STUDY OF THE INFLUENCE OF HUMIC SUBSTANCES ON THE SORPTION OF RARE EARTH ELEMENTS AT THE KAOLINITE AND BENTONITE SURFACES

摘要

The isotherms for sorption of fulvic acid from weathered coal,and the distribution ratios,Rd,of 169Yb at various concentration of fulvic acid on Na-bentonite and Na-Kaolinite have been measured.Meantime,the dependences of Rd of 169 Yb on pH values at a constant initial concentration of FA were obtained.It was not found that the parallel relationship between the high affinity of humic substance to the clay and the high uptake of metal which has strong ability to complex with this humic substance.