许多高纯试剂、特别是药剂常需严格控制其中钡的含量。如,使用含有痕量钡的氯化钾注射液作静脉注射,可迅速使人致命。因此,寻找一种简便、快速、灵敏的测定痕量钡的方法是十分必要的。用光谱法、原子吸收法等测定痕量钡虽然灵敏、快速,但稳定性、重现性较差,并且仪器结构复杂,价格昂贵,不易普及。目前,随着各种变色酸双偶氮类显色剂的合成,不仅为稀土元素的光度分析法开拓了广 Many high purity reagents, especially pharmaceuticals, often require strict control of the barium content. For example, the use of trace potassium containing potassium chloride injection for intravenous injection, can quickly make people deadly. Therefore, to find a simple, rapid and sensitive method for the determination of trace amounts of barium is very necessary. Determination of trace amount of barium by spectrometry and atomic absorption spectrometry is sensitive and rapid, but its stability and reproducibility are poor. The structure of the instrument is complicated and expensive, which is not easy to popularize. At present, with the synthesis of various chromotropic acid disazo color developers, it not only opens up a wide range of applications for the photometric analysis of rare earth elements