者：
Jimenez, Jorge R.;Claiborn, Candis S.;Simpson, Christopher D.
华盛顿东部受到各种污染源的影响，其中农业燃烧是一个特殊的负担。野外燃烧产生的烟雾对附近社区造成滋扰，也是健康问题。本研究评估左旋葡萄糖（LIG）和甲氧基苯酚（MP）作为潜在的示踪剂分配现场燃烧烟雾。从小麦和肯塔基州早熟禾（KBG）的根茬烟雾中收集了室内和田间燃烧的PM2.5（空气动力学直径< 2.5 μ m的颗粒物）样品。分析了样品的无机和有机示踪剂，包括LG和19 MP。对于室内实验，LIG的量，类似于23 μ g mg（-1）PM2.5，发现在小麦和KBG残茬烟雾是相似的，而总的MP是在小麦中更高。在现场的烟雾样品中发现了与土壤有关的微量元素。丁香醛，乙酰丁香酮，松柏醛被认为是最突出的颗粒相MP在小麦烟雾中，这些化合物并不总是存在于可检测的量在KBG烟雾。在小麦中发现的LG/乙醛的比率（78 +/- 27）高于软木（22 +/- 3）和硬木（类似于5）中报道的相同比率。同样，LG/松柏醛的比率在麦茬烟雾中（180 +/- 39）高于软木（类似于7）和硬木（类似于8）。
Eastern Washington is compromised by various pollution sources, of which agricultural burning is a particular burden. Smoke from field burning is a nuisance to nearby communities and is a concern for health. This study evaluates levoglucosan (LIG) and methoxyphenols (MPs) as potential tracers for apportioning field burning smoke. PM2.5 (particulate matter < 2.5 mu m in aerodynamic diameter) samples from wheat and Kentucky bluegrass (KBG) stubble smoke were collected from chamber and field burns. The samples were analyzed for inorganic and organic tracers, including LG and 19 MPs. For the chamber experiments, the amount of LIG, similar to 23 mu g mg(-1) PM2.5, found in wheat and KBG stubble smoke was similar, while the total MPs was higher in wheat. Trace elements associated with soil were found in smoke samples in the field. Syringaldehyde, acetosyringone, and coniferylaldehyde were found to be the most prominent particle-phase MPs in wheat smoke, and these compounds were not always present in detectable amounts in KBG smoke. The ratio of LG/syringaldehyde found in wheat (78 +/- 27) was higher than the same ratio reported for softwoods (22 +/- 3) and hardwoods (similar to 5). Similarly, the ratio of LG/coniferylaldehyde was higher in wheat stubble smoke (180 +/- 39) compared to that in softwoods (similar to 7) and hardwoods (similar to 8).