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钛(Ⅳ)比色方法较多,但高灵敏度的却少。文献报导了二溴苯基萤光酮(4,5-二溴2,3,7三羟基-9-苯基-6萤光酮)的酸碱性和光度特性。在羰基和三羟基邻位上引入溴原子,可以改善它的分析性质。溴三羟基萤光酮与三羟基萤光酮相比较,前者与金属离子的显色反应更为灵敏。实验部分主要仪器和试剂: 1.72型分光光度计。 2.HSD-2型酸度计。 3.钛(Ⅳ)标准溶液:称取纯二氧化钛0.1667g于瓷坩埚中,加3—4g焦硫酸钾熔融,稍冷用(5+95)硫酸浸取并移入量瓶中,用(5+95)硫酸稀至1升。使用时再稀释10倍,即10μgTi/ml。
Titanium (Ⅳ) colorimetric method is more, but high sensitivity but less. The literature reports the acid-base and photometric properties of dibromophenylfluorone (4,5-dibromo 2,3,7-trihydroxy-9-phenyl-6-fluorone). Introducing a bromine atom ortho to the carbonyl and trihydroxy groups can improve its analytical properties. Compared with trihydroxyfluorone, Bromo-trihydroxyfluorone is more sensitive to the color reaction of metal ions. Experimental part of the main instruments and reagents: 1.72 spectrophotometer. 2. HSD-2 type acid meter. 3. Titanium (Ⅳ) standard solution: Weigh 0.1667g of pure titanium dioxide in a porcelain crucible, add 3-4g of potassium pyrosulfate melt, slightly cold (5 + 95) sulfuric acid leaching and into the volumetric flask, with (5+ 95) sulfuric acid diluted to 1 liter. Use another 10-fold dilution, ie 10 μgTi / ml.