Heavy metal removal, mathematical

Finally, Heithmar et al. [110] combined this concentration procedure with a coupled ICP/MS-technique to overcome matrix-caused interferences in the ICP/MS when environmental samples are investigated. These could be both of spectral nature [111] and of a physical-chemical nature [112]. While the former may be mathematically eliminated by introducing respective correction terms in the calibration function, physical-chemical interferences are best be removed by the above-described separation of the heavy metals to be analyzed from interfering alkali and alkaline-earth metal salts. 

Experiments were performed for the removal of Cr, Fe", and with Dowex XFS 4195.02 ion exchange resin at 25 C. A mathematical model for the removal of both Cr and from aqueous solutions in the presence of the resin was developed with the assumption that intraparticle diffusion is a controlling step for the adsorption of the heavy metal ions on the resin. The intraparticle diffusivities of Cr and Cu throuqh the resin were obtained to be 0.5 and 0.03 - 0.05 cnr/min, respectively. A series of experiments on the... 

Mathematical models for the removal of heavy metals from aqueous solutions and the regeneration of used Dowex XFS 4195.02 resin were developed under several assumptions. Intraparticle diffusion is assumed to be the controlling step for the removal of heavy metals from aqueous solutions (10). The reaction rate is assumed to be a controlling step for the regeneration of the loaded resin in conjunction with a mass balance of heavy metal ions in the batch reactor (11,12). 

A mathematical model on the removal of heavy metals from aqueous solutions in the presence of Dowex XFS 4195.02 resin was developed, as shown in Equation 1. 

---