Influence of the moisture content on supercritical fluid extraction and Soxhlet extraction of dioxins from soil

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

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Other Title
  • 土壌中ダイオキシン類の超臨界流体二酸化炭素及びソックスレー抽出法における水分の影響
  • ドジョウ チュウ ダイオキシンルイ ノ チョウリンカイ リュウタイ 2サンカタンソ オヨビ ソックスレー チュウシュツホウ ニ オケル スイブン ノ エイキョウ

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Description

Supercritical fluid extraction (SFE) with CO2 was applied to an analysis of Polychlorinated dibenzo-p-dioxins/Polychlorinated dibenzofurans (PCDD/DFs) in paddy soil. At a constant pressure of 30 MPa and a temperature of 70°C, elevating the moisture content in soil from 1.6% to 9.8%, resulted in enhancing the extraction efficiency of PCDD/DFs. In particular, the tendency was remarkable for highly chlorinated congeners of PCDD/DFs. A similar increase in the extraction efficiency was also found in Soxhlet extraction. These results indicate that moisture content in soil affected the extraction efficiency of PCDD/DFs with SFE and Soxhlet extraction. This was considered to be due to changing the adsorption form of PCDD/DFs in soil and/or playing a role as a modifier on the SFE, contributing to the extraction of PCDD/DFs from the soil.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 52 (11), 989-995, 2003

    The Japan Society for Analytical Chemistry

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