利用茜素紫与阳离子表面活性剂的胶束增敏分光光度法测定钼与钨已有报导,但上述方法的灵敏度及选择性均不够理想。作者认为,如果于茜素紫分子中导入卤素吸电子基,则有可能使试剂分子的π电子共轭体系得到相应的改善,从而导致反应灵敏度的增加。与此同时,卤素吸电子基对试剂分子羟基的解离作用的增强,最后促使络合反应移向更为酸性的介 Determination of molybdenum and tungsten by micellar spectrophotometry with alizarin violet and cationic surfactants has been reported, but the sensitivity and selectivity of the above methods are not ideal. The author believes that if the introduction of alizarin purple molecule halogen electron-withdrawing group, it is possible to make the reagent molecule π electron conjugated system was improved, resulting in increased sensitivity. At the same time, the electron-withdrawing group of halogen enhances the dissociation of the hydroxyl group of the reagent molecules, finally, the complexation reaction is shifted to the more acidic medium