Materić Dušan, Peacock Mike, Kent Matthew, Cook Sarah, Gauci Vincent, Röckmann Thomas, Holzinger Rupert
Faculty of Science, Institute for Marine and Atmospheric Research, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, Netherlands.
Faculty of STEM, School of Environment Earth and Ecosystems, The Open University, Milton Keynes, MK7 6AA, UK.
Sci Rep. 2017 Nov 21;7(1):15936. doi: 10.1038/s41598-017-16256-x.
Proton Transfer Reaction - Mass Spectrometry (PTR-MS) is a sensitive, soft ionisation method suitable for qualitative and quantitative analysis of volatile and semi-volatile organic vapours. PTR-MS is used for various environmental applications including monitoring of volatile organic compounds (VOCs) emitted from natural and anthropogenic sources, chemical composition measurements of aerosols, etc. Here we apply thermal desorption PTR-MS for the first time to characterise the chemical composition of dissolved organic matter (DOM). We developed a clean, low-pressure evaporation/sublimation system to remove water from samples and coupled it to a custom-made thermal desorption unit to introduce the samples to the PTR-MS. Using this system, we analysed waters from intact and degraded peat swamp forest of Kalimantan, Indonesian Borneo, and an oil palm plantation and natural forest in Sarawak, Malaysian Borneo. We detected more than 200 organic ions from these samples and principal component analysis allowed clear separation of the different sample origins based on the composition of organic compounds. The method is sensitive, reproducible, and provides a new and comparatively cheap tool for a rapid characterisation of water and soil DOM.
质子转移反应质谱法（PTR-MS）是一种灵敏的软电离方法，适用于挥发性和半挥发性有机蒸气的定性和定量分析。PTR-MS用于各种环境应用，包括监测自然和人为来源排放的挥发性有机化合物（VOCs）、气溶胶的化学成分测量等。在此，我们首次应用热脱附PTR-MS来表征溶解有机物（DOM）的化学成分。我们开发了一个清洁的低压蒸发/升华系统以去除样品中的水分，并将其与定制的热脱附单元相连，以便将样品引入PTR-MS。使用该系统，我们分析了印度尼西亚婆罗洲加里曼丹完整和退化泥炭沼泽森林以及马来西亚婆罗洲沙捞越的油棕种植园和天然森林中的水样。我们从这些样品中检测到200多种有机离子，主成分分析能够基于有机化合物的组成清晰区分不同的样品来源。该方法灵敏、可重复，为快速表征水和土壤中的DOM提供了一种新的且相对便宜的工具。
