obtained by using the cupferron method described earlier for total oxides. The proper volume was then calculated to transfer exactly 23.58 mg. of mixed oxides to a 100-ml. volumetric flask. These volumes were measured with a buret. A 10.00-ml. aliquot was taken and the color developed in a 25-ml. volumetric flask, exactly as described under the standardization procedure. Typical data for such a series are tabulated in Table V. The average deviation for the zirconium oxide results given is ±0.5%, which compares favorably with gravimetric results.
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