緑茶を吸着剤として用いる水中の各種重金属類の捕集除去法

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タイトル別名
  • Use of green tea as an adsorbent of several metal ions in water.
  • リョクチャ オ キュウチャクザイ ト シテ モチイル スイチュウ ノ カクシュ

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抄録

A method was described to collect the several metal ions in water with the Japanese green tea (powder tea). The tea powder was treated with formalin in a dilute sulfuric acid. A 100 ml solution containing Ag+, Cd2+, Co2+, Cu2+, Fe3+, Mn2+, Ni2+, Pb2+ and Zn2+ was mixed with 0.5 g of the tea under stirring for 30 min. The solution was then centrifuged or filtered through and the concentrations of metal ions in the filtrate were determined with a flameless atomic absorption spec trometer. The 8 metals but Fe3+ (0.4 11 ppm in total concentrations) are collected over 90% from the solution of 0.01 mol dm-3 sodium acetate at pH 6. The tea can be reused over several times as the ad sorbent, after the metals are washed away with 0.1 mol dm-3 HCl. Addition of 8-quinolinol or 1, 10-phenanthroline leads to the collection over 90% for all the ions including Fe3+. The effect of ethylenediaminetetraacetate, trans-1, 2-cyclohexanediaminetetraacetate, chloride, sulfate, oxalate, and L-ascorbate anions on the collection efficiency is also examined. Metal adsorbabilities are compared as well between green tea and activated carbon.

収録刊行物

  • 分析化学

    分析化学 35 (4), 400-405, 1986

    公益社団法人 日本分析化学会

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