Abstract
The adsorption property of coal humic acid extracted from oxidized coal has been investigated in a batch system using test liquids containing 137Cs-137Ba, 89Sr and 60Co. The coal humic acid oppears to have a grophite-like structure in which the aromatic nucleous is dominant. The performance of coal humic acid as ion exchanger is appreciably improved by changing it into Na-form by pre-treatment with NaCI solution. The distribution coefficients are higher for 89Sr and 60Co than for 137Cs-137Ba and take satisfactorily high values in the pH range between 4 and 7. The distribution coefficients decrease with increasing competing Na or Ca ion concentration; in the presence of Ca ions of considerably high concentration, the distribution coefficient is higher for 137Cs-137Ba than for 89Sr and 60Co.
