- 作者: 李基壽; 張富昌; 葉有財
- 作者服務機構: Analytical Chemistry Certer, Institute of Nuclear Energy Research, P. O. Box 3-19, Lung-Tan, Taiwan 325
- 中文摘要: A sensitive spectrophotometric method was developed for the determination of zirconium in monazite sand. The zirconium ion was previously separated from the other interfering elements by a 0.5M thenoyltrifluoroacetone (TTA)-xylene extraction, then determined with Arsenazo III in 9M HCl medium. Zirconium reacted with Arsenazo III to form an emeraled green coloured complex having maximum absorbance at 665nm in 9M HCl medium. The color was stable for at least 2hours. Effects of time, HCl concentration, gelatine and various ions have been studied. The system confirms the Beer’s law over the concentration range investigated. Optimum condition range for measurement in 1.0cm quartz cell is 0.1-0.5μg/ml of zirconium. The molar absorptivity is 1.51×10… liter mole-1 cm-1. The metal-ligand ratio of 1:4 was confirmed by Job’s Continuous Variation metgod and the conditional stability constant of Zirconium-Arsenazo III Complex in 4 M HCl and 9M HCl were also determined by this method.
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