Study On The Effects Of Surfactants On Color Reaction And The Determination Of Aluminum In Titanate Barium

The titanates are fine chemical products with high-value-added and broad prospects, which possess advantages of wide raw material sources, simple synthesis method, low cost and easily doping. With the development of the electronics industry, particularly the production requirements of sensitive components and the establishment of quality management system, it needs higher quality control of electronic components' raw materials. The impurity content index of the titanates raw material develops increasingly in the direction of trace amount even ultra trace amount. Therefore, the establishment of a simple and reliable analysis method has become the focus of research.At present, trace aluminum is determinated mainly by the method of spectrophotometry with Chrome Azurol S. However, due to the substrate disturbance, the sensitivity of the method is dramatically reduced. Therefore, the measured value is not reliable, when the content of aluminum in functional powder was determined. Micellar Solubilization spectrophotometry can solve the problem of low sensitivity and poor selectivity.In this paper, firstly, we studied the effects of different types of surfactants on color reaction through single factor experiment. In accordance with the results of single factor experiment, we designed simplex optimization experiments, and obtained the best determination conditions of quaternary color system. The method has high sensitivity, and the content of Al in the range of 0 to 0.2mg/L follows a good linear relationship.The mechanism of effects of various types of surfactants on color system has been explored. According to the determination results of Zetasizer interface potential instrument, we have come to the mechanism of stability augmentation of non-ionic surfactants on color reaction. Because of its addition, the entire system showed electrical neutrality, thus stabilizing the color system. The analytical and mathematical results of Laser light scattering of particle size analyzer verified that the molar absorptivity is proportional to the effective proton-color cross-sectional area. The determination results of several instruments showed that the effects of cationic surfactant on color system are not the same with its concentration before and after the critical micelle concentration. We have found that, there are two forces existing between cationic surfactant and Al-CAS complex anion. The combination of these two forces impact on color system, so that the maximum absorption wavelength and molar absorptivity increase dramatically.We also have investigated the relationship between cationic surfactant structure and sensitization, and have summarized the relevant law. The effect of enhanced sensitivity of cationic surfactant with straight-chain is better than branched-chain; the effect of enhanced sensitivity of cationic surfactant with long-chain is better than short-chain; the effect of enhanced sensitivity of different hydrophilic groups is followed by the order from strong to weak: pyridyl> benzyl ammonium> trimethylammonium.The influences of masking agents on eliminating or reducing the substrate disturbance were studied. Finally, determination result indicated, the mandelic acid has the best obvious effect on eliminating substrate disturbance. The sensitization of surfactants and the shelter of mandelic acid were used together in the determination of aluminum in barium titanate samples. Linear range was from 0 to 0.32 mg/L, the detection limit was 0.014 mg/L and the recovery rate was from 94.4 % to 103.4 %.