UV-VIS spectrophotometry method for the determination of titanium and aluminum in zirconyl chloride

Analysis of Ti and Al in zirconyl chloride (ZrOCI₂.8 H₂0) with a spectrophotometric method has been studied. Analysis of Ti based on the formation of a yellow complex from the reaction of Ti (IV) with H₂O₂ in sulfuric acid solution. Studied the influence of zirconium, the determination of detection limits, precision and accuracy test. Spectrophotometric analysis of Ti obtained optimum conditions: wavelength (A) 400 nm, while the stability of complexes is 5-15 minutes, the concentration of complexing H₂O₂ is 0.3%, sulfuric acid concentrations is 1.0 M, the detection limit is 0.103 µg/mL. Standard curve was linear in the range of concentrations from 1.0 to 30.0 µ/mL with r = 0.999. Zirconium with 20 times concentration of Ti is interference. Content of Ti in ZrOCl₂. 8 H₂O obtained average 0.0048 ± 0.0002%. Testing precision of Ti with coefficient variation is 4.8% and accuracy is 91.4%. Analysis of AI obtained optimum conditions are : λ 536 nm, stable complexes is 7-10 minutes, the concentration of eriokrom cyanine is 3,73.10-5 M, ascorbic acid 0.02%. Standard curve AI with the range concentrations of 10-50 ng/mL is linear with r = 0.999. Zirconium with a concentration of 10 time is not interference. Samples solution in 0.5 M H₂SO₄, extracted with 30% trioctylamine-kerosene, water phase was analyzed. Contents of AI in ZrOCI₂. 8 H₂0 local products obtained average 0.0030 ± 0.0001%. The precision is 2.48% and accuracy is 89.3%. (author)