緑茶の粒子表面での水銀(II)イオンの吸着 : 緑茶を吸着剤とする水中の微量水銀(II)イオンの捕集除去(<特集>超微量分析のための前処理と予備濃縮)

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書誌事項

タイトル別名
  • Mercury(II) ion adsorption on surface of green-tea particles; Collection and removal of micro amounts of mercury(II) ion in water by using the tea adsorbent.
  • 緑茶の粒子表面での水銀（ＩＩ）イオンの吸着　　緑茶を吸着剤とする水中の微量水銀（ＩＩ）イオンの捕集除去
  • リョクチャ ノ リュウシ ヒョウメン デ ノ スイギン 2 イオン ノ キュウ
  • Collection and removal of micro amounts of mercury (II) ion in water by using the tea adsorbent
  • 緑茶を吸着剤とする水中の微量水銀(II)イオンの捕集除去

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抄録

The adsorption properties of mercury(II) ion on surface of the Japanese green-tea (powder tea) particles were examined by the measurements of the adsorption percentage and the adsorption isotherm under various conditions, and a method to collect and remove the micro-amounts of mercury (II) ion in aqueous solutions is described. The powder tea was treated with formaline in a dilute sulfuric acid. A 100 ml sample solution containing HgCl2 was mixed with 50 mg of the treated tea under stirring for a few min. The solution was then centrifuged and the concentrations of Hg(II) in the supernatant solution were determined with the flameless atomic absorption spectrometer. 5100 μg Hg(II) in a 100 ml solution at pH 39was adsorbed over 90% on 50 mg of the tea. The adsorption equilibrium constant (K) and the maximum adsorption amount in the Langmuir equation was determined at pH 39 to be 6.4 ×104 dm3 mol-1 and 53 mg g-1, respectively. These values were almost the same as the corresponding ones for the activated carbon adsorbent. It was found that 50 μg Hg(II) in a 100 ml solution containing 1030 g Zn(NO3)2· 6H2O was quantitatively adsorbed on 50 mg of the tea with K =1.8 × 105 dm3mol-1 and that the maximum adsorption amount decreased to 6 mg g-1. Addition of 8-hydroxyquinoline or 1, 10-phenanthroline did not change greatly the adsorbability. On the other hand, addition of EDTA (Na2[H2edta]) inhibited completely the Hg (II) adsorption on the treated tea. The tea can be reused over 4 times as the adsorbent, after the Hg(II) is washed away and desorbed well with hydrochloric acid of 6 mol dm-3.

収録刊行物

  • 分析化学

    分析化学 36 (11), 666-671, 1987

    公益社団法人 日本分析化学会

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