论文部分内容阅读
在表面活性剂存在下,钛和三羟基萤光酮类试剂能形成灵敏度很高的络合物。本文对4,5—二溴苯基萤光酮—钛(Ⅳ)十六烷基三甲基溴化铵(CTMAB)三元络合物体系做了系统的研究,结果表明:该三元络合物最大吸收在570nm波长处,表观摩尔吸光系数为1.09×10~5,二氧化钛0～12微克/25毫升,符合比尔定律。有色溶液可稳定2小时。形成三元络合物的最佳条件是:酸度pH1～1.2N硫酸,动物胶用量1～2毫升(1％),CTMAB1～4毫升(0.5％),4,5—二溴苯基萤光酮4～6毫升(0.5％乙醇溶液),乙醇5～8毫升。采用氢氧化钾熔矿可除去大部分干扰元素。锆的干扰用草酸掩蔽,大量铁(Ⅲ)的影响用抗坏血酸消除。本法灵敏度高,选择性好,用于岩石和矿物中0.001～0.1％钛的测定。
In the presence of surfactants, titanium and trihydroxyfluorone reagents can form highly sensitive complexes. In this paper, we systematically studied the system of ternary complex of 4, 5-dibromophenylfluorone-titanium (CTMAB) with CTMAB. The results show that the ternary complex The maximum absorption of the compound at 570nm wavelength, the apparent molar absorptivity of 1.09 × 10 ~ 5, titanium dioxide 0 ~ 12 micrograms / 25 ml, in line with Beer’s law. The colored solution is stable for 2 hours. The optimum conditions for the formation of the ternary complex are as follows: acid pH 1 ~ 1.2N sulfuric acid, 1 ~ 2 ml (1%) of animal glue, 1 ~ 4 ml CTMAB (0.5% Ketone 4 ~ 6 ml (0.5% ethanol solution), ethanol 5-8 ml. The use of potassium hydroxide ore can remove most of the interference elements. Interferences with zirconium are masked with oxalic acid and the effect of a large amount of iron (III) is eliminated with ascorbic acid. This method has high sensitivity and good selectivity and is used for the determination of 0.001-0.1% titanium in rocks and minerals.