He was a refinery laborer who with several other laborers was detailed to help clean a tank which had been used for the storage of leaded gasoline.- We have previously called attention to the fact that the cleaning of these tanks involves lead exposure in that over a period of months or years variable quantities of decomposition products of the tetraethyl lead in the gasoline settle to the bottom of the tank* or adhere to the sides along with rust and. scale.

He was a refinery laborer who with several other laborers was detailed to help clean a tank which had been used for the storage of leaded gasoline.- We have previously called attention to the fact that the cleaning of these tanks involves lead exposure in that over a period of months or years variable quantities of decomposition products of the tetraethyl lead in the gasoline settle to the bottom of th tank* or adhere to the sides along with rust and. scale.

mixture, dry or liauid Tetraethyl lead, liauid Tetraethyl pyrophosphate, liauid Tetraethyl pyrophosphate, mixture - Tetramethyl lead Thallium - Eiallium salts, solid Thai1iurn sulfate, solid Thiocarbonyl-chloride Thionazin, Zinophos Thiophosgene o-Toluidine Trichloroethane Trichloroethylene VX Zinc arsenate Zinc arsenite, solid Zinc cyanide LAM 002616 DPMC-08755 60120.

We have come to recognize that pollutant lead levels on a world-wide scale are tens to thousands of times larger than natural lead levels, and that the route: ore lead, to tetraethyl lead, to atmosphere, to seas is of major importance.

Mr. jRlseo-Gill further informs me that lie has forwarded cer tain articleson the medical aspects of the handling of tetraethyl lead and leaded gasoline, as translated into Spanish.

I interviewed both doctor and patient and found that it was indeed another case of insipient lead encephalitis in a man operating another experi mental tetraethyl lead plant in one of the cities adjoining Denver.

Any tetraethyl lead which present would almost certainly he removed from the water by diatomaeeous earth.

Williams' article, in that Miss Conway's failure to mention "cases of lead poisoning which have resulted from tetraethyl lead in gasoline" is cited, presumably as an omission.

Williams* article, in that Miss Conway's' failure to mention "cases of lead poisoning which have resulted from tetraethyl lead in gasoline" is cited, presumably as an omission.

The. questions seemed to involve tetraethyl lead almost exclusively and no hesitancy seemed to exist regarding the wisdom of substituting tetramethyl lead for 'tetraethyl lead should it be considered advisable commercially.

On the other hand, I think the hogs can be regarded as quite safe from the viewpoint of percutaneous absorption of tetraethyl lead from any source* Cordially yours, iAM of gober u 'A * lienoe, H* D * H E 0014976

There is no significant quantity of tetraethyl lead to be dealt with at this stage of the work, provided the sludge has been removed completely.

.~| -r- I I ^ Spectrographic analysis for load of samples of urine from 4 men* Samples collected before exposure to lead tetraethyl and Immediately after cleaning a tetraethyl fluid tank, using special Ethyl Gasoline Corporation nen equipment at Standard Oil Company of Louisiana plant at Baton Rouge* Dr* Machle, Hame Mgs Pb/Ll ter Before Exposure o.o6 0,09 0.07- o.o8 Mgs Pb/Liter After Exposure 0*11 0*09 0.13 0.l4 Reported ; 4-10-19 HZ 0022301 \

It produces a clinical pioture of lead poisoning, which is different from that associated with any other lead compound, as you will see from the article describing the clinical tetraethyl lead poisoning.

We have studied this problem with a great deal of care, and perhaps I should point out briefly what seems to occur* Under the conditions of storage of leaded gasoline in tanka, there la a 3light decomposition of tetraethyl lead in the formation of organic lead compounds in the sludge at the bottom of the tank, which seem to be capable of reforming small quantities of tetraethyl lead.