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光度分析方法灵敏度的提高和应用范围的扩大,是与新显色试剂的采用和一些新显色体系的开辟分不开的。近20多年来,有机显色试剂和光度分析方法的发展非常迅速。这方面所发表的文献数量历年来一直在整个化学分析文献中占有相当大的比重(25～40％)。显色剂的品种也增长得很快,有人曾统计过1957年至1967年的情况,发现显色剂已由原来的1400多个增至4900多个。进入七十年代以后,新试剂的增长虽有所减缓,但涌现出来的新品种的总数仍是可观的。有一些新型的试剂,如冠醚化合
The sensitivity of photometric methods and the expansion of the scope of application are inseparable from the adoption of new chromogenic reagents and the development of some new chromogenic systems. For more than 20 years, the development of organic chromogenic reagents and photometric methods has been very rapid. The number of articles published in this area has accounted for a significant proportion (25-40%) of the total chemical analysis literature over the years. The color of the developer has also increased rapidly. Someone once made statistics on the situation from 1957 to 1967 and found that the number of developers has increased from over 1,400 to more than 4,900. After entering the seventies, although the growth of new reagents has slowed down, the total number of new breeds that have emerged is still considerable. There are some new types of reagents, such as crown ether