Purification of xylenol orange by preparative paper chromatography, and examination of its zirconium complex

Michaylova, V.; Šůcha, L.; Suchánek, Miloslav

doi:10.1016/0039-9140(84)80190-3

Cited by 7 publications

(1 citation statement)

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“…The maximum absorption for these complexes was measured at 650 nm where the reagents do not absorb. On the other hand, xylenol orange reacted in acid medium with Zr ions to form a purple-red water-soluble complex, which has been recommended as a basis for determination of Zr and Hf (Michaylova et al 1984). The most intense color between the Zr ions and the xylenol orange was obtained in 0.5-0.8 M HC1 media, and their absorbance was measured at 535 nm.…”

Section: Heavy Fraction Preparation and Characterizationmentioning

confidence: 99%

Preparation of zirconium oxide nanoparticles from rosette concentrate using two distinct and sequential techniques: hydrothermal and fusion digestion

et al. 2023

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The preparation of zirconium dioxide nanoparticles (ZrO2-NPs) as hard ceramics was accomplished from rosette zircon concentrate through two consecutive alkaline digestion reactions. The rosette zircon concentration in the Abu Khashaba area consists mainly of zircon and monazite minerals. Using different operating conditions, the hydrothermal digestion by autoclave and the conventional alkaline fusion methods was performed upon the non-magnetic concentrate of rosette in order to complete the removal of monazite firstly and to complete the purification of zircon metal secondly. All monazite content and undesirable impurities were removed by the hydrothermal method using optimal digestion conditions such as 4 mol/L NaOH solutions, 1/6 solid to liquid, 2 h dissolving time, and a temperature of 423 K. The residual zircon (84% Zr) was subjected to complete digestion using NaOH with a zircon-to-alkali ratio of 1/1.5 and a fusion temperature of 923 K. ZrO2-NPs were synthesized using the hydrothermal technique at 473 K for 7 h. The calcined ZrO2-NPs were characterized by X-ray diffraction, scan electron microscope, and transmittance electron microscope. Purified silica was also obtained as a by-product from washing solutions of fused zircon.

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Section: Heavy Fraction Preparation and Characterizationmentioning

confidence: 99%