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当前,在金属离子的光度分析中,有机显色剂的应用占有重要地位。这是因为有机试剂的分析功能团、配位原子、分子形状和大小等均可以比较自由的控制,较易设计出适合于分析对象的高灵敏度、高选择性的大量试剂。其中应用最广的是与金属离子形成有色螫合物的试剂。近年来另一类有机试剂——离子缔合试剂引起了人们的注意。这种方法常常可使一些无色或浅色的金属给离子,由于与带相反电荷的有色的离子缔合试剂形成离子缔合物而进行光度或萃取-光度测定。这不仅扩大了光度分析的应用范围,而且在某些场合下还可获得非常高的灵敏度和良好的选择性。如果金属络离子本身有色,
Currently, in the photometric analysis of metal ions, the application of organic developers occupy an important position. This is because the organic reagents can be freely controlled with the analysis of functional groups, coordination atoms, molecular shapes and sizes, etc. It is easier to design a large number of reagents of high sensitivity and selectivity suitable for analysis. One of the most widely used is the formation of colored compounds with metal ions reagent. In recent years, another type of organic reagent - ion-association reagent has drawn people’s attention. This method often allows some colorless or light colored metal to be ionized, photometric or extraction-photometric due to formation of an ion association with an oppositely charged colored ion-associating reagent. This not only expands the application of photometric analysis, but also in some cases can obtain very high sensitivity and good selectivity. If the metal complex ion itself is colored,