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Alcoholic potash and soda
CURRENT
684
TOPICS.
[J. F. I.
Test for Methanol. HENRY LEFFMANN and CHARLES C. PINES (Am. J. Pharm., 1929, 101, 584-586) recommend the use of a solution of potassium guaiacolsulphonate in concentrated sulphuric acid as a reagent for the detection of formaldehyde and of methanol (methyl alcohol). Formaldehyde gives a pink color with this reagent; a few drops of the unknown are permitted to fall upon the reagent which is contained in a porcelain crucible. Methanol gives the reaction after its oxidation to formaldehyde according to the procedure of the current revision of the United States Pharmacopceia. When this test is applied for the detection of the presence of methanol in ethanol (ethyl alcohol), glycerol, if present, does not interfere with the test. J. S. H. Manganese and Copper in Animal Metabolism. Experiments conducted by R. W. TITUS and J. S. HUGHES (J. Biol. Chem., 1929, 83, 463-467) on young rats indicate that manganese and copper are stored in the animal body when their salts, in minute amounts, are added to the ration. The daily dose of manganese was 0.1 millegram, given as the chloride. The daily dose of copper was 0.05 When either manganese or copper millegram given as the sulphate. is either fed or stored, it is effective in the utilization of iron salts by the animal for the building of hemoglobin. J. S. H. A. G. MURRAY (J. Asso. Off. Agric. the solubility of sodium hydroxide and potassium hydroxide in methyl alcohol and ethyl alcohol. The alcohols were the ordinary laboratory reagents. The temperature was that of the room, approximately 28’ C. The saturated solution of sodium hydroxide in methyl alcohol contained 23.9 grams of solute per IOO cc. of solution, corresponding to 23.6 per cent. and to a normality of 5.98. The saturated solution of sodium hydroxide in ethyl alcohol contained 13.6 grams of solute per 100 cc., corresponding to 14.7 per cent. and to a normality of 3.40. The saturated solution of potassium hydroxide in methyl alcohol contained 40.03 grams of solute per IOO cc., corresponding to 35.5 per cent. and to a normality of 7.19. The saturated solution of potassium hydroxide in ethyl alcohol contained 29.0 grams of solute per 100 cc., corresponding to 27.9 per cent. and to a normality Of 5.17. J. S. H. Alcoholic
Potash
and Soda.
Chem., 1929, 12, 309) has determined
684
TOPICS.
[J. F. I.
Test for Methanol. HENRY LEFFMANN and CHARLES C. PINES (Am. J. Pharm., 1929, 101, 584-586) recommend the use of a solution of potassium guaiacolsulphonate in concentrated sulphuric acid as a reagent for the detection of formaldehyde and of methanol (methyl alcohol). Formaldehyde gives a pink color with this reagent; a few drops of the unknown are permitted to fall upon the reagent which is contained in a porcelain crucible. Methanol gives the reaction after its oxidation to formaldehyde according to the procedure of the current revision of the United States Pharmacopceia. When this test is applied for the detection of the presence of methanol in ethanol (ethyl alcohol), glycerol, if present, does not interfere with the test. J. S. H. Manganese and Copper in Animal Metabolism. Experiments conducted by R. W. TITUS and J. S. HUGHES (J. Biol. Chem., 1929, 83, 463-467) on young rats indicate that manganese and copper are stored in the animal body when their salts, in minute amounts, are added to the ration. The daily dose of manganese was 0.1 millegram, given as the chloride. The daily dose of copper was 0.05 When either manganese or copper millegram given as the sulphate. is either fed or stored, it is effective in the utilization of iron salts by the animal for the building of hemoglobin. J. S. H. A. G. MURRAY (J. Asso. Off. Agric. the solubility of sodium hydroxide and potassium hydroxide in methyl alcohol and ethyl alcohol. The alcohols were the ordinary laboratory reagents. The temperature was that of the room, approximately 28’ C. The saturated solution of sodium hydroxide in methyl alcohol contained 23.9 grams of solute per IOO cc. of solution, corresponding to 23.6 per cent. and to a normality of 5.98. The saturated solution of sodium hydroxide in ethyl alcohol contained 13.6 grams of solute per 100 cc., corresponding to 14.7 per cent. and to a normality of 3.40. The saturated solution of potassium hydroxide in methyl alcohol contained 40.03 grams of solute per IOO cc., corresponding to 35.5 per cent. and to a normality of 7.19. The saturated solution of potassium hydroxide in ethyl alcohol contained 29.0 grams of solute per 100 cc., corresponding to 27.9 per cent. and to a normality Of 5.17. J. S. H. Alcoholic
Potash
and Soda.
Chem., 1929, 12, 309) has determined