Enhancement on sensitivities and selectivities of absorption and fluorescence spectrometries with combination of various optical effects and application to the natural water analysis.

结合各种光学效应，增强吸收和荧光光谱的灵敏度和选择性，并应用于天然水分析。

基本信息

批准号：
05453068
负责人：
FUJIWARA Kitao
金额：
$ 4.8万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Various optical effects obtained with lights such as lasers have been used for enhancement in sensitivity and selectivity of absorption and fluorescence spectrometries. First, thermal lensing effect was investigated in the liquid crystal system. It has been discovered, when a dual beam system was employed, the focus of the thermal lens varied according to the orientation of the polarization plane of the probe laser. The thermal lensing signal is twice or larger than that in the isotropic media. Second, when polarized laser light was irradiated into the solution in which diluted magnetic fluid was coexistent with dye, fluorescence of the dye changes under magnetic field. It was found that the magnitude of this change depends on the molecular structure of the dye. These phenomena can be explained by orientation of the dye molecules to the magnetic fluid particles under magnetic field. These results show the oriented media are effective to improve the sensitivity and selectivity of absorption and fluorescence spectrometries. As the application of the optical effects, the photochemical characterization of dissolved organic matter in natural waters was carried out as to the multi-photon ionization. Dissolved organic matter was irradiated by 355 nm output of YAG laser for producing hydrated electrons. Life-time and quenchers of the generated hydrated electron are much different between seawater and land water. Photo-reduction of nitrate to nitrite and chemiluminescence of silane were also investigated for analyzes of nitrate and silicate in seawater.

用诸如激光等灯获得的各种光学效应已用于增强吸收和荧光光谱的敏感性和选择性。首先，在液晶系统中研究了热透镜效应。已经发现，当使用双光束系统时，热透镜的焦点会根据探针激光的极化平面的方向而变化。热透镜信号是各向同性介质中的两倍或大。其次，当将极化激光照射到溶液中时，稀释的磁液与染料共存时，染料在磁场下变化的荧光。发现这种变化的大小取决于染料的分子结构。这些现象可以通过将染料分子定向到磁场下的磁液颗粒方向来解释。这些结果表明，定向培养基可有效提高吸收和荧光光谱的敏感性和选择性。随着光学效应的应用，对自然水域中溶解有机物的光化学表征进行了多光子电离。 YAG激光器的355 nm输出用于产生水合电子。在海水和陆上水之间，生成的水合电子的终身和淬火者大不相同。还研究了将硝酸盐的光合硝酸盐和硅烷化学发光的光含量，以分析硝酸盐和海水中的硅酸盐。