Pure lead p.ut uut lugl m price.

"Exposure" to lead includes the inhalation of airborne particulate and ingestion of lead or lead contaminated substances.

It is my understanding that you regard tetra ethyl lead poisoning as lead poisoning and that, in your opinion, there is no other substance in tetra ethyl lead other than the lead itself which pro duces poisoning.

** frsm LEAD INDUSTRIES ASSOCIATION 4M LttmaTOM AVSMUS mww von* i, m. .

RacGregor Coupany latlonal Lead Company St.

In any case, let me cite the evidence that relates to the lead hazard.

I maintain that white-lead is the only thing to stand the weather.

RacGregor Coupany latlonal Lead Company St.

I have never seen a case of lead poisoning that did not show stippling, except In a few instances which I have described in a series of cases of tetraethyl lead poisoning where the intoxication came on rapidly and was primarily a central nervous system 0011318 F.

* * frsm LEAD INDUSTRIES ASSOCIATION 4M LttmaTOM AVSMUS mw w von* i, m. .

Handling Tetraethyl Lead A .

The metal is essentially harmless Although it can be vaporized at high temperatures, such temperatures are not usually attained in cast ing, soldering, or heat treating baths Casting and soldenng pots should have local exhaust hoods to get nd of lead vapor or lead compounds which may be carried off with volatile fluxes It is at least equally important that the surface of the lead be kept free from dross and that the dross container be enclosed under the same hood so that dross can be removed from the pot and the container covered and removed, all under exhaust Likewise, on large soldenng jobs the solder ing operation should be locally exhausted, pnmarily to prevent nose and throat lmtation from acid fluxes More important, the fur naces used for heating the soldenng irons should be exhausted because m these furnaces considerable lead is mvanably oxidized Assembly of battery plates and buming-on of the connectors should be done on gnlle-top tables with down-draft ventilation This in stallation plus regular air sampling to ensure control of contamination, and physical ex aminations to keep tiack of lead absorption by employees, can eliminate lead poisoning from battery plants The poisoning produced by inhalation of solid inorganic lead compounds commonly causes symptoms of lead colic and lead ane mia Stipple cells or other readily stained cells in the circulating blood are good indi cators of lead absorption, although not so good as the direct measurement of lead con tent of the blood or urine Urinalyses for lead can now be run routinely and cheaply and with sufficient accuracy by polarographic or spectrographic methods Lead tetraethyl and other lead alkyls are likely to be much more rapidly progressive as poisons than the nonvolatile compounds and are much more likely to attack the nervous system than to produce gastrointestinal symp 1152 toms These effects are probably typical of the volatile lead compounds, none of which is common in industry Lethanes--see Thiocyanates (aliphatic).

It is my understanding that you regard tetra ethyl lead poisoning as lead poisoning and that, in your opinion, there is no other substance in tetra ethyl lead other than the lead itself which pro duces poisoning.

The experimental lead nephropathy was also similar to that found in patients with lead poisoning.

We are attempting to establish the upper level of the concentration of lead in the air, which when breathed by normal, healthy human subjects (who are ingesting lead with their food and beverages at the prevalent level of normal adult citizens in the U.S.a.) fails to induce an increase in the rate of their urinary excretion of lead, or in the concentration of lead in their blood.