Abstract
The presence of about 10% zirconium (as oxide) in alumina samples obtained by the ignition of aluminum 8-quinolinolate (precipitated as a trace-element collector) greatly dereased the intensity of molybdenum emission when the alumina was analysed by means of a cathode-layer carbon arc. Retention of the molybdenum on the sample electrode was confirmed with radioactive molybdenum-99. A prominent crystalline residue on the cathode, identified as ZrC by x-ray powder diffraction, was probably responsible for the decreased emission. Thus, zirconium crucibles cannot be used for the sodium carbonate fusion of samples in a spectrochemical procedure for determining traces of molybdenum in soils and plants.
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