Document jmDLZboxZRr4ZYbrmDmMaj1BZ

EVAPORATION OF LEAD ALKYLS - - -v - mm The studies summarized here were intended to provide eoma in- . y formation about the lead-in-alr levels that result when TML, TEL., or alkyl mixtures are handled in typical motor gasolines. Table 1 summarizes the data obtained in several sets of experi- ' \,V - ` ' \'r meat*. First are shown "Vapor over fuel" data which are a composite \`yi'y ,; .rss? - sy,# ` *& o: glassware and drum experiments and show the concentrations of Pb in the vapors above gasoline under equilibrium conditions. These values "llllare representative of those that would be obtained in the vapors displaced #iilas a partially filled tank or drum was refilled. AIN iodine solution was used to trap the leac alkyl vapors in tv "lead-in-air' bubbler and the lead was determined by the di this on a method. It can be noted that the relative mn lead concentrations were rougfdy proportional to vapor pressures. A single observation at San Bernardino of the lead in the vapor in a car tank confirms the TEL values obtained at Detroit very well. Measurements made of lead in air during automobile refueling i, . : ` ' :V ' . 6a- arc shown under ''Garage Sampling." Detroit and San Bernardino locations are shown along with the general conditions prevailing at the time the sampling was done. Tho number of cars refueled while each sample was taken is shown by the numbers in parenthesis. It will be , '*' v observed that the absolute values for TEL cover a wide range as does the ratio of lead from TML to lead from TEL. This variability simply emphasises the fact that a large number of observations during vehicle .refueling would b* required to establish the true levels of lecd-in-eir function of lead alkyl volatility. There i no reason to believe* h.,wov<r, that the ratios shown by the glassware and drum experiments are no; appr3r.in.&teiy correct* Harold J. Gib eon HJG/dl 1/12/59 HE 0020789 m* -* _ ^ V 'n/ ' '*V C5' J f<t3 t oft miM " i :! If *rK'i 2, H w oa * *: i s ** t w o* V* * * * O ft *-* O O' **<' O' O' N O N. Ift o c *- -J CO O' ft -4 i Os **** u. *4 fw. C* t'J i,nO ft > K& 0020790