Entrainer Effect of Water on Supercritical Carbon Dioxide Extraction for Dioxins in Soils

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  • MIYAWAKI Takashi
    Enviromental Science for Industry, Faculty of Agriculture, Ehime University
  • KAWASHIMA Ayato
    Enviromental Science for Industry, Faculty of Agriculture, Ehime University
  • HONDA Katsuhisa
    Enviromental Science for Industry, Faculty of Agriculture, Ehime University

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Other Title
  • 超臨界二酸化炭素を用いる土壌中ダイオキシン類抽出における水のエントレーナー効果
  • チョウリンカイ 2サンカタンソ オ モチイル ドジョウ チュウ ダイオキシンルイ チュウシュツ ニ オケル ミズ ノ エントレーナー コウカ

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Description

The effect of water as an entrainer was studied on supercritical carbon dioxide extraction (SCE-CO2) of Polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/DFs) in paddy soil. Using water as an entrainer elevated the extraction efficiency of PCDD/DFs, and it’s optimal extraction condition was as follows: a water flow velocity of 0.04 ml/min (2% versus CO2 flow velocity); 30∼40 MPa, 130∼190°C; 50 min dynamic SCE-CO2. The extraction efficiency of PCDD/DFs by 2% water entrainer was almost the same as those by 10% toluene- and 5% methanol-entrainers, and corresponded to about 80% of those by the conventional method (Soxhlet extraction). These results indicate that SCE-CO2 with water as an entrainer is rapid and organic-solvent less technique for the extraction of PCDD/DFs in soils.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (1), 43-49, 2005

    The Japan Society for Analytical Chemistry

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