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首页> 外文期刊>Atmospheric chemistry and physics >Insights into dissolved organic matter complexity in rainwater from continental and coastal storms by ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry
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Insights into dissolved organic matter complexity in rainwater from continental and coastal storms by ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry

机译：超高分辨率傅里叶变换离子回旋共振质谱法对大陆和沿海风暴雨水中溶解有机物复杂性的认识

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摘要

A series of seven rainwater samples were collected in Wilmington, North Carolina USA originating from both continental and coastal storms and analyzed by ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). This data set is unique in that it represents a detailed comparison of the molecular level composition of DOM in rainwater collected from distinctly different air mass back trajectories by FT-ICR MS. Approximately 25% of the roughly 2000 assigned CHO molecular formulas are unique to a single storm classification indicating the importance of air mass back trajectory on the composition of rainwater dissolved organic matter (DOM). Analysis of the unique molecular formula assignments highlighted distinct groupings of various bio- and geo-molecule classes with coastal storms containing unique formulas representative of lignin and cellulose-like formulas while continental storms had lipid-like formulas. A series of 18 distinct methylene oligomers were identified in coastal storms and 13 unique methylene oligomers in continental storms, suggesting oligomer formation is ubiquitous in rainwater albeit different for each storm classification. Oligomers of small acids and C_3H_4O_2 were detected in both storm types indicating their processing may be similar in both back trajectories. Condensed aromatic hydrocarbons were detected in continental storms with phenol moieties that are not as oxidized as similar compounds detected in aquatic DOM.
机译：在美国北卡罗来纳州的威尔明顿收集了一系列来自大陆和沿海风暴的七个雨水样品，并通过超高分辨率傅里叶变换离子回旋共振质谱（FT-ICR MS）进行了分析。该数据集是独特的，因为它代表了通过FT-ICR MS从截然不同的空气质量反演轨迹收集的雨水中DOM分子水平组成的详细比较。在大约2000个分配的CHO分子式中，大约25％是单个风暴分类所独有的，这表明空气质量反轨迹对雨水溶解有机物（DOM）的组成非常重要。对独特分子式分配的分析突出显示了各种生物和地分子类别的不同类别，沿海风暴包含代表木质素和纤维素样分子式的独特分子式，而大陆风暴具有类脂分子式。在沿海风暴中鉴定出一系列18种不同的亚甲基低聚物，在大陆性风暴中鉴定出13种独特的亚甲基低聚物，这表明低聚物在雨水中无处不在，尽管每种风暴的分类都不同。在两种风暴类型中均检测到小酸和C_3H_4O_2的低聚物，这表明它们的处理在两个后向轨迹中都相似。在大陆风暴中发现了苯酚部分缩合的芳烃，其氧化程度不及水生DOM中检测到的类似化合物。

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