Y> I O rWBej r r O O o ; <THE RECOGNITION, MEASUREMENT AND CONTROL OF; OCCUPATIONAL LEAD EXPOSURE ^ j v- Recognition of Lead Exposure !

PIG LEAD.

THe subcommittee just a few months ago let it be known that it con sidered lead additives a serious problem.

X beliefs you know it takes approximately 100 -- 120 days for tlie lead biMklea to oorrods into lead carbonate. $ - Shows the operators unloading a stack.

Calingaert has stated, I am inclined to be very skeptical about any relationship of lead to the illness of Mrv-!

Moreover this matter 13 not an important problem at present* Obviously however* any regulations developed now in this field should avoid the use of the word "Ethyl Gasoline" since this is a patented name and therefore* will not apply to other gasolines containing lead tetraethyl.

NOTIFY THE LEAD OPERATOR FOR FURTHER INSTRUCTIONS. 6.

I do not, however, share his feeling that the man*s condition may be con sidered as due in all likelihood to the absorption of lead.

The well-doeuwanted eases involve inaastion of paint produced prior to World Mar SZ when eha asjor plgaonts used la foraulating paint wnra laad coapounda such as idiite lead and lithopono.

and thereby asking sure that intercurrent illnesses of another type might not be mistaken for lead .

In each ea*e of lead poisoning, George X.

Suggested Draft of Newa Letter For the past fifteen years the manufacture of lead tetraethyl has not been a source of great concern in relation to public or Industrial health* During that time manufacturing operations have been oarried out in only two states and under effective hygienic control* However* in the past month* as a consequence of attempts to manufacture lead tetraethyl without proper safe guards* the attention of the Public Health Service has been called to this problem* when several oases of poisoning were reported in connection with a plant that had been in continuous operation only two weeks.

With the dithisone method one may use small samples of urine and obtain quite accurate results* X do not know how much experience you have had with the various methods* but I think it is perhaps worth while to caution you against the use of methods which have not been very carefully checked against small known quantities of lead* I say this only because quite a large number of mis-leading results hove been published from laboratories In this country In which not too critically tested methods have been employed* Moreover the diagnostic interpretation which has been put on many of the results has often been unjustified* I think you will find a fairly adequate discussion of most of our problems in relation to tetraethyl lead and leaded gasolines In the book which I have sent you* I find that the most frequent cause of misunderstanding Is in relation to the handling of gasoline.

M., S/6/-+3 , is very high in its lead c o n t ^ i ^ ^ m ^ ^ i t h i n normal limits in respect to arsenic.

Bates, Secretary, National Lead Company, 111 Broadway, New York, N.