Vapor Pressure of Volatile Organic Liquids

Section 219 Section 219.109   Vapor Pressure of Volatile Organic Liquids a)         If the VOL consists of only a single compound, the vapor pressure shall be determined by ASTM Method D2879-86 (incorporated by reference in Section 219.112 of this Part) or the vapor pressure may be obtained from a publication such as:  Boublik, T., V. Fried and E. Hala, "The Vapor Pressure of Pure Substances," Elsevier Scientific Publishing Co., New York (1973); Perry's  Chemical Engineer's Handbook, McGraw-Hill Book Company (1984); CRC Handbook of Chemistry and Physics, Chemical Rubber Publishing Company (1986-87); and Lange's Handbook of Chemistry, John A. Dean, editor, McGraw-Hill Book Company (1985). b)         If the VOL is a mixture, the vapor pressure shall be determined by ASTM Method D2879-86 (incorporated by reference in Section 219.112 of this Part) or by the following equation: where: P vol = Total vapor pressure of the mixture; n = Number of components in the mixture; i = Subscript denoting an individual component; P i = Vapor pressure of a component determined in accordance with subsection (a) of this Section; x i = Mole fraction of the component in the total mixture.