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The adsorption kinetics of Pb2+ on different soils and minerals with variable charges was studied by the two ion-selective electrode technique at different pH and concentrations. The results showed that more than 95% of adsorption on all the samples occurred during the first 5 minutes. All adsorption time-dependent data could fit the surface second-order equation very well. The values of Xm were goethite > kaolinite, and latosol > red soil at the same initial reaction concentration. The values of k were kaolinite > > goethite, and latosol > red soil at the same reaction pH and initial concentration. The higher the suspension pH, the faster the adsorption occurred. The meaning of Xm got by the two ion-selective electrode technique (one kind of batch technique) was different from that by the miscible displacement technique in that the former was only the equilibrium adsorption amount at a definite concentration and pH, but the latter was almost equal to the adsorption capacity at a definite pH with much l
The adsorption kinetics of Pb2 + on different soils and minerals with variable charges was learned by the two ion-selective electrode technique at different pH and concentrations. The results showed that more than 95% of adsorption on all the samples occurred during the first 5 minutes. The values of k were kaolinite>> goethite, and latosol. All adsorption time-dependent data could fit the surface second-order equation very well. The values of Xm were goethite> kaolinite, and latosol> red soil at the same initial reaction concentration. > red soil at the same reaction pH and initial concentration. The higher the suspension pH, the faster the patrol occurs. The meaning of Xm got by the two ion-selective electrode technique (one kind of batch technique) was different from that by the the miscible displacement technique in that the former was only the equilibrium adsorption amount at a definite concentration and pH, but the latter was almost equal to the adsorption capacity at a defin ite pH with much l