Mondal, Jayanta Kumar and Roy, S K (1992) Spectrophotometric method for the determination of hafnium and aluminum in zirconia and zircon sand after separation of zirconium with tri-normal-butyl phosphate. Glass Technology, 33 (3). pp. 98-102. ISSN 0017-1050

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Zirconium and iron were extracted with tri-n-butyl phosphate (20% in kerosene) at 10 N nitric acid solution and hafnium was determined directly at 0.1 N nitric acid with xylenol orange. Aluminium was established indirectly after obtaining the combined value for Al + Hf at pH 5.3 in presence of tartaric acid (2.7 x 10(-4) M) using the same indicator and by subtracting the hafnium. The effect of titanium was eliminated by adding H2O2 and ageing the solution for 3 h. The lowest value that could be obtained for HfO2 was 50 ng/ml and for Al2O3 40 ng/ml using a 1 cm cell. The method has been applied to the determination of HfO2 and Al2O3 in synthetic solutions as well as in zirconia and zircon samples.

Item Type: Article
Subjects: Microstructure and Characterization
Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 28 Nov 2013 07:19
Last Modified: 28 Nov 2013 07:19

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