土壌中低沸点有機塩素化合物測定のための超臨界流体抽出

Abstract

Soil and ground aquifer contamination caused by aliphatic volatile organochlorine compounds, such as trichloroethylene and tetrachloroethylene etc., has made it necessary to determine soil contents. An application method of supercritical fluid extraction was therefore developed to extract the compounds from contaminated soil matrices.The method for collecting extracted materials was investigated from the viewpoint of minimizing collection loss. The collection train composed of two impingers that contain n-hexane and 5 % n-decane and cooled by an ice bath with salt was enough to collect the major compounds targeted.The extractability of target compounds was found to mostly depend on temperatures. The extracted amounts at 150 °C increased with an increase in temperature from 50 °C. On the other hand, pressure and the addition of a modifier did not affect the extractability.