This paper describes the evaluation of a new personal sampler for organic vapors which is totally different from traditional sampling techniques using pumps and adsorption tubes. Sampling of organic vapors is effected by collection on an adsorption substrate contained within a small passive sampler worn by the worker. The collection element is removed from the sampler and subsequently analyzed for organic vapors. The results are equated with the time-weighted-average concentration of contaminants in air. This new sampling device circumvents inherent errors generally associated with sampling pumps and tubes; e.g., changes in pumping rates and variable pressure drops across adsorption tubes. Applications of the sampler were demonstrated on various concentrations of benzene, methyl isobutyl ketone, isooctane, butyl acetate, methyl chloroform, trichloroethylene, butanol and solvent mixtures. Variables studied included the effects of temperature, charcoal lot, and air velocities. In addition, the occurrence of "breakthrough" and effect of time on sample stability were investigated.

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America's day an average of 17 million barrels of petroleum is used in the ENergy United States to power or heat the nation's factories, businesses and homes, to produce gasoline and other fuels for transportation, and to manufacture a Bui .Iu Reserve todayhasaninven-tory of nearly 600 million barrels of crude oil. It represents an investment of nearly $20billion he in facilities and oil purchases. t Among the member nations of the Organization for Reserve EconomicCooperationand Development, the U.S. SPR accounts for nearly 60 percent of government owned or control-'led strategic stocks. Japan (with 206 million baioels) and Germany (with 53 million barrels) are the only other nations with large government owned oil reserves. Other nations require individual compaifies to hold stocks of crude oil or product equal to a specific number of days of consumption.Today the Re,rye can compensate for a total cutoff of crude oil imports into the U.S. for about 75 days. Considering :only oil imports from the Per-_!_ sian Gulf nations (prior to the August 1990 Iraqi invasion of Kuwait), the SPR represents nearly a 290-day supply of crude oil. Earl), HistoryPresident Ford set the SPR probn-am into motion when he signed the Energy Policy and Conservation Act (EPCA) on December 22, 1975. The legislation declared it to be U.S. policy to establish a reserve of up to 1 billion barrels of petroleum. Within four months after EPCA was enacted, the Federal Energy Administration (a predecessor of the Department of Energy) had prepared an early storage plan to ac'com-

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