液相31P核磁共振技术是目前分析沉积物中有机磷化合物较为科学有效的手段，但国际上并没有统一的分析方法，并且现有的方法存在提取效率低、顺磁性离子干扰检测等问题。淡水生态系统沉积物复杂的理化性质，成为影响液相31P核磁共振分析提取效率和图谱质量的重要因素。针对当前沉积物有机磷分析中影响分析效率的主要因素，包括有机质、pH和顺磁性离子，同时也为了优化构建一套较为普适的沉积物中有机磷液相31P核磁共振分析方法，本项目以我国不同类型淡水生态系统沉积物为研究对象，基于液相31P核磁共振技术，探讨不同类型沉积物中有机质、pH和顺磁性离子（Fe、Mn）对核磁共振分析效率的影响机理，对已构建的液相31P核磁共振分析方法进行优化，构建较为普适的沉积物性质导向型的有机磷液相31P核磁共振分析方法，为深入认识沉积物中磷的生物地球化学循环过程和影响因素奠定基础。

The solution 31P nuclear magnetic resonance (NMR) technique is nowadays a relatively scientific and efficient method for analyzing the organic phosphorus (Po) compounds in sediment. However, there is no uniform standard for the analysis methods and there are problems of low extraction efficiency and detection interferences from paramagnetic ions in the existing methods. The complicated physical and chemical natures of the sediment in the freshwater ecosystems make important factors of influencing the extraction efficiency and the picture quality of the solution 31P-NMR. On account of the main factors of influencing the analysis efficiency of organic phosphorus in sediment, including organic matter, pH and paramagnetic ions, and aiming to optimize and construct a set of relatively universal methodology of the solution 31P-NMR to analyze the sediment Po, sediments from different types of freshwater ecosystems are researched based on the solution 31P-NMR technique in this program, in order to give insight into the mechanisms of how organic matter, pH and paramagnetic ions (Fe and Mn) in different kinds of sediments influence the analysis efficiency of the nuclear magnetic resonance, to optimize the constructed solution 31P-NMR analysis method, to establish a relatively universal sediment-oriented methodology of the solution 31P-NMR analysis and to lay a foundation for the further knowledge on the phosphorus biogeochemical cycle in sediment and its influencing factors.