【摘要】 <正> 关于苯基萤光酮及其它三羟基萤光酮类试剂在分析化学中的应用已有专著和评述。若在呫吨环中接近有成络活性的邻二羟基及邻羟羰基的位置上引入溴原子,则因溴原子的电负性较强而使共轭体系中的π电子更易流动,从而试剂分子的激发能降低,对高价金属离子将具有更高的灵敏度,吸收峰红移,成络反应移向较强的酸性范围。故溴化后的2,3,7-三羟基萤光酮及3,4,5-三羟基呫吨类化合物比原试剂具有更好的分析性能。这点已由量子化更多还原

【Abstract】 A highly sensitive color reagent 4,5-dibromophenylfluorone (Br-PF) has been synthesized and identified. The color reactions of Br-PF with some metal ions, such as niobium (V), zirconium(IV), hafnium (IV), molybdenum (VI), tungsten(VI), titanium (IV), vanadium (IV), chromium(III), gallium (III), indium(III), uranium(VI); antimony(III), bismuth (III), scandium(III), yttrium(III) and aluminum(III), have been investigated and optimum conditions have been obtained. The apparent molar absorptivities of the complexes are(1.0～3.3) x 10~5 at maximum absorption wavelengths. The molar ratio of the complexes have been estimated. These methods have been used for the analysis of Nb, Zr, Mo, W, Ti, Ga, In and U in steels and ores with satisfactory results.更多还原