Understanding Dissolved Organic Matter Reactivity and Composition in Lakes and Streams Using Proton-Transfer-Reaction Mass Spectrometry (PTR-MS),Environmental Science & Technology Letters

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Understanding Dissolved Organic Matter Reactivity and Composition in Lakes and Streams Using Proton-Transfer-Reaction Mass Spectrometry (PTR-MS)
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-11-07 , DOI: 10.1021/acs.estlett.8b00529
Mike Peacock ₁ , Dušan Materić ₂ , Dolly N. Kothawala ₃ , Rupert Holzinger ₂ , Martyn N. Futter ₁

Affiliation

Here, we present a novel approach for investigating dissolved organic matter (DOM) composition using thermal desorption proton-transfer-reaction mass spectrometry (PTR-MS), a technique that provides insight into the molecular composition of DOM < m/z 500 (termed “PTR-DOC”). The applicability of PTR-MS for understanding the relationship between DOM composition and reactivity has yet to be explored. We present results from a synoptic sampling campaign of streams and lakes in a Swedish forest catchment where we measured DOM composition using PTR-MS and traditional optical methods and conducted DOM biodegradability assays. PTR-DOC comprised ≤12% of the total DOC pool. We found significant relationships between PTR-DOC and DOM degradability; reduced chemodiversity and low concentrations of PTR-DOC were both associated with the total DOM pool being more susceptible to microbial degradation. Furthermore, molecular differences were apparent among headwater lakes, headwater streams, and lakes further down the catchment. Direct linkages between PTR-DOC and optical methods were observed. Using the quantitative data that PTR-MS generates, it could become possible to identify the fluorescing components of DOM, and the method may be particularly informative in low-DOC waters such as marine environments where PTR-DOC may dominate the total DOM pool.

中文翻译：

使用质子转移反应质谱（PTR-MS）了解湖泊和河流中溶解的有机物的反应性和组成

在这里，我们提出了一种使用热脱附质子转移反应质谱法（PTR-MS）研究溶解有机物（DOM）组成的新方法，该技术可提供对DOM < m / z的分子组成的洞察力500（称为“ PTR-DOC”）。PTR-MS对于了解DOM组成和反应性之间关系的适用性尚未探索。我们介绍了瑞典森林集水区河流和湖泊的天气概况抽样活动的结果，在该活动中，我们使用PTR-MS和传统的光学方法测量了DOM的成分，并进行了DOM可生物降解性测定。PTR-DOC占总DOC池的≤12％。我们发现PTR-DOC与DOM可降解性之间存在重要关系；化学多样性的降低和PTR-DOC的低浓度都与总DOM库更易受微生物降解有关。此外，在源头湖泊，源头溪流和下游集水区之间的湖泊之间存在明显的分子差异。观察到PTR-DOC和光学方法之间的直接联系。

更新日期：2018-11-08

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