Document YG6X2bqmYwNdgmvbZgKbq67yD

HSMOMjmtM m rm mn ow vwmwm* imp M Braden Copper Company The use of tetraethyl lead for purpose other than an a sotor fuel might net* at first thou&xt* he ragsrtled as a matter of consequence to Hfchyl Caroline Corporation* As a matter of fast# however* such usage under1 improper or hazardous conditions* or in stioh a manner as to result in oases of poisoning oannot fail to react unfavorably upon the business of Kthyl Caroline Corporation* and also upon Its reputation and good will* if the oona.itl.ons resulting in the misuse of the product were known and subscribed to by the Corporation. Accord* Ingly it becomes necessary to scrutinise carefully, from an hygienic viewpoint* the moans and purposes concerned In the use of 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 arc justified by the technologies! advantages which are an** tlcipated. X. Toxicological Considerations* A* The admixture of tetraethyl lead with a solvent* such m kerosene or Diesel oil* indnocs risks which obviously would require handling by moans similar in principle and In detail to those employed In mixing Fthyl Fluid with gasoline. Details of necessary Instructions and precautions are available elsewhere (See Regulations of Hodiocl Department) and need not be dieeuqsed hors* Proper precautions could, of course, be taken but It would be encuabeat upon the !ithyl aasoline Oosporatian to ace that they were actually and affectively used, If tbs saterlal were mad available on its responsibility* B. The handling of a solution of tetraethyl lend in oil, or other solvents* involves two definite risks which vary in msgnitud# with the concentration of the solution* namely * lead absorption though the akin m the result of contact, ami lead absorption by inhalation of vapors rising from the solution*. Concentrations of 10 to -.v. 30 v. of tetraethyl lead in such a solvent will provide serious hazards which are entirely uncontrollable except as the solution be handled In &n entirely closed system, and one which would not require br@ak~dCRm and repair*. Skin contact with auoh material would be prohibitively dangoyou** end the 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 g&solina were reached* Certainly no concentration higher than 0*1 should be 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 bo assumed that an oil containing from 35 to $0 cc of tetraethyl suM-fn loadAoan be safely handled. This solution la from S to l6 times as concentrated on the highest permitted in automobile R 0009342 3 fu&la, Safety .in the nee of such & solution would depend entirely upon the Mines* of ite handling sad use* It is apparent# therefore* ..that the detail# of the presented us of the imterial are required before any basis 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* Xn 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 intreduced into the pulp? <3* Waat routine and- inescapable precautions can be and will be imposed to provide protection against exposure by (Min contact and Inhalation* as the solution is conveyed from the container into the pulp* and as carrying lines* pumps* and tanks 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 does the tetraethyl load go? Is It found in the filter press? In the tailings? In the wash water? Or to some degree in all? If so* to what degree? KF 0009D43  . f* $9 what &tent are vortem exposed to those - different products at the process? < &* fcfh&fc i the final disposition of the tetraethyl load? posed thereby to inorg&nio lead ooopounde? $te* it go into a so&laent lake or settling basin! tt so* wh&t opportunity Odists for it to oolloot in considerable astounb in a pise froa which it will eventually be restored by workmn in cleaning up wastes? Does it go directly with waste water to a. lab or stream* and. if so to what use is this water supply put* and wh&t is tb eventually anticipated con-* eontration of lend in such tmter supply? 3* Beeomondatl on It .is suggested that a detailed description such finest ions aight well bo submitted to the Medical Poparts sent for further consideration and advice* K" 0009944