lead (led)

A metallic element usually occurring native in the form of a sulphid (galena), le often in other combinations, and very rarely uncombined. Symbol, Pb. (from plumbum); atomic weight, 206.9. The compounds of 1. are poisonous, giving rise to lead colic, lead palsy, etc. It is a soft ductile metal of a bluish color. Upon exposure to the air only the surface is oxidized. In a compact ma it is not di olved by sulphuric or hydrochloric acid. It has a low melting point and is used in the preparation of alloys. List of poisons and their antidotes, see in appendix, page 939. black 1. Graphite. 1. acetate. A compound of 1. and acetic acid. The normal 1. acetate, or sugar of 1., is a body, Pb(C2H302)2+3H20, forming colorle , transparent prismatic crystals of sweet, astringent taste, soluble in water, slightly soluble in alcohol. Used as an astringent. [Lat., plumb i acetas, U. S. Ph., Br. Ph.] 1. and opium wash. See lotio plumb i et opii, under plumbum. 1. carbonate. Normal 1. carbonate, a body, PbCC>3, occurring native as the mineral cerusite, and also obtained artificially. What is usually called 1. carbonate is basic 1. carbonate. [Lat., plumb i carbon as, U. S. Ph., 1880, Br. Ph. 1898.] 1. iodid. A body, PbL, occurring as a heavy, bright-yellow crystalline powder, slightly soluble in water and in alcohol. Used topically as a discutient. [Lat., plumb i iodidum, U. S. Ph., Br. Ph.]. 1. line. The blue line on the gums in 1. poisoning. 1. lotion. A lotion containing a salt of lead, usually the subacetate. 1. nitrate. Plumbic nitrate, a body, Pb(NOs)2, of sweet astringent taste, readily soluble in water. It is used in solution as an astringent lotion, and internally in hemoptysis, epilepsy, and asthma. [Lat., plumb i nitras, U. S. Ph.]. 1. oleate. The lead salt of oleic acid, (Ci7H33.COO)2Pb. Used as an ointment. 1. oxid. Litharge or yellow oxid of lead and the red oxid are known. [Lat., plumb i oxidum, U. S. Ph., Br. Ph.] 1. poisoning. See /. cachexia, under cachexia; I. palsy, under palsy; leading, and plumbism. 1. subacetate. Basic 1. acetate, a term applied usually to the mixture of basic 1. acetates contained in the liquor plumb i sub a cet at is of the U. S. and Br. Ph's. sugar of 1. See under /. acetate and /. subacetate. [Ang.-Sax., loedj leading (led'ing). Of smelters, a chronic form of lead poisoning induced by their occupation.