我们曾对磷钼酸、磷钼蓝、磷钼钒等与碱性染料的显色体系作过较多的研究。其他作者也均集中在杂多酸,杂多蓝与碱性染料的显色体系的研究。近年,我们在筛选各种不同取代基的2,3,7—三羟基萤光酮方面做了一些工作,希望能得到钨钼各有选择性的三羟基萤光酮试剂,发现引进磷酸可提高对氨基苯基萤光酮(PAF)—溴 We have done more research on the chromogenic system of phosphomolybdic acid, phosphomolybdic blue, phosphomolybdic vanadium and other basic dyes. Other authors are also focused on the study of the color system of heteropoly acid, heteropoly blue and basic dyes. In recent years, we have done a lot of work in the screening of 2,3,7-trihydroxyfluorone with various substituents. We hope that we can get trihydroxyfluorone reagents with selectivity for both tungsten and molybdenum. We found that the introduction of phosphoric acid can be improved P-aminophenylfluorone (PAF) - Bromine