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在硫酸介质中,钛与水杨基荧光酮及CTMAB可以形成两种颜色不同的络合物。当水杨基荧光酮过量时,络合物呈红紫色(λmax=540nm);当钛过量时,络合物呈蓝紫色(λmax=610nm)。本文系统研究了红紫色络合物的生成条件及其在测定钛中的应用。试验证明,钛-水杨基荧光酮-CTMAB的红紫色络合物具有较高的灵敏度ε640=1.64*10~5. 常见阳离子中除钨(Ⅵ)以外,绝大部分阳离子均不干扰钛的测定或可用适当掩蔽剂消除干扰。有色溶液在钛含量为0—5生克/25毫升时,遵守比尔定律。本法可以不经任何分离,直接快速测定某些合金钢及纯金属材料(如铝)中的微量钛并得到了比较满意的结果。
In sulfuric acid medium, titanium and salicylfluorone and CTMAB can form two different color complexes. When salicylfluorone is in excess, the complex is magenta (λmax = 540 nm); when titanium is present in excess, the complex is blue-violet (λmax = 610 nm). This article systematically studied the formation conditions of magenta complex and its application in the determination of titanium. Experiments show that titanium-salicylfluorone-CTMAB magenta complex with high sensitivity ε640 = 1.64 * 10 ~ 5. Common to the cation except for tungsten (Ⅵ), the vast majority of cations do not interfere with the titanium The interference may be measured or eliminated with a suitable masking agent. The colored solution obeys Bill’s law when the titanium content is 0-5 g / 25 ml. This method can be without any separation, direct and rapid determination of some of the alloy steel and pure metal materials (such as aluminum) trace titanium and get more satisfactory results.