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Cobalt and nickel may be determined in the same solution by precipitating them as the complex salts as outlined above, determining the nickel by the dimethylglyoxime method and calculating the cobalt by difference. The reliability of the method was tested by mixing standard solutions of cobalt and nickel sulfates to make two solutions, then analyzing for both by the volumetric method and determining nickel by the dimethylglyoxime method and calculating cobalt by the difference. The results are given in Table III.An examination of the tables shows that this method gives excellent results for cobalt and nickel separately, and that results in the presence of each other compare reasonably well with accepted methods. The method is very rapid and requires no expensive apparatus, as does the method of Spacu for nickel.

As 5.1 cc. of carbon dioxide weigh 0.01 gram at normal temperature and pressure, we obtain Vi X 0.01 X 3 X 100 5.1 X 11 X wt. of sample % carbon in sample Cross and Bevan (1), after many experiments, applied the following correction factor which considers the amount of carbon dioxide dissolved in the acid: % carbon obtained 25

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