LEAD OXIDE 137 



SECTION IV. 



Plumbum, Argentum, Zincum, Cuprum and Bismuthum. 

 Plumbum. 



(Lead is not used in the metallic state in veterinary medicine, except as a 



last resort.) 

 Plumbi Oxidum. Lead Oxide. PbO. (U. S. & B. P.) 



Synonym. — Litharge, E. ; lithargyrum, P. G. ; protoxide de plomb, Fr. ; blei- 

 glatte, G. 



Derivation. — Made by roasting lead in the air. 



Properties. — A heavy, yellowish or reddish-yellow powder, or in minute scales, 

 without odor or taste. On exposure to the air it slowly absorbs moisture and 

 carbon dioxide. Almost insoluble in water; insoluble in alcohol. Reaction faintly 

 alkaline. Lead oxide is valuable only for its preparations. 



PREPAnATION. 



Emplastrum Plumbi. Lead Plaster. (U. S. & B. P.) 

 (Diachylon Plaster.) 



Lead oxide, olive oil and lard, each 1000, boiling water, a sufficient quantity. 

 Basis of other preparations. 



Plumbi Acetas. Lead acetate. Pb(aHA)2+3 H^O. (U. S. & B..P.) 



Synonym. — Sugar of lead, E.; acetate de plomb, sel (sucre) de saturne, Fr. ; 

 assigsaures bleioxyd, bleizucker, G. ; plumbum aceticum, P. G. 



Derivation. — Heat lead oxide in acetic acid and water. 



PbO+2 HC^HjOj+a H20=Pb(C2H802)2+3 H^O. Lead acetate crystallizes 

 on cooling. 



Properties. — Colorless, shining, transparent, monoclinic prisms or plates, or 

 heavy, white crystalline masses, or granular crystals, having a faintly acetous 

 odor and a sweetish, astringent, afterwards metallic taste. Efflorescent and ab- 

 sorbing carbon dioxide on exposure to the air. Soluble in 1.4 parts of water and 

 in 38 parts of alcohol. Reaction slightly acid. 



Incompatibles. — Hard water, alkalies, mineral acids and salts, potassium 

 iodide, opium, vegetable astringents and albuminous liquids. 



Dose.—H. & C, 3i, (4) ; Sh. & Sw., gr.xv-xx, (1-1.3) ; D., gr.i-ii, (.06-.12). 



PREPAEATIOXS. 



Made from lead acetate in which lead exists as the subacetate, PbjO 

 (CHaCOO)^. 



Liquor Plumbi Subacetatis. Solution of Lead gubacetate. (U. S. P.) 

 Liquor Plumbi Subacetatis Fortls. (B. P.) 

 Synonym. — Goulard's extract, acetum plumbi; plumbum hydrico-aceticum 

 solutum, E.; liquor plumbici subacetici, P. G. ; sous-acetate de plomb liquide, 

 extract de Goulard, vinaigre de plomb, Fr. ; bleiessig, G. 



Composition. — An aqueous solution of lead subacetate (approximately), PbjO 

 (CHsCOO)2, containing not less than 18 per cent, of Pb. 



Liquor Plumbi Subacetatis Dilutus. Diluted Solution of Lead Subacetate. 



(U. S. & B. P.) 

 Synonym. — Lead Water. Solution of lead subacetate, 40; water to make 1000. 

 Ceratum Plumbi Subacetatis. (Unguentum, B. P.) Cerate of Lead Subacetate. 

 Solution of lead subacetate, 20; camphor, 2; wool fat, 20; paraffin, 20; white 

 petrolatum, 38. (U. S. P. 1906.) 



Plumbi Cakboitas. Lead Carbonate. (PbC03)2 Pb(0H)2. B. P. 

 (Non-official U. S. P.) 

 Synonym. — White lead, E.; blanc de plomb ceruse, Fr.; bleiweiss, G.; cerus- 

 sa, P. G. 



4 Pb+2 HCjH80,+2 02-^2 CO,= (PbCo3). Pb (OH)2-hPb(C2Hs02)2. 

 Properties. — A heavy, white, opaque powder, or a pulverulent mass, without 



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