THE PURITY OF GLYCERIN. 33 



It should not give off an unpleasant ethereal odor nor a strong 

 fruity odor when warmed with alcohol and sulphuric acid. 



It should not develop more than a yellow color when mixed with 

 an equal volume of sulphuric acid and no disagreeable odor should be 

 evolved. 



When treated with silver nitrate and ammonium hydroxid, accord- 

 ing to Hager, no color, or at most only a yellow color, should develop. 



It should give no reaction for sulphates, chlorids, oxalates, or 

 metals. 



It should give no reaction for sugars. 



When diluted with an equal volume of water it should give no 

 reduction with Fehling's solution. 



It should not contain arsenic in excess of the limit prescribed in 

 the Pharmacopoeia. 



REFERENCES. 



GENERAL TESTS. 



ALLEN, A. H. Detection of glycerol. (In his Commercial organic analysis, 1905, 



Vol. II, pt. 1, p. 305.) 

 BULLEHEIMER, FRiEDRiCH. Ueber Kupfer-Alkali-Glycerinvcrbindungen. Ber. d. 



chem. Ges., 1898, 31 (2): 1453. 

 CASPARI, CHAS. Glycerin Satisfactory commercial conditions (abstract). Proc., 



Amer. Pharm. Assn., 1900, 48: 777. 

 GANE, E. H. Laboratory notes. American Druggist, 1900, 36: 4. 



Glycerin Examination of commercial samples (abstract). Proc., Amer. 

 Pharm. Assn., 1900, 48: 777. 



HENKEL, HUGO, and ROTH, A. W. Chemische und physikalische Methoden zur 

 Analyse verdiinnter rein wasseriger Glycerinlosungen. Zts. angew. Chem., 1905, 

 18 (2): 1936. 



Chemical and physical methods for the analysis of pure and dilute aqueous 

 solutions of glycerol. J. Chem. Soc. (Lond.) Abst., 1906, 90 (2): 129. 



JAFFE, B. Ueber die Vorschriften der neuen Pharmacopoe III fiir Glycerin. Chem. 



Ztg., 1890, 14 (2): 1493. 

 LEWKOWITSCH, J. I. Qualitative tests. (In his Chemical technology and analysis 



of oils, fats, and waxes, 1898, p. 787.) 

 REICHL, C. Tests for glycerin and also for woody fiber. J. Soc. Chem. Ind., 1883, 



2: 356. 



ROTH, A. W. See Henkel, Hugo. 



STRUVE, H. Notes on commercial glycerin. Analyst, 1900, 25: 214. 

 VAN DORSSEN, W. See Van Romburgh, Pieter. 

 VAN ROMBURGH, PIETER, and VAN DORSSEN, W. Action of ammonia and amines on 



the formic esters of glycols and glycerol. J. Chem. Soc. (Lond.) Abst., 1906, 90 



(1): 3. 

 WELMANS, P. Zur Untersuchung des Glycerins. Pharm. Ztg., 1894, 39: 774. 



- Zur Priifung des Glycerins. Pharm. Rund., 1895, 13: 17. 



- Test for glycerin (abstract). Proc., Amer. Pharm. Assn., 1895, 43: 1068. 

 WILL, H. Glycerin The ammoniacal silver test (abstract). Proc., Amer. Pharm. 



Assn., 1892, 40: 984. 



