Study on visual measurement of environmental pollutants using a thixotropy gel

本文提出了一种新的触变性凝胶目视测量金属离子的方法。当对凝胶施加振动时，功能凝胶从固体（凝胶）变为液体（溶胶）。静置一段时间后，液体又变成固体（凝胶）。该凝胶在液-液萃取中具有较高的萃取效率，且萃取前后相分离简单。在本研究中，开发了如下3种类型的视觉测量。(1)使用触变性凝胶对水样中的Fe（II）离子进行简单快速的目视测量。(2)使用触变性凝胶对水样中Cu（I，II）离子进行简单快速的目视测量。(3)用触变性凝胶两步萃取法目视测定Cu（I，II）离子，用红菲咯啉作螯合剂的触变性凝胶对Fe（II，III）离子的萃取随浓度的增加由无色变为红色，用浴铜灵作螯合剂的触变性凝胶对Cu（I，II）离子的萃取随浓度的增加由无色变为橙子。此外，对于使用触变性凝胶的第二次提取，发现如果凝胶是无色的，则Cu浓度低于水标准。然后，如果凝胶着色为红色，则Cu浓度超过水标准，并且从颜色强度评估总Cu浓度。在这项研究中，确定的浓度的基础上的颜色的凝胶通过视觉使用的触变性凝胶简单和快速。

A new visual measurement of metallic ions using a thixotropy gel was developed. The functional gel changed from solid (gel) to liquid (sol) when vibration was given to the gel. And after stand for a while, the liquid became solid (gel) again. The gel have a high extraction efficiency on liquid-liquid extraction, and have a simple phase separation on before and after extraction. In this study, 3 types of visual measurements were developed as follows.(1) Simple and rapid visual measurement of Fe(II) ion in water samples using a thixotropy gel.(2) Simple and rapid visual measurement of Cu(I, II) ions in water samples using a thixotropy gel.(3) Visual measurement of Cu(I, II) ions by 2 step extractions using thixotropy gels.The gel changed from colorless to red with increase of the concentration for Fe(II, III) ions by a thixotropy gel containing a bathophenanthroline as a chelate agent, and that changed from colorless to orange for Cu(I, II) ions by a thixotropy gel containing a bathocuproine. Furthermore, for the second extraction using a thixotropy gel, it was found that the Cu concentration was low than the water standard if the gel was colorless. And then, if the gel colored to red, the Cu concentration was over the water standard, and the total Cu concentration was evaluated from the color intensity. In this study, the concentrations of determined based on the color of the gel by visual using a thixotropy gel simply and rapidly.