The Construction and Testing of a New Apparatus with Knudsen Effusion Method Designed for Low Vapor Pressure Measurements of POPs

摘要

A new apparatus with Knudsen effusion method especially designed for the vapor pressure measurements of dioxin congeners and other POPs is described. Crystalline benzoic acid was used to test the new designed apparatus. The vapor pressure and enthalpy results of the reference compound were found in good agreement with accepted literature data, even when using a small Knudsen cell for toxicity compounds in this study.