Application Of Bipolar Polydentate Complex Fluorescence Probe Method In Analysis Of Thorium And Uranium

As a potential resource for the sustainable development of nuclear energy in our country,it provides opportunities and broad research space for the development of nuclear power to find a new kind of economically reasonable fuel.In addition to its excellent use in nuclear energy,it has also been widely used in other fields such as optics,radio,aerospace,metallurgy,chemical industry and materials.However,the radioactivity and toxicity of uranium and thorium are very harmful to human health and the environment.Therefore,how to quickly and sensitively detect thorium ions has important significance for environmental science and life science.Uranium is a rare lanthanide transition metal and uranium-235 is a very important fuel for nuclear power generation.However,uranium and its compounds are radioactive and toxic and pose a threat to the environment and people's health.To obtain uranium resources efficiently and prevent uranium pollution,a fast,sensitive and selective method for the detection of uranium must be established.Therefore,it is of great significance to carry out quality monitoring on the heavy metal thorium and uranium content in the environment.In this paper,a bipolar bidentate ligand?Isophthalaldehyde-tetrapyrrole,IPTP?and di-tetradentate macrocyclic ligands?H₄L?were synthesized and their structure and spectral properties were investigated.Using this ligand as a probe,resonance light scattering analysis of enthalpy based on IPTP ligand were proposed.The method and the determination of uranium by Eu3+-H₄L-UO22+ resonance fluorescence method provide a new method for the analysis and detection of uranium and plutonium.The first chapter introduces the characteristics of fluorescent probes,uranium and thorium detection methods and their current research progress.We introduced the properties and applications of IPTP,H₄ L and its metal complexes,the progress of research on metal polymers and the application of resonance light scattering and secondary scattering,frequency double scattering.In Chapter 2,we synthesized the bipolar bidentate ligand IPTP and characterized its structure.The ligand can be self-assembled with cerium ions to form a supramolecular polymer,which makes the resonance light signal and nonlinear resonance signal of the system significantly enhanced.Based on this,we established a method for detecting quinone in solution using this ligand as a probe for RLS,SOS,and FDS.Under the most suitable conditions,the detection limit of thorium?IV?was 0.003?g/ mL.This method has been used for the detection of thorium?IV?in real samples,and the recovery rate is between 98.0% and 101.0%.In Chapter 3,we use a bipolar tetradentate ligand?H₄L?to form a heteronuclear uranyl complex with uranyl and hydrazine ions.Based on the cation-cation interactions?CCIs?,we studied Eu-H₄L-UO22+,and a new method for the determination of uranium in solution by high-sensitivity resonance fluorescence method without separation was established.We also studied the influencing factors and the optimal reaction conditions.The linear range of resonance fluorescence intensity and uranium concentration is 2.5 500 nmol L^-1,and the detection limit is 0.75 nmol L^-1.This method was successfully used for the determination of uranium in samples.