Polarographic determination of traces of zirconium in ores by use of complex-forming compounds adsorbable at the dropping mercury electrode.
A polarographic method is proposed for the determination of trace zirconium down to the 5 x 10(-9)M level, based on the adsorption of the complex of zirconium with oxalic acid + cupferron + diphenylguanidine at the dropping mercury electrode in sodium acetate-acetic acid solution (pH 5.7). Under optimum conditions the wave-height is proportional to the concentration of zirconium in the range from 0 to 0.4 mug ml . The serious interference from titanium(IV) can be effectively eliminated by solvent extraction with 3% tri-n-octylamine from lN sulphuric acid and stripping with 0.1 M perchloric acid-lM hydrochloric acid-2M nitric acid mixture. The mechanism giving rise to the wave for the zirconium complex has been investigated. The method has been applied to the determination of trace zirconium in ores and ceramics.
Hua-Li
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Y
Research Laboratory of Hunan Bureau of Geology, People's Republic of China.
You-Hua
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H