水环境中的溶解有机质及其与金属离子的相互作用——荧光光谱学研究

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	水环境中的溶解有机质及其与金属离子的相互作用——荧光光谱学研究
其他题名	Dissolved Organic Matter in Natural Aquatic Environments and Its Complexation with Metal Ions: A study Based on Fluorescence Spectroscopy
	傅平青
	2004
学位授予单位	中国科学院地球化学研究所
学位授予地点	中国科学院地球化学研究所
学位名称	博士
学位专业	地球化学
关键词	溶解有机质腐殖酸富里酸三维荧光光谱同步荧光光谱体积排阻色谱荧光猝灭滴定红枫湖百花湖洱海沉积物孔隙水太阳辐射
摘要	本论文通过选择这一国际前沿科学领域,主要运用三维荧光光谱仪、紫外-可见分光光度仪、溶解有机碳/氮分析仪、高效体积排阻色谱、荧光猝灭滴定等分析化学方法和手段,对云贵高原湖泊红枫湖、百花湖、洱海沉积物孔隙水以及一些河流等当中的DOM及其水化学特征进行了深入细致的研究,并且运用三维激发发射荧光光谱研究DOM中不同组分与Hg的相互作用,在溶解有机质的化学结构及其与金属汞的相互作用机理等方面取得了一些进展.
其他摘要	Dissolved organic matter (DOM), which is ubiquitous in almost all of the natural waters (e.g. sea and ocean, river, lake, bog water and ground water), was widely studied because of its significant role in shaping the aquatic environments since last decade. DOM influences a wide variety of physical, chemical and biological processes. Light absorption by DOM has a strong influence on the penetration of ultraviolet and photosynchetically active radiation. DOM mainly comprises organic acids and, therefore, affects pH of the waters and in some acidic waters acts as a buffer. The interactions between DOM and metal ions, organic pollutants influence their concentrations, transportation, toxicity and bioavailability. DOM acts as a large organic carbon reservoir exchanging with the atmosphere, where carbon (as CO2) plays as important role in climate regulation. All of these provide very good reasons for acquiring a better understanding of the origin, composition and structure features of DOM and the role it plays in geochemical processes. In this paper, analytical methods such as three-dimensional excitation emission matrix fluorescence spectroscopy (3DEEM), UV-Vis absorbance, and high performance size exclusion chromatography were selected to investigate the physical and chemical properties and seasonal variations of DOM in lake waters (Lake Hongfeng, Lake Baihua), lake sediment porewaters and DOM in Nanming River watershed. The complexation between DOM and metal ions were also investigated by using 3DEEM and fluorescence quenching titration.
页数	161
语种	中文
文献类型	学位论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/3702
专题	研究生_研究生_学位论文环境地球化学国家重点实验室
推荐引用方式 GB/T 7714	傅平青. 水环境中的溶解有机质及其与金属离子的相互作用——荧光光谱学研究[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,2004.

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