Quest for a gasoline TLV

The major components in gasoline vapor generated during tank truck loading operations are identified. By analyzing 95 separate gasoline vapor samples, a mean Threshold Limit Value (TLV) for mixtures of about 300 ppm is calculated using 1976 TLV's for the individual hydrocarbons, if available. For compounds without an assigned TLV, a safe exposure value is estimated. Maximum levels of leaded gasoline additives tetraethyl/tetramethyllead, ethylene dibromide and ethylene dichloride are also estimated.