Document 2VbeNk9qpD43jQp6g1VaMZrR

m rm m n of v m m w m * imp Braden Copper Company The use of tetraethyl lead for purposes other than an a actor fuel might not* at first thought, . he regarded as a matter of consequence to Hthyl Qasollas Corporation* As a matter of foot* hoveror, such usage under "'improper or hazardous oonditions* or in stash a aanner as to result In oases of poisoning cannot fail to react unfavorably upon the business of Kthyl Gasoline Corporation, and also upon its reputation and good will, -" if the conditions resulting in the misuse of the product viere known and subscribed to by the Corporation. Accord-* Ingly it becomes -necessary to scrutinise carefully, from an hygienic viewpoint, the means and purposes concerned in the use at the material, to see, first, whether or not . there are uncontrollable dangers, second, whether or not the necessary precautions for safety are taken If such, are feasible, and, third, to determine whether or not the risks are justified by the technological advantages which arc an ticipated* 1* Toxicological Considerations* A* The admixture of tetraethyl lead with a solvent,, such m kerosene or Diesel oil, Induces risks which obviously would require handling by moans similar in principle and In detail to those employed In mixing i*thyl Fluid with gasoline* Details at necessary Instructions and precautions are available elsewhere (See Regulations of Hediecl Department) and need not be diecuced her* Proper precautions could, of course, be token but It w u M be eaetiabsnt upon the lithyl Gasoline Coloration to ace that they were actually and affectively used if tbs material were made available on its responsibility* B. Him handling of a solution of tetraethyl lend in oil, or other solvents involves two definite risks which vary in magnitude with the concentration of the solution, namely lead absorption through the akin m the result of contact, ami load absorption by inhalation of vapors rising from the solution*. Concentrations of 10 to -.v . 30 y' of tetraethyl lead in such a solvent will provide serious hasards which are entirely uncontrollable except as the solution be handled in an entirely closed system, and one which would not require break-down and repair*. Skin contact with such material would be prohibitively dangerous* and tho hasard from inhalation at leaks and other points of entrance and exit would be acutely grave, Lower concentrations would impose somewhat lesser risks but there is no reason to believe that these would bo reduced to negligible proportions until concentrations approaching those employed In commercial gasoline were reached* Certainly no concentration higher than 0*1 should b used under conditions that require or permit of skin contact with the solution, or with equipment (pumps, pipe lines etc) contaminated by the solution. It must not be assumed that on oil containing from 23 to pO cc of tetraethyl load^oan be safely handled, This solution is from g to l6 times as concentrated on the highest permitted in automobile 3 fu&la, Safety .in the nee of such & solution would depend entirely upon the Mines* of its handling end use* It 1 apparent# therefore* ..that the detail of the projected uste of the imterial are required before any basils for judgment a to the magnitude of the b&sftrOfr is provided*. 3, Practical Considerations* , . As a means of reaching a conclusion as to the feasibility of the proposed operation* from an hygienic - viewpoint* the following details should be investigated thoroughly* ' A, %n what typo of container is. the solution of tetraethyl load to be supplied to the purchaser# and what means will b employed to identify the product so as not to permit its inadvertent use for other purposes? 3 By what means la the container to be emptied and to have its contents Introduced Into the pulp? <3* Want routine and- ineco&pabXe precautions can be and will be imposed to provide protection against exposure by akin contact and Inhalation* m the solution is conveyed from the container into the pulp* and m carrying lines* pumps* and tartfta are repaired or otherwise maintained? `D. Wlmt is the eventual diluent of the oil solution in the flotation process? hater? 3* Into what portion of the flotation products docs the tetraethyl load go? Is It found in the filter press? In the tellInga? In the wash water? Or to come degree in al:?.? If so* 'to what degree? .- . f* $9 what e&test are vor t em ertxfcsed to those ' 6.1ftorent protsct o f th e proecs? _ . * Iflfeat io the fin a l d isp osit io n of th e tetraethyl load? io# It go. into the f u m a to be deeom posent thereby to inorg&riie lead ocwapoun^st feoe it go into a sediment lahe Or settling basini If so* that opportunity evicts for it to collect in considerable asteant in a place from which it vili eventually be removed by wor&ten in. cleaning up 'vastes? Does It go directly with waste wat er to a. lab or breast* and. if so to what use is this water . supply put* and wh&t is the eventually anticipated con-, centration of lead in such tmter supply? 3* Hecomend&tion It Is suggested that a datailed description such <iucations sight well bo submitted to the Medical Pepart~ sent for further oousidration tm advice.