金属錯体システムの色彩特性を利用する超微貴金属イオンの目視簡易分析法の開発

概要

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The importance of simple analytical methods that require no sophisticated instruments is increasing. For simple measurements, visual methods based on the perception of color change and the recognition of figure are more suitable. The author has developed simple methods for the visual determination of trace metal ions, based on construction of the following chemical systemS. First, for the visual sensitive detection of trace aluminium, a simple concentration method was developed. After a drop of solution are evaporated on a hydrophobic substrate, components, such as several pH buffers or poly(vinyl alcohol), form a ring-like solid phase. Aluminium ion was concentrated into the ring as a fluorescent chelate of 2,2'-dihydroxyazobenzene and distinctly detected. This method has been successively applied to the determination of ppb levels of aluminium in tealeaves. Second, a color-forming reaction system has been developed, which makes it possible to visualize the concentration of metal ions by using a color property of the Xylenol Orange (XO)-metal complex system. The Xylenol Orange-Fe (III) system gives yellow, red, and purple blue along with an increase in the iron concentration, owing to a sequential formation of Fe^<III>(xo) and Fe^<III>_2(xo). A field test for iron leached from rock samples was developed by using the color reaction, and was applied to the prediction of water quality in aquifers.
2000-01-05