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January 1, 1943

Determination of active oxygen in the presence of barium and lead

The method of Mrgudich and Clark is modified by substituting 5 per cent (by volume) perchloric acid for 50 per cent perchloric acid. Titration by potassium permanganate may be substituted for electrometric titration with ceric sulfate.

Authors

M. Fleischer

January 1, 1943

Determination of iron: In the presence of chromium and titanium with the jones reductor

Sulfuric acid solutions of titanous and chromous sulfates, obtained by passage through the Jones reductor, are oxidized by aeration for from 5 to 10 minutes in the presence of a trace of copper sulfate as a catalyst. Ferrous sulfate is essentially unoxidized and is titrated with permanganate after aeration. Best results are obtained by using 0.0003 millimole of copper sulfate in about 300 ml. of s

Authors

F. S. Grimaldi, R. E. Stevens, M. K. Carron

January 1, 1943

Determination of small amounts of molybdenum in tungsten and molybdenum ores

A rapid method has been developed for the determination of small amounts of molybdenum in tungsten and molybdenum ores. After removing iron and other major constituents the molybdenum thiocyanate color is developed in water-acetone solutions, using ammonium citrate to eliminate the interference of tungsten. Comparison is made by titrating a blank with a standard molybdenum solution. Aliquots are a

Authors

F. S. Grimaldi, R. C. Wells

January 1, 1943