Ecole des Métiers de l'Environnement, Campus de Ker Lann, Bruz, France.
Chemosphere. 2012 Oct;89(7):805-9. doi: 10.1016/j.chemosphere.2012.04.058. Epub 2012 May 26.
Some plants are known as indoor air purifiers. A large number of studies report kinetic purification results for an extensive panel of plants, i.e. the pollutant concentration (volatile organic compounds, as known as VOC, most of the time) is continuously monitored by gas chromatography. However, only a few papers describe the mechanisms involved in such processes. This study deals with the use of secondary ion mass spectrometry imaging as an efficient tool to locate atmospheric pollutant as bromotoluene within the Hedera helix plant (leaf, roots) and the substrate on which it was previously grown. Hedera helix plants have been placed in a pollution chamber with control of the exposure parameters. Plant and soil samples excised were transferred into a fixative solution of glutaraldehyde and paraformaldehyde for a few days, were dehydrated using ethanol and were embedded with resin. Cross sections were made from the pale brown solids obtained. Then, a device using a cathodic pulverization device capable of depositing a few nanometers of gold atoms over the sample was used to make the surface electronically conductive for the NanoSIMS. Hence, polluted and unpolluted samples of Hedera helix and substrates were obtained following a careful procedure that allowed for the discrimination between polluted and nonpolluted ones. Nanoscale spatial resolution was an invaluable tool (NanoSIMS) to achieve this, and proved that VOCs, such as bromotoluene, were actually trapped by plants such as Hedera helix.
有些植物被称为室内空气净化器。大量研究报告了广泛的植物动力学净化结果，即通过气相色谱法连续监测污染物浓度（挥发性有机化合物，通常称为 VOC）。然而，只有少数几篇论文描述了涉及这些过程的机制。本研究使用二次离子质谱成像作为一种有效的工具，来定位大气污染物溴甲苯在常春藤（叶片、根系）和其先前生长的基质中的位置。常春藤植物被放置在一个带有暴露参数控制的污染室中。将切除的植物和土壤样本转移到戊二醛和多聚甲醛的固定溶液中几天，然后使用乙醇进行脱水，并嵌入树脂中。从获得的淡棕色固体中制作横截面。然后，使用能够在样品上沉积几纳米金原子的阴极粉碎装置，使表面对 NanoSIMS 具有导电性。因此，通过仔细的程序获得了受污染和未受污染的常春藤和基质样本，该程序允许区分受污染和未受污染的样本。纳米级空间分辨率是实现这一目标的宝贵工具（NanoSIMS），并证明了挥发性有机化合物，如溴甲苯，实际上被常春藤等植物所捕获。
