基于光谱学方法研究腐殖质氧化还原活性

项目名称： 基于光谱学方法研究腐殖质氧化还原活性

项目编号： No.21307004

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 环境科学、安全科学

项目作者： 姜杰

作者单位： 北京林业大学

项目金额： 25万元

中文摘要： 腐殖质结构复杂，具有氧化还原性，易与污染物发生反应，在土壤中可通过直接氧化还原或作为电子载体等多种途径影响重金属和有机污染的迁移转化，加速或减缓有毒物质的释放。腐殖质的电子载体性质和氧化还原能力取决于氧化还原官能团的性质和多寡。传统的化学方法测定氧化还原能力方法繁杂，无法在污染土壤现场操作，并且无法反应腐殖质氧化还原反应的化学结构方面的信息。本研究创新性的设计了通过光学方法测定腐殖质（及腐殖质解离物质）氧化还原反应前后的光谱变化，结合腐殖质氧化还原能力的化学测定数据，腐殖质还原过程中产生自由基的量，判定其氧化还原官能团的量及在腐殖质分子上的结构分布。研究的目的是建立腐殖质氧化还原能力、氧化还原官能团含量和对污染物迁移影响之间的数量关系。研究对象主要包括各种类型土壤，主要目标土壤为富含强氧化还原活性的污染物的土源。

中文关键词： 腐殖质；电子传递；氧化还原；E4/E6；三维荧光光谱

英文摘要： Humic substances (HS) are redox-active natural organic compounds with extremely complicated chemical structure and serve as electron shuttles between microorganisms and iron(III) minerals. They are capable of influencing the fate of contaminants, especially the redox active species, by accelerating or retarding release from source and transport in the environment.?Depending on quality and quantity of redox functional groups contained by HS, HS' redox abilitites deffer with each other. Quinones are the most important redox functional groups in HS. It is very difficult to be measured or determined. Here, we develop a new strategy to determine redox activity with two methods: First, determination of redox activity by by measuring the amount of electrons transferred and determination of quinines as redox functional groups with a few kind of using spectroscopy methods. Afterwards, two group of results will be linked and shown in the a model --- a HS redox model, which is also one of the main goals of this research.We are going to build a model consisting of redox activity of HS, radical contents of HS and reaction information of HS and iron.Building of the HS-redox-model can strongly contribute to the soil remediation project, both in-site and on-site, especially contenting the redox-active contaminants soil.

英文关键词： humic substances；electron shuttle；redox reaction；E4/E6；3DEEM