§218.109. 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 218.112 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 218.112) or by the following equation:

 

 

where:

 

Pvol	=	Total vapor pressure of the mixture;
n	=	Number of components in the mixture;
i	=	Subscript denoting an individual component;
Pi	=	Vapor pressure of a component determined in accordance with subsection (a) of this Section;
Xi	=	Mole fraction of the component in the total mixture.

 

(Source:  Amended at 17 Ill. Reg. 16636, effective September 27, 1993)