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Hexachlorobenzene: Its Vapor Pressure and Vapor Phase Diffusion in Soil¹

ABSTRACT

The vapor pressure of hexachlorobenzene (HCB), measured with the gas saturation technique, was related to the temperature by the equation log₁₀p = 12.94 – (5279/T) giving HCB vapor pressure values from 0.420 x 10^–5 to 22.4 x 10^–5 mm Hg over the temperature range 15 to 45° C. The heat of vaporization of HCB was calculated to be 24.2 kcal/mol. The vapor pressure data was used to measure the vapor phase diffusion of HCB in soil using a vapor-diffusion cell. The steady-state vapor diffusion of HCB in soil was directly related to soil air-filled porosity and was therefore greatly reduced by increased soil bulk density and increased soil water content. The apparent steady-state HCB diffusion coefficient was linearly related to the soil porosity term, P_a^10/3 / P_T² where P_a is the soil air-filled porosity and P_T is the total soil porosity. The calculated diffusion coefficient in air for HCB was 1.0 x 10⁴ cm²/day.

¹ Contribution from the Dep. of Soil & Environmental Sciences, Univ. of California, Riverside, CA 92521, and the USDA-SEA — Federal Research. Presented before Div. S-1, Soil Sci. Soc. of Am., 29 Nov. 1976, Houston, Tex. This work has been supported by U.S. EPA, Contract no. 68-03-2014. Office of Research and Development.

² Associate Professor of Soil Science, Former Postgraduate Research Soil Scientist, Professor of Soil Physics, Univ. of California, Riverside, and Soil Scientist, USDA, Riverside, CA 92521. Present address of second author, Water Rights Division, State Water Resources Control Board, Sacramento, CA 95825.

Received for publication October 4, 1978. Accepted for publication March 14, 1980.