合金中微量元素的光度测定,由于最近20年来新合成的有机显色试剂不断发现,因此为合金的光度分析创造了极为有利的条件。例如在1950年铌和钽的比色试剂仅有几种,但到了1966年已发展到112种,其中不少具有较高的灵敏度和选择性。表1共列举了73种光度测定法,其它光度法将作如下的介绍。 The photometric determination of trace elements in the alloy has found extremely favorable conditions for the photometric analysis of the alloy due to the constant discovery of newly synthesized organic chromogenic reagents in the past 20 years. For example, there were only a few colorimetric reagents for niobium and tantalum in the 1950s, but by 1966 it had grown to 112 species, many of which were highly sensitive and selective. Table 1 lists a total of 73 kinds of photometry, other photometric method will be introduced as follows.