用冠醚进行碱金属离子的光度法测定是分析工作者感兴趣的课题。这方面的研究目前主要有两类方法。一类方法是合成生色冠醚,应用生色冠醚络合萃取水相中的碱金属离子进行光度法测定。自Takagi合成4’-苦胺基-B15C5作为测定钾的显色剂以来,人们还合成了一系列苦胺基冠醚衍生物和取代甲氧基冠醚用作测定碱金属离子的显色剂。也有关于这些试剂应用的报道。但这类方法的灵敏度不太 Photometric determination of alkali metal ions with crown ethers is a subject of interest to analysts. At present, there are mainly two kinds of methods in this aspect. A class of methods is the synthesis of color-forming crown ether, the application of chromotropic ether complex extraction of alkali metal ions in the aqueous phase spectrophotometric determination. Since the synthesis of 4’-Kuramino-B15C5 from Takagi as a reagent for the determination of potassium, a series of acylamidocetin derivatives and substituted methoxy crown ethers have also been synthesized as color-developing agents for the determination of alkali metal ions . There are also reports on the use of these reagents. However, this method is not very sensitive