Concentration of uranium(VI) on long-chain 8-quinolinol liquid membrane.

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  • AKIBA Kenichi
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • OHASHI Kousaburo
    Department of Chemistry, Faculty of Science, Ibaraki University

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Other Title
  • 長鎖８‐キノリノール液体膜によるウラン（ＶＩ）の濃縮
  • チョウサ 8 キノリノール エキタイ マク ニ ヨル ウラン 6 ノ ノウシュ
  • 長鎖8-キノリノール液体膜によるウラン(VI)の濃縮(<特集>超微量分析のための前処理と予備濃縮)

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Abstract

Extraction of U(VI) from weakly acidic media has been investigated by using alkyl derivatives of 8-quinolinol; 5-octyloxymethyl- (HO8Q ), 5-decyloxymethyl-(HO10Q) and 5-dioctylaminomethyl-8-quinolinol (HN8Q). The ability for the extraction of U increased in the order, HO10Q<HO8Q<HN8Q. Supported liquid membranes (SLM) containing these long-chain 8-quinolinols as a mobile carrier have been studied for their ability to transport and concentrate U from dilute solutions. Uranium was effectively transported by the HO8Q and HO10Q carriers from the feed solutions of pH around 5 into the stripping solution of dilute nitric acid against its concentration gradient. The concentration of U in the feed solution decreased as indicated by, ln ([U]f, t/[U] f, 0) = -kobst. Variation of carrier concentration and the feed pH gave a slight effect on kobs values. The recovery of U into the stripping solution attained 95% with the HO8Q carrier and 70% with the HN8Q carrier, leaving a small portion of U in the membrane layer. Approximately quantitative recovery of U was achieved by the HO10Q carrier; U was sufficiently concentrated from dilute solutions such as seawater spiked with 10-6 mol dm-3 U.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 36 (11), 707-711, 1987

    The Japan Society for Analytical Chemistry

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