Abstract: One of the oldest procedures for the determination of zirconium and hafnium is based upon precipitation as phosphate from dilute sulfuric acid solution. Zirconium and hafnium are difficult to determine by atomic absorption spectroscopy (AAS); the sensitivity is poor, matrix effect is considerable, and there is serious interelement effects. This technique cannot as yet be recommended for application to silicate rocks. This chapter discusses the spectrophotometric determination of total zirconium and hafnium. This procedure is based upon the use of xylenol orange. This reagent is yellow in color and forms a red-color complex with zirconium, with a maximum absorption at a wavelength of 535 nm. In comparison to zirconium, hafnium is present to a smaller extent in silicate rocks. Chemical methods, including spectrophotometry, have not been successfully applied to the determination of hafnium in silicate rocks. For the determination of hafnium, emission spectrography, X-ray spectrography, and neutron activation analysis are commonly employed.
Publication Year: 1981
Publication Date: 1981-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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