February, 1935
INDUSTRIAL AND ENGINEERING CHEMISTRY
Moreover, since the lower ignition temperature is always associated with the more contracted period of induction, as is noticeable from Figure 7 , it is clear that the catalyst is promoting the slow oxidation preceding the combustion. Also the fact that added catalyst has practically nothing to do with the combustion velocity can be attributed to the same cause as was given for the similar phenomenon in the case of charcoal. I n addition, the data on the ash content in Table I show that the added catalysts are retained in the carbon almost in their original form u p to the final stage of combustion.
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This perhaps renders untenable the idea attributing the catalysis involved to the metallic vapor from the salt added.
LITERATURE CITED (1) Oshima, Y . , and Fukuda, I-., J . SOC.Chem. Ind. Japan, 34, 238-40B (1931); Fuel, 11, 135 (1932). (2) Oshima, Y., and Fukuda, Y . . 3. SOC.Chem. Ind. Japan, 35, 199B (1932) ; 37,184B (1934). (3) Ibid., 36, 246B (1933). RSCEIVXD September 29, 1534. Presented before the Division of Gas and Fuel Chemistry a t the 88th Meeting of the American Chemical Society, Cleveland, Ohio, September 10 to 14, 1934.
Removal of Copper Ions from Water by Sodium Aluminate C. J. BROCKMAN, University of Georgia, Athens, Ga.
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REVIOUS papers were concerned with the removal of copper ions from water by means of the alum floc ( 2 ) and by the ferric floc (1) under circumstances of p H control such as are met in municipal water treatment p l a n k Copper sulfate is added in many instances t o control the growth of algae which impart unpleasant tastri and odora to the water. I n the case of the alum floc it is possible to remove considerable quantities of copper as the sulfate in the treatment process, provided the filtered water possesses a pH of 6.3 or above. The pH range is somewhat larger in the case of the ferric floc, the lower value being 3.8 for 100 per cent removal. I n each case the copper salt is removed, posaibly as a n insoluble basic sulfate, a t a pH of 7.0 and above without the addition of any coagulating agent. I n continuing this work it was of interest to study the effect which the use of the
