In these studies, lead was about equally^ toxic when administered as the acetate, phosphate, oxide, carbonate, and even as dried flakes of paint; Only in the case of metallic lead and lead sulfide was the lethality of lead noticeably less.

Primary and secondary lead smelters produce mainly oxides of lead while the burning of gasoline containing lead antiknock agents produces complex lead halogen salts.

Project Manager, kvr Quality Criteria for Lead TEH 0411217 DUP050451808 EPA-600/8-83/028aF June 1986 Air Quality Criteria for Lead Volume I of IV U.S.

(e) "Lead Pigment", as used herein is de fined to mean basic carbonate white lead (dry or in oil), basic lead sulphate (dry or in oil), litharge, red lead (dry or in oil), orange mineral or any other lead oxides, with or without metallic lead content.

Since blood lead readily crosses the placenta, lead poses a substantial threat to the developing fetus.

Over a wide range of lead ingestion, urinary lead excretion remains constant, although renal lead content Increases.

INTESTINAL ABSORPTION OF LEAD L.8.

-/3 Product Lead pipe Lead trapa and benda Solder Calking lead Tent pipe roof flashinga Sieet lead ahower pans Lead abutted cable Letter-preea proceii froia lead type Bard lead abeet Terne plate Calking lead Lead-Glased tile pipe Lead-idd batterlea Leaded ateels Lead-ubeatoa pads Calking lead Lead pipe Solder - -t 4 5. *5sr u^n.1 .u.WJ ijjmuuj la.JWRuajJU' 'anjniia i jijp^ a "MU"!

-/3 Product Lead pipe Lead trapa and benda Solder Calking lead Tent pipe roof flashinga Sieet lead ahower pans Lead abutted cable Letter-preea proceii froia lead type Bard lead abeet Terne plate Calking lead Lead-Glased tile pipe Lead-idd batterlea Leaded ateels Lead-ubeatoa pads Calking lead Lead pipe Solder - -t 4 5. *5sr u^n.1 .u.WJ ijjmuuj la.JWRuajJU' 'anjniia i j ij p^ a "MU"!

DuPont AELs of 50 (ig of lead/dL of blood and 50 jig/m3 (8-hour TWA with skin notation) have been established to protect against potential toxic effects of lead and lead compounds, and lead chromate and lead naphthenate, respectively.

Nevertheless the con ditions of life on an earth consisting part TABLE II Lead Excretion JF ly of lead and in an environment in which lead is used for many purposes, presup pose some degree of lead absorption on the part of everyone.

DOSE-RESPONSE RELATIONSHIP FOR LEAD J.

However, many of these studies do not reliably allow precise definition of lead-induced toxicity with lead exposure (as measured by bipod-lead levels).

<Lead in the Nature Environment First Draft - Charles Malone \ FKIVllEZED Introduction This discussion of lead in the < not under the direct influence of ma

LEAD AND REPRODUCTION 551 Symposium on Environmental Health Aspects of Lead.