||Metal Interactions at Sulfide Mineral Surfaces. Part 2. Adsorption and Desorption of Lanthanum.
Lin, Y. ;
Bailey, G. W. ;
Lynch, A. T. ;
||Environmental Research Lab., Athens, GA. ;Academia Sinica, Beijing (China). ;Technology Applications, Inc., Athens, GA.
Sulfide minerals ;
Soil chemistry ;
Water pollution ;
Model tests ;
Path of pollutants
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Batch-type adsorption experiments with four sulfide minerals (chalcocite, galena, pyrite, and sphalerite) were used to investigate the adsorption and desorption behavior of lanthanum (III) in the presence of ethylenediaminetetraacetic acid (EDTA), a model humic substance. Linear adsorption was found in all cases. The presence of EDTA caused a 5- to 10-fold increase of La(III) adsorbed and also changed the order of adsorption of the four minerals. The presence of a soluble organic complexing ligand like EDTA should reduce the mobility of La(III) in porous media and its transport to groundwater in the percolating soil solution. Binding mechanisms are proposed to account for this preferential adsorption behavior.