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Fluorescence lifetime evaluation of whole soils from the Amazon rainforest

机译：亚马逊雨林的整个土壤的荧光寿命评估

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Time-resolved fluorescence spectroscopy (TRFS) is a new tool that can be used to investigate processes of interaction between metal ions and organic matter (OM) in soils, providing a specific analysis of the structure and dynamics of macromolecules. To the best of our knowledge, there are no studies in the literature reporting the use of this technique applied to whole/non-fractionated soil samples, making it a potential method for use in future studies. This work describes the use of TRFS to evaluate the fluorescence lifetimes of OM of whole soils from the Amazon region. Analysis was made of pellets of soils from an oxisol-spodosol system, collected in Sao Gabriel da Cachoeira (Amazonas, Brazil). The fluorescence lifetimes in the oxisol -spodosol system were attributed to two different fluorophores. One was related to complexation of an OM fraction with metals, resulting in a shorter fluorophore lifetime. A short fluorescence lifetime (2-12 ns) could be associated with simpler structures of the OM, while a long lifetime (19-66 ns) was associated with more complexOM structures. This new TRFS technique for analysis of the fluorescence lifetime in whole soil samples complies with the principles of green chemistry. (C) 2017 Optical Society of America
机译：时间分辨荧光光谱（TRFS）是一种新工具，可用于研究土壤中金属离子和有机物质（OM）之间的相互作用的方法，提供了大分子结构和动态的具体分析。据我们所知，文献中没有研究报告使用这种技术适用于全/非分馏的土壤样品，使其成为未来研究的潜在方法。这项工作描述了使用TRFS评估来自亚马逊地区的整个土壤的荧光寿命。分析来自来自oxisol-spodosol系统的土壤颗粒，在Sao Gabriel da Cachoeira（亚马逊，巴西）收集。 oxisol -spodosol系统中的荧光寿命归因于两种不同的荧光团。一个与金属的OM级分的络合有关，导致荧光团寿命较短。短荧光寿命（2-12ns）可以与OM的更简单的结构相关联，而长寿（19-66ns）与更复杂的结构相关联。这种新的TRFS技术用于分析整个土壤样品中的荧光寿命符合绿色化学原理。 （c）2017年光学学会

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